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Philips SC28L91 - page 1
SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UAR T) Product data sheet Supersedes data of 2000 Sep 22 2004 Oct 21 INTEGRA TED CIRCUITS ...
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Philips SC28L91 - page 2
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2 2004 Oct 21 DESCRIPTION The SC28L91 is a new member of the IMP ACT family of Serial Communications Controllers. It is a single channel UART operating at 3.3 V and 5.0 V V CC , 8 or 16 byte FIFOs and is quite compatible with softwar ...
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Philips SC28L91 - page 3
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UAR T) 2004 Oct 21 3 ORDERING INORMA TION Industrial V CC = +3.3 V ± 10 %, +5 V ± 10 % Description T amb = –40 ° C to +85 ° C Drawing Number 44-Pin Plastic Leaded Chip Carrier (PLCC) SC28L91A1A SOT187-2 44-Pin Plastic Quad Flat Pack ...
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Philips SC28L91 - page 4
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UAR T) 2004 Oct 21 4 PIN CONFIGURA TION DIAGRAM 80XXX PIN CONFIGURA TION Pin Function 1A 3 2 IP0 3 WRN 4 RDN 5V CC 6 No Connection 7 OP1 8 OP3 9 OP5 10 OP7 1 1 I/M 12 D1 13 D3 14 D5 15 D7 Pin Function 16 GND 17 GND 18 INTRN 19 D6 20 D4 21 ...
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Philips SC28L91 - page 5
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UAR T) 2004 Oct 21 5 PIN CONFIGURA TION DIAGRAM 68XXX PIN CONFIGURA TION Pin Function 1A 3 2 IP0 3 R/WN 4 DACKN 5V CC 6 No Connection 7 OP1 8 OP3 9 OP5 10 OP7 1 1 I/M 12 D1 13 D3 14 D5 15 D7 Pin Function 16 GND 17 GND 18 INTRN 19 D6 20 D4 ...
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Philips SC28L91 - page 6
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UAR T) 2004 Oct 21 6 8 D0–D7 RDN WRN CEN A0–A3 RESET INTRN X1/CLK X2 4 BUS BUFFER OPERA TION CONTROL ADDRESS DECODE R/W CONTROL INTERRUPT CONTROL IMR ISR TIMING BAUD RA TE GENERA TOR CLOCK SELECTORS COUNTER/ TIMER XT AL OSC CSR ACR CTL ...
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Philips SC28L91 - page 7
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UAR T) 2004 Oct 21 7 8 D0–D7 R/WN CEN A0–A3 RESETN INTRN X1/CLK X2 4 BUS BUFFER OPERA TION CONTROL ADDRESS DECODE R/W CONTROL INTERRUPT CONTROL IMR ISR TIMING BAUD RA TE GENERA TOR CLOCK SELECTORS COUNTER/ TIMER XT AL OSC CSR ACR CTL D ...
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Philips SC28L91 - page 8
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UAR T) 2004 Oct 21 8 PIN CONFIGURA TION FOR 80XXX BUS INTERF ACE (INTEL ) Symbol Pin type Name and function I/M I Bus Configuration: When high or not connected configures the bus interface to the Conditions shown in this table. D0–D7 ...
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Philips SC28L91 - page 9
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UAR T) 2004 Oct 21 9 PIN CONFIGURA TION FOR 68XXX BUS INTERF ACE (MOTOROLA ) Symbol Pin type Name and function I/M I Bus Configuration : When low configures the bus interface to the Conditions shown in this table. D0–D7 I/O Data Bus ...
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Philips SC28L91 - page 10
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UAR T) 2004 Oct 21 10 ABSOLUTE MAXIMUM RA TINGS 1 Symbol Parameter Rating Unit T amb Operating ambient temperature range 2 Note 4 ° C T stg Storage temperature range –65 to +150 ° C V CC V oltage from V CC to GND 3 –0.5 to +7.0 V V S ...
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Philips SC28L91 - page 11
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 11 DC ELECTRICAL CHARACTERISTICS 1, 2, 3 V CC = 3.3 V ± 10 %, T amb = –40 ° C to +85 ° C, unless otherwise specified. Symbol Parameter Conditions Min Ty p Max Unit V IL Input low voltage 0.65 0.2*V CC V V IH Input hi ...
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Philips SC28L91 - page 12
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 12 AC CHARACTERISTICS (5 VOL T) 1, 2, 3, 4 V CC = 5.0 V ± 10 %, T amb = –40 ° C to +85 ° C, unless otherwise specified. Symbol Parameter Min Ty p Max Unit Reset Timing (See Figure 4) t RES Reset pulse width 100 18 ns ...
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Philips SC28L91 - page 13
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 13 Unit Max Ty p Min Parameter Symbol Receiver Timing, external clock (See Figure 13) t *RXS RxD data setup time to RxC high 50 40 ns t *RXH RxD data hold time from RxC high 50 40 ns 68000 or Motorola bus timing (See Figu ...
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Philips SC28L91 - page 14
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 14 AC CHARACTERISTICS (3.3 VOL T) 1, 2, 3, 4 V CC = 3.3 V ± 10 %, T amb = –40 ° C to +85 ° C, unless otherwise specified. Symbol Parameter Min Ty p Max Unit Reset Timing (See Figure 4) t RES Reset pulse width 100 20 ...
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Philips SC28L91 - page 15
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 15 Unit Max Ty p Min Parameter Symbol Receiver Timing, external clock (See Figure 13) t *RXS RxD data setup time to RxC high 50 10 ns t *RXH RxD data hold time from RxC high 50 10 ns 68000 or Motorola bus timing (See Figu ...
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Philips SC28L91 - page 16
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 16 Block Diagram The SC28L91 UART consists of the following seven major sections: data bus buffer , operation control, interrupt control, timing, Rx and Tx FIFO Buffers, input port and output port control. Refer to the Bl ...
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Philips SC28L91 - page 17
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 17 This continues regardless of issuance of the stop counter command. ISR[3] is reset by the stop counter command. NOTE: Reading of the CTU and CTL registers in the timer mode is not meaningful. When the C/T is used to ge ...
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Philips SC28L91 - page 18
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 18 “just missed” and the first change-of-state is not detected until 25 µ s later . Output Port The output ports are controlled from six places: the OPCR, OPR, MR, Command, SOPR and ROPR registers. The OPCR register ...
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Philips SC28L91 - page 19
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 19 in the status register is set whenever one or more characters are available to be read, and a FFULL status bit is set if all 8 or 16 stack positions are filled with data. Either of these bits can be selected to cause a ...
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Philips SC28L91 - page 20
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 20 latency is longer than the pause in the data stream.) In this case, when a new character has been received, the counter/timer will be restarted by the receiver , thereby withdrawing its interrupt. If, at this time, the ...
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Philips SC28L91 - page 21
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 21 Register Acronyms and Read / Write Capability (R/W = Read/Write, R = Read only , W = Write only) Mode Register MRn R/W Status Register SR R Clock Select CSR W Command Register CR W Receiver FIFO RxFIFO R T ransmitter F ...
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Philips SC28L91 - page 22
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 22 REGISTER DESCRIPTIONS MODE REGISTERS MR0 – Mode Register 0 Mode Register 0. MR0 is accessed by setting the MR pointer to 0 via the command register command B. Addr Bit 7 BIT 6 BITS 5:4 BIT 3 BIT 2 BIT 1 BIT 0 MR0 Rx ...
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Philips SC28L91 - page 23
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 23 MR1 – Mode Register 1 Addr BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 MR1 Rx CONTROLS RTS RxINT BIT 1 ERROR MODE P ARITY MODE P ARITY TYPE BITS PER CHARACTER 0x00 0 = No 1 = Y es 0 = RxRDY 1 = FFULL 0 = Char 1 = ...
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Philips SC28L91 - page 24
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 24 MR2 – Mode Register 2 MR2 is accessed when the MR pointer points to MR2, which occurs after any access to MR1. Accesses to MR2 do not change the pointer . ADDR BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 MR CHANN ...
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Philips SC28L91 - page 25
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 25 6. The last character will be transmitted and OPR[0] will be reset one bit time after the last stop bit, causing RTSN to be negated. MR2[4]— Clear-to-Send Control If this bit is 0, CTSN has no effect on the transmitt ...
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Philips SC28L91 - page 26
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 26 CSR CLOCK SELECT REGISTER Addr CSR (7:4) CSR (3:0) CSR RECEIVER CLOCK SELECT TRANSMITTER CLOCK SELECT 0x01 See T ext and table 5 See T ext and table 5 T able 5. Baud rate (base on a 3.6864MHz crystal clock) MR0[0] = 0 ...
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Philips SC28L91 - page 27
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 27 CR—Command Register CR is a register used to supply commands to the UART . Multiple commands can be specified in a single write to CR as long as the commands are non–conflicting, e.g., the ‘enable transmitter ’ ...
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Philips SC28L91 - page 28
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 28 SR Status Register Addr Bit 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 SR RECEIVED BREAK 1 FRAMING ERROR 1 P ARITY ERROR 1 OVERRUN ERROR TxEMT TxRDY FFULL RxRDY 0x01 0 = No 1 = Y es 0 = No 1 = Y es 0 = No 1 = Y es 0 = ...
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Philips SC28L91 - page 29
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 29 OPCR Output Port Configuration Register Addr Bit 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 OPCR OP7 OP6 OP5 OP4 OP3 OP2 OP1 OP0 0x0D 0 = OPR[7] 0 = OPR[6] 0 = OPR[5] 0 = OPR[4] 00 = OPR[3] 00 = OPR[2] 1 = Reserved 1 ...
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Philips SC28L91 - page 30
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 30 OPR Output Port Register The output pins (OP pins) drive the compliment of the data in this register as controlled by SOPR and ROPR. Addr Bit 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 N/A OP 7 OP 6 OP 5 OP 4 OP 3 OP ...
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Philips SC28L91 - page 31
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 31 ISR—Interrupt Status Register This register provides the status of all potential interrupt sources. The contents of this register are masked by the Interrupt Mask Register (IMR). If a bit in the ISR is a ‘1’ and ...
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Philips SC28L91 - page 32
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 32 CTPU and CTPL – Counter/Timer Registers CTPU Counter Timer Preset Upper CTPU Bit 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 0x06 The lower eight (8) bits for the 16 bit counter timer preset register CTPL Counter – ...
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Philips SC28L91 - page 33
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 33 RESETN t RES SD00696 RESETN t RES 80XXX Mode 68XXX Mode Figure 4. Reset Timing A0–A3 CEN t AS t CS t CH RDN t RW t RWD D0–D7 (READ) t DD t DF FLOA T FLOA T V ALID NOT V ALID WDN t RWD V ALID D0–D7 (WRITE) t DS t ...
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Philips SC28L91 - page 34
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 34 X1/CLK A1–A4 RWN CSN D0–D7 DT ACKN t CSC t AS t CS t DF t DA T t DAH t CH t RWD t DD t DCR t AH DA T A V ALID NOT V ALID t DA NOTE: DACKN low requires two rising edges of X1 clock after CSN is low . SD00687 Figure ...
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Philips SC28L91 - page 35
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 35 X1/CLK INTRN IACKN D0–D7 DT ACKN t CSC t DD t DF t CSD t DAL t DCR t DAH t DA T NOTE: DACKN low requires two rising edges of X1 clock after CSN is low . SD00149 Figure 8. Interrupt Cycle Timing (68XXX mode) (b) OUTPU ...
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Philips SC28L91 - page 36
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 36 NOTES: 1. INTRN or OP3-OP7 when used as interrupt outputs. 2. The test for open-drain outputs is intended to guarantee switching of the output transistor . Measurement of this response is referenced from the midpoint o ...
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Philips SC28L91 - page 37
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 37 t TXD t TCS 1 BIT TIME (1 OR 16 CLOCKS) TxD TxC (INPUT) TxC (1X OUTPUT) SD00138 Figure 12. T ransmitter External Clocks t RXS t RXH RxC (1X INPUT) RxD SD00139 Figure 13. Receiver External Clock TRANSMITTER ENABLED TxD ...
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Philips SC28L91 - page 38
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 38 D1 D2 D8 D9 D10 D11 D12 D13 RxD D12, D13 WILL BE LOST DUE TO RECEIVER DISABLE. RECEIVER ENABLED RxRDY (SR0) FFULL (SR1) RxRDY/ FFULL (OP5) 2 RDN ST A TUS DA T A D1 ST A TUS DA T A D2 ST A TUS DA T A D3 ST A TUS DA T A ...
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Philips SC28L91 - page 39
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 39 INTRN DACKN D0–D7 TxDA/B OP0–OP7 125pF +5V I = 2.4mA 125pF I = 2.4mA V OL return to V CC for a 0 level I = 400 µ A V OH return to V SS for a 1 level SD00690 Figure 17. T est Conditions on Outputs ...
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Philips SC28L91 - page 40
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 40 PLCC44: plastic leaded chip carrier; 44 leads SOT187-2 ...
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Philips SC28L91 - page 41
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 41 QFP44: plastic quad flat package; 44 leads (lead length 1.3 mm); body 10 x 10 x 1.75 mm SOT307-2 ...
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Philips SC28L91 - page 42
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 42 REVISION HIST OR Y Rev Date Description _3 20041021 Product data (9397 750 13124). Supersedes Product specification of 2000 Sep 22 (9397 750 07549). Modifications: • AC electrical characteristics (5 V) table: – t R ...
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Philips SC28L91 - page 43
Philips Semiconductors Product data sheet SC28L91 3.3 V or 5.0 V Universal Asynchronous Receiver/T ransmitter (UART) 2004 Oct 21 43 Definitions Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data hand ...
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