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INTEGRATED CIRCUITS
SCC2691
Universal asynchronous
receiver/transmitter (UART)
Product data sheet 2006 Aug 04
Supersedes data of 1998 Sep 04
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Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 DESCRIPTION PIN CONFIGURATIONS The Philips Semiconductors SCC2691 Universal Asynchronous Receiver/Transmitter (UART) is a single-chip CMOS-LSI RDN 1 24 V CC communications device that provides a full-duplex asynchronous 2 23 RxD WRN receiver/transmitter. It is fabricated with Philips Semiconductors CMOS technology which combines the benefits of high density and 3 22 TxD D0 low power consumption.
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Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 ORDERING INFORMATION COMMERCIAL INDUSTRIAL PACKAGES VERSION V = +5V +10%, V = +5V +10%, CC CC T = 0°C to +70°C T = –40°C to +85°C A A 24-Pin Plastic Dual In-Line Package (DIP) SCC2691AC1N24 SCC2691AE1N24 SOT222–1 28-Pin Plastic Leaded Chip Carrier (PLCC) Package SCC2691AC1A28 SCC2691AE1A28 SOT261-2 24-Pin Plastic Small Outline Large (SOL) Package SCC2691AC1D24 SOT137-1 BLOCK DIAGRAM INTERNAL DAT
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Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 PIN DESCRIPTION PIN NO. MNEMONIC MNEMONIC TYPE TYPE NAME NAME AND AND FUNCTION FUNCTION DIP PLCC D0–D7 22–15 27, 25, I Data Bus: Active-high 8-bit bidirectional 3-State data bus. Bit 0 is the LSB and bit 7 is the 24, MSB. All data, command, and status transfers between the CPU and the UART take place 22–18 over this bus. The direction of the transfer is controlled by the WRN and RDN inputs when t
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Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 1 ABSOLUTE MAXIMUM RATINGS SYMBOL PARAMETER RATING UNIT 2 T Operating ambient temperature range Note 4 °C A T Storage temperature range –65 to +150 °C STG 3 V Voltage from V to GND –0.5 to + 7.0 V CC CC 3 V Voltage from any pin to ground –0.5 to V +10% V S CC P Power Dissipation 300 mW D NOTES: 1. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device.
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Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 1, 2, 3, 4 AC ELECTRICAL CHARACTERISTICS LIMITS SYMBOL SYMBOL P PARAMETER ARAMETER UNIT UNIT Min Typ Max Reset timing (Figure 3) t Reset pulse width 100 ns RES 5 Bus timing (Figure 4) t A0–A2 setup time to RDN, WRN low 10 ns AS t A0–A2 hold time from RDN, WRN low 100 ns AH t CEN setup time to RDN, WRN low 0 ns CS t CEN hold time from RDN, WRN high 0 ns CH t WRN, RDN pulse width 150 ns RW t Dat
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Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 SCC2692, SCC68681 and SCC2698B” Philips Semiconductors ICs BLOCK DIAGRAM for Data Communications, IC-19, 1994. As shown in the block diagram, the UART consists of: data bus buffer, interrupt control, operation control, timing, receiver and transmitter. Mode registers 1 and 2 are accessed via an auxiliary pointer. The pointer is set to MR1 by RESET or by issuing a reset pointer Data Bus Buffer com
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Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 values of CTUR and CTLR at any time, but the new count becomes one-half of the bit period after the stop bit was sampled, then the effective only on the next start counter command following a stop receiver operates as if a new start bit transition had been detected at counter command. If new values have not been loaded, the previous that point(one-half bit time after the stop bit was sampled). co
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Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 In addition to the normal transmitter and receiver operation MULTI-PURPOSE OUTPUT PIN described above, the UART incorporates a special mode which This pin can be programmed to serve as a request-to-send output, provides automatic wake-up of the receiver through address frame the counter/timer output, the output for the 1X or 16X transmitter or recognition for multi-processor communications. This
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Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 parity mode is programmed. In the special wake-up mode, it selects immediately. An exception to this is switching out of auto-echo or the polarity of the transmitted A/D bit. remote loopback modes; if the deselection occurs just after the receiver has sampled the stop bit (indicated in auto-echo by MR1[1:0] – Bits Per Character Select assertion o fRxRDY), and the transmitter is enabled, the trans
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Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 Table 2. Register Bit Formats Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 MR1 (Mode Register 1) RxRTS Control RxINT Select Error Mode* Parity Mode Parity Type Bits per Character 0 = no 0 = RxRDY 0 = Char 00 = With parity 0 = Even 00 = 5 1 = yes 1 = FFULL 1 = Block 01 = Force parity 1 = Odd 01 = 6 10 = No parity 10 =
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Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 Table 2. Register Bit Formats (Continued) CTUR (Counter/Timer Upper Register) C/T[15] C/T[14] C/T[13] C/T[12] C/T[11] C/T[10] C/T[9] C/T[8] Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 CTLR (Counter/Timer Lower Register) C/T[7] C/T[6] C/T[5] C/T[4] C/T[3] C/T[2] C/T[1] C/T[0] 0011 Reset transmitter. Resets the transmitter as if a hardware reset
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Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 CR[1] – Disable Receiver SR[2] – Transmitter Ready (TxRDY) This command terminates operation of the receiver immediately; a This bit, when set, indicates that the THR is empty and ready to be character being received will be lost. The command has no effect on loaded with a character. This bit is cleared when the THR is loaded the receiver status bits or any other control registers. If the special
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Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 to placing the SCC2691 in this mode. Note that this bit must be set 011 The 16X clock for the transmitter. This is the clock selected to a logic 1 after reset. by CSR[3:0] = 1111. 100 The 1X clock for the receiver, which is the clock that samples When the power-down mode is enabled, internal circuitry forces the the received data. If data is not being received, a non-syn- X1/CLK pin to the low st
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Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 0.3/26.3 which is 1.14%; well within the ability asynchronous mode IMR – Interrupt Mask Register of operation. The programming of this register selects which bits in the ISR cause an interrupt output. If a bit in the ISR is a ‘1’ and the corresponding bit in If the value in CTUR or CTLR is changed, the current half-period will the IMR is a ‘1’, the INTRN output is asserted (low). If the correspon
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Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 RDN t t PS PH MPI WRN t PD MPO SD00125 Figure 5. I/O Timing V WRN M t IR V +0.5V 1 OL INTERRUPT OUTPUT V OL RDN t IR V +0.5V 1 OL INTERRUPT OUTPUT V OL NOTES: 1. INTRN or MPO 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 of the switching signal, V , to a
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Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 1 BIT TIME (1 OR 16 CLOCKS) TxC (INPUT) t TXD TxD t TCS TxC (1X OUTPUT) SD00092 Figure 8. Transmit Timing RxC (1X INPUT) t t RXS RXH RxD SD00093 Figure 9. Receive Timing 2006 Aug 04 17
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Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 TxD D1 D2 D3 BREAK D4 D6 TRANS- MITTER ENABLED TxRDY (SR2) WRN D1 D2 D3 START D4 STOP D5 WILL D6 BREAK NOT BE BREAK TRANSMITTED 1 CTSN (MPI) 2 RTSN (MPO) CR[7:4] = 1010 CR[7:4] = 1010 NOTES: 1. TIMING SHOWN FOR MR2[4] = 1. 2. TIMING SHOWN FOR MR2[5] = 1. SD00128 Figure 10. Transmitter Timing RxD D1 D2 D3 D4 D5 D6 D7 D8 RECEIVER ENABLED RxRDY (SR0) D2 FFULL (SR1) RxRDY/ FFULL 2 MPO RDN S = STAT
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Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 MASTER STATION BIT 9 BIT 9 BIT 9 ADD#1 1 D0 0 ADD#2 1 TxD TRANSMITTER ENABLED TxRDY (SR2) CSN (WRITE] MR1[2] = 1 ADD#2 MR1[4:3] = 11 ADD#1 MR1[2] = 0 D0 MR1[2] = 1 PERIPHERAL STATION BIT 9 BIT 9 BIT 9 BIT 9 BIT 9 RxD 0 ADD#1 1 D0 0 ADD#2 1 0 RECEIVER ENABLED RxRDY (SR0) RDN/WRN S = STATUS SD D = DATA SD ADD#1 MR1[4:3] = 11 D0 ADD#2 SD00130 Figure 12. Wake-Up Mode RTS can also be controlled by t
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Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 Table 6. Baud Rates Extended Normal BRG BRG Test CSR[7:4] ACR[7] = 0 ACR[7] = 1 ACR[7] = 0 ACR[7] = 1 0000 50 75 4,800 7,200 0001 110 110 880 880 0010 134.5 134.5 1,076 1,076 0011 200 150 19.2K 14.4K 0100 300 300 28.8K 28.8K 0101 600 600 57.6K 57.6K 0110 1,200 1,200 115.2K 115.2K 0111 1,050 2,000 1,050 2,000 1000 2,400 2,400 57.6K 57.6K 1001 4,800 4,800 4,800 4,800 1010 7,200 1,800 57.6K 14.4K 10
