INTEGRATED CIRCUITS SCC2691 Universal asynchronous receiver/transmitter (UART) Product data sheet Supersedes data of 1998 Sep 04 2006 Aug 04
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) DESCRIPTION SCC2691 PIN CONFIGURATIONS The Philips Semiconductors SCC2691 Universal Asynchronous Receiver/Transmitter (UART) is a single-chip CMOS-LSI communications device that provides a full-duplex asynchronous receiver/transmitter. It is fabricated with Philips Semiconductors CMOS technology which combines the benefits of high density and low power consumption.
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 ORDERING INFORMATION COMMERCIAL INDUSTRIAL VCC = +5V +10%, TA = 0°C to +70°C VCC = +5V +10%, TA = –40°C to +85°C VERSION 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 PACKAGES 24-Pin Plastic Dual In-Line Package (DIP) SOT137-1 BLOCK DIAGRAM INTERNAL
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 PIN DESCRIPTION MNEMONIC PIN NO. TYPE NAME AND FUNCTION DIP PLCC 22–15 27, 25, 24, 22–18 I Data Bus: Active-high 8-bit bidirectional 3-State data bus. Bit 0 is the LSB and bit 7 is the MSB. All data, command, and status transfers between the CPU and the UART take place over this bus. The direction of the transfer is controlled by the WRN and RDN inputs when the CEN input is low.
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 ABSOLUTE MAXIMUM RATINGS1 PARAMETER SYMBOL TA RATING UNIT Note 4 °C Operating ambient temperature range2 TSTG Storage temperature range –65 to +150 °C VCC Voltage from VCC to GND3 –0.5 to + 7.0 V VS Voltage from any pin to PD Power Dissipation ground3 –0.5 to VCC +10% V 300 mW NOTES: 1.
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 AC ELECTRICAL CHARACTERISTICS1, 2, 3, 4 SYMBOL LIMITS PARAMETER Min Typ Max UNIT Reset timing (Figure 3) tRES Reset pulse width Bus timing (Figure 4)5 100 ns tAS A0–A2 setup time to RDN, WRN low tAH A0–A2 hold time from RDN, WRN low tCS CEN setup time to RDN, WRN low tCH CEN hold time from RDN, WRN high tRW WRN, RDN pulse width tDD Data valid after RDN low tDF Data bus floating after RDN high t
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2692, SCC68681 and SCC2698B” Philips Semiconductors ICs for Data Communications, IC-19, 1994. BLOCK DIAGRAM 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 command via the command register.
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) one-half of the bit period after the stop bit was sampled, then the receiver operates as if a new start bit transition had been detected at that point(one-half bit time after the stop bit was sampled). values of CTUR and CTLR at any time, but the new count becomes effective only on the next start counter command following a stop counter command.
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) In addition to the normal transmitter and receiver operation described above, the UART incorporates a special mode which provides automatic wake-up of the receiver through address frame recognition for multi-processor communications. This mode is selected by programming bits MR1[4:3] to ‘11’.
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) immediately. An exception to this is switching out of auto-echo or remote loopback modes; if the deselection occurs just after the receiver has sampled the stop bit (indicated in auto-echo by assertion o fRxRDY), and the transmitter is enabled, the transmitter is enabled, the transmitter will remain in auto-echo mode until one full stop bit has been retransmitted. parity mode is programmed.
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) Table 2.
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] Bit 7 C/T[14] C/T[13] C/T[12] C/T[11] C/T[10] C/T[9] C/T[8] Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 C/T[4] C/T[3] C/T[2] C/T[1] C/T[0] CTLR (Counter/Timer Lower Register) C/T[7] C/T[6] C/T[5] 0011 Reset transmitter.
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 SR[2] – Transmitter Ready (TxRDY) This bit, when set, indicates that the THR is empty and ready to be loaded with a character. This bit is cleared when the THR is loaded by the CPU and is set when the character is transferred to the transmit shift register. TxRDY is reset when the transmitter is disabled and is set when the transmitter is first enabled, e.g.
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) to placing the SCC2691 in this mode. Note that this bit must be set to a logic 1 after reset. 011 When the power-down mode is enabled, internal circuitry forces the X1/CLK pin to the low state and the X2 pin to the high state.
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) 0.3/26.3 which is 1.14%; well within the ability asynchronous mode of operation. IMR – Interrupt Mask Register 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 the IMR is a ‘1’, the INTRN output is asserted (low).
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 RDN tPS tPH MPI WRN tPD MPO SD00125 Figure 5. I/O Timing VM WRN tIR VOL +0.5V INTERRUPT 1 OUTPUT VOL RDN tIR INTERRUPT 1 OUTPUT VOL +0.5V VOL 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.
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 1 BIT TIME (1 OR 16 CLOCKS) TxC (INPUT) tTXD TxD tTCS TxC (1X OUTPUT) SD00092 Figure 8. Transmit Timing RxC (1X INPUT) tRXS tRXH RxD SD00093 Figure 9.
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) TxD D1 D2 D2 D3 D3 BREAK SCC2691 D4 D6 TRANSMITTER ENABLED TxRDY (SR2) WRN D1 START BREAK D4 STOP BREAK D5 WILL NOT BE TRANSMITTED D6 CTSN1 (MPI) RTSN2 (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.
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) MASTER STATION BIT 9 ADD#1 TxD BIT 9 1 D0 SCC2691 BIT 9 0 ADD#2 1 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 RxD 0 BIT 9 ADD#1 BIT 9 1 D0 0 ADD#2 BIT 9 BIT 9 1 0 RECEIVER ENABLED RxRDY (SR0) RDN/WRN MR1[4:3] = 11 S ADD#1 D S = STATUS D = DATA D0 S D ADD#2 SD00130 Figure 12.
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.
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) DIP24: plastic dual in-line package; 24 leads (300 mil) 2006 Aug 04 21 SCC2691 SOT222-1
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SO24: plastic small outline package; 24 leads; body width 7.
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) PLCC28: plastic leaded chip carrier; 28 leads 2006 Aug 04 SCC2691 SOT261-2 23
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 REVISION HISTORY Rev Date Description _3 20060804 Product data sheet (9397 750 14951). Supersedes data of 1998 Sep 04 (9397 750 04358). Modifications: • Ordering information: changed Version for PLCC28 from SOT261–3 to SOT261–2 • Changed package outline drawing from SOT261–3 to SOT261–2. _2 19980904 _1 19950501 2006 Aug 04 Product specification (9397 750 04358). ECN 853-1078 19971.
Philips Semiconductors Product data sheet Universal asynchronous receiver/transmitter (UART) SCC2691 Legal Information Data sheet status Document status [1][2] Product status[3] Definition Objective [short] data sheet Development This document contains data from the objective specification for product development. Preliminary [short] data sheet Qualification This document contains data from the preliminary specification.
