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INTEGRATED CIRCUITS
SC28L91
3.3 V or 5.0 V Universal Asynchronous
Receiver/Transmitter (UART)
Product data sheet 2004 Oct 21
Supersedes data of 2000 Sep 22
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Philips Semiconductors Product data sheet 3.3 V or 5.0 V Universal Asynchronous SC28L91 Receiver/Transmitter (UART) DESCRIPTION • 16-bit programmable Counter/Timer The SC28L91 is a new member of the IMPACT family of Serial • Programmable baud rate for each receiver and transmitter Communications Controllers. It is a single channel UART operating selectable from: at 3.3 V and 5.0 V V , 8 or 16 byte FIFOs and is quite compatible CC with software of the SC28L92 and previous UARTs offered by – 28 fi
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Philips Semiconductors Product data sheet 3.3 V or 5.0 V Universal Asynchronous SC28L91 Receiver/Transmitter (UART) ORDERING INORMATION Industrial V = +3.3 V ± 10 %, +5 V ± 10 % CC Description T = –40 °C to +85 °C Drawing Number amb
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Philips Semiconductors Product data sheet 3.3 V or 5.0 V Universal Asynchronous SC28L91 Receiver/Transmitter (UART) PIN CONFIGURATION DIAGRAM 80XXX PIN CONFIGURATION 44 34 6 1 40 7 39 1 33 PLCC PQFP 11 23 29 17 18 28 12 22 Pin Function Pin Function Pin Function Pin Function Pin Function Pin Function 1A3 16 GND 31 x2 1NC 16 OP5 31 OP2 2 IP0 17 GND 32 RESET 2A0 17 OP7 32 OP0 3 WRN 18 INTRN 33 CEN 3 IP3 18 D1 33 TxDA 4 RDN 19 D6 34 IP2 4A1 19 D3 34 NC 5V 20 D4 35 IP6 CC 5 IP1 20 D5 35 RxDA 6 No Con
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Philips Semiconductors Product data sheet 3.3 V or 5.0 V Universal Asynchronous SC28L91 Receiver/Transmitter (UART) PIN CONFIGURATION DIAGRAM 68XXX PIN CONFIGURATION 44 34 6 1 40 7 39 1 33 PLCC PQFP 11 23 29 17 18 28 12 22 Pin Function Pin Function Pin Function Pin Function Pin Function Pin Function 1A3 16 GND 31 x2 1NC 16 OP5 31 OP2 2 IP0 17 GND 32 RESETN 2A0 17 OP7 32 OP0 3 R/WN 18 INTRN 33 CEN 3 IP3 18 D1 33 TxDA 4 DACKN 19 D6 34 IP2 4A1 19 D3 34 NC 5V 20 D4 35 IACKN CC 5 IP1 20 D5 35 RxDA 6
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Philips Semiconductors Product data sheet 3.3 V or 5.0 V Universal Asynchronous SC28L91 Receiver/Transmitter (UART) 8 DATA CHANNEL D0–D7 BUS BUFFER 16 BYTE TRANSMIT TxDA FIFO TRANSMIT SHIFT REGISTER OPERATION CONTROL RDN 16 BYTE RECEIVE FIFO WRN ADDRESS DECODE RxDA CEN WATCH DOG TIMER 4 A0–A3 RECEIVE SHIFT R/W CONTROL REGISTER RESET MRA0, 1, 2 CRA SRA INTERRUPT CONTROL INTRN IMR ISR GP INPUT PORT CHANGE OF TIMING STATE 7 DETECTORS (4) IP0-IP6 BAUD RATE GENERATOR IPCR ACR CLOCK SELECTORS COUNTER/
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Philips Semiconductors Product data sheet 3.3 V or 5.0 V Universal Asynchronous SC28L91 Receiver/Transmitter (UART) 8 DATA CHANNEL D0–D7 BUS BUFFER 16 BYTE TRANSMIT TxDA FIFO TRANSMIT SHIFT REGISTER OPERATION CONTROL R/WN 16 BYTE RECEIVE FIFO IACKN ADDRESS DECODE RxDA CEN WATCH DOG TIMER 4 A0–A3 RECEIVE SHIFT R/W CONTROL REGISTER RESETN MRA0, 1, 2 CRA SRA INTERRUPT CONTROL INTRN IMR ISR DACKN IVR INPUT PORT CHANGE OF TIMING STATE 6 DETECTORS (4) IP0-IP5 BAUD RATE GENERATOR IPCR ACR CLOCK SELECTO
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Philips Semiconductors Product data sheet 3.3 V or 5.0 V Universal Asynchronous SC28L91 Receiver/Transmitter (UART) PIN CONFIGURATION FOR 80XXX BUS INTERFACE (INTEL ) Pin type Symbol 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 I/O Data Bus: Bi-directional 3-State data bus used to transfer commands, data and status between the UART and the CPU. D0 is the least significant bit. CEN I Chip Enable:
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Philips Semiconductors Product data sheet 3.3 V or 5.0 V Universal Asynchronous SC28L91 Receiver/Transmitter (UART) PIN CONFIGURATION FOR 68XXX BUS INTERFACE (MOTOROLA ) Pin Symbol 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: Bi-directi
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Philips Semiconductors Product data sheet 3.3 V or 5.0 V Universal Asynchronous SC28L91 Receiver/Transmitter (UART) 1 ABSOLUTE MAXIMUM RATINGS Symbol Parameter Rating Unit 2 T Operating ambient temperature range Note 4 °C amb 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 GND –0.5 to V +0.5 V S CC P Package power dissipation (PLCC44) 2.4 W D P Package power dissipation (PQFP44) 1.78 W D Derating factor above 25 °C (PLCC4
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Philips Semiconductors Product data sheet 3.3 V or 5.0 V Universal Asynchronous SC28L91 Receiver/Transmitter (UART) 1, 2, 3 DC ELECTRICAL CHARACTERISTICS V = 3.3 V ± 10 %, T = –40 °C to +85 °C, unless otherwise specified. CC amb Symbol Parameter Conditions Min Typ Max Unit V Input low voltage 0.65 0.2*V V IL CC V Input high voltage 0.8*V 1.7 V IH CC V Output low voltage 0.2 0.4 V I = 2.4 mA OL OL 4 V Output high voltage (except OD outputs) V – 0.5 V – 0.2 V I = –400 μA OH CC CC OH I X1/CLK inp
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Philips Semiconductors Product data sheet 3.3 V or 5.0 V Universal Asynchronous SC28L91 Receiver/Transmitter (UART) 1, 2, 3, 4 AC CHARACTERISTICS (5 VOLT) V = 5.0 V ± 10 %, T = –40 °C to +85 °C, unless otherwise specified. CC amb Symbol Parameter Min Typ Max Unit Reset Timing (See Figure 4) t Reset pulse width 100 18 ns
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Philips Semiconductors Product data sheet 3.3 V or 5.0 V Universal Asynchronous SC28L91 Receiver/Transmitter (UART) Symbol Parameter Min Typ Max Unit Receiver Timing, external clock (See Figure 13) t RxD data setup time to RxC high 50 40 ns *RXS t RxD data hold time from Rx
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Philips Semiconductors Product data sheet 3.3 V or 5.0 V Universal Asynchronous SC28L91 Receiver/Transmitter (UART) 1, 2, 3, 4 AC CHARACTERISTICS (3.3 VOLT) V = 3.3 V ± 10 %, T = –40 °C to +85 °C, unless otherwise specified. CC amb Symbol Parameter Min Typ Max Unit Reset Timing (See Figure 4) t Reset pulse width 100 20 ns
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Philips Semiconductors Product data sheet 3.3 V or 5.0 V Universal Asynchronous SC28L91 Receiver/Transmitter (UART) Symbol Parameter Min Typ Max Unit Receiver Timing, external clock (See Figure 13) t RxD data setup time to RxC high 50 10 ns *RXS t RxD data hold time from Rx
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Philips Semiconductors Product data sheet 3.3 V or 5.0 V Universal Asynchronous SC28L91 Receiver/Transmitter (UART) Block Diagram TIMING CIRCUITS The SC28L91 UART consists of the following seven major sections: Crystal Clock data bus buffer, operation control, interrupt control, timing, Rx and The timing block consists of a crystal oscillator, a baud rate Tx FIFO Buffers, input port and output port control. Refer to the generator, a programmable 16-bit counter/timer, and four clock Block Diagram
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Philips Semiconductors Product data sheet 3.3 V or 5.0 V Universal Asynchronous SC28L91 Receiver/Transmitter (UART) This continues regardless of issuance of the stop counter command. ISR [3], and the interrupt. Invoking the ‘Set Timeout Mode On’ ISR[3] is reset by the stop counter command. command, CRx = 0xAn, will also clear the counter ready bit and stop the counter until the next character is received. The counter timer is NOTE: Reading of the CTU and CTL registers in the timer mode is contro
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Philips Semiconductors Product data sheet 3.3 V or 5.0 V Universal Asynchronous SC28L91 Receiver/Transmitter (UART) “just missed” and the first change-of-state is not detected until 25 μs If CTS option is enabled (MR2[4] = 1), the CTS input at IP0 or IP1 later. must be Low in order for the character to be transmitted. The transmitter will check the state of the CTS input at the beginning of Output Port the character transmitted. If it is found to be High, the transmitter will The output ports ar
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Philips Semiconductors Product data sheet 3.3 V or 5.0 V Universal Asynchronous SC28L91 Receiver/Transmitter (UART) in the status register is set whenever one or more characters are read. This situation may occur at the end of a transmission when the available to be read, and a FFULL status bit is set if all 8 or 16 stack last few characters received are not sufficient to cause an interrupt. positions are filled with data. Either of these bits can be selected to This counter times out after 64 b
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Philips Semiconductors Product data sheet 3.3 V or 5.0 V Universal Asynchronous SC28L91 Receiver/Transmitter (UART) latency is longer than the pause in the data stream.) In this case, character if the received A/D bit is a zero (data tag). If enabled, all when a new character has been received, the counter/timer will be received characters are transferred to the CPU via the RxFIFO. In restarted by the receiver, thereby withdrawing its interrupt. If, at this either case, the data bits are loaded
