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COM81C17 Datasheet(PDF) 5 Page - SMSC Corporation |
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COM81C17 Datasheet(HTML) 5 Page - SMSC Corporation |
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5 / 18 page  5 DESCRIPTION OF PIN FUNCTIONS DIP PIN NO. NAME SYMBOL DESCRIPTION 1, 2, 5-7, 9,11-12 DATA BUS D0-D7 An 8-bit bi-driectional DATA BUS is used to interface the TPUART to the processor Data Bus. 3 CHIP SELECT nCS A low level on this input enables the TPUART for reading and writing to the processor. When nCS is high, the DATA BUS is in high impedance and the nWR and nRD will have no effect on the chip. 4 READ DATA STROBE nRD A low pulse on this input (when nCS is low) enables the TPUART to place the data or the status information on the DATA BUS. 8 WRITE DATA STROBE nWR A low pulse on this input (when nCS is low) enables the TPUART to accept the data or control word from the DATA BUS into the TPUART. 10 GROUND GND Power Supply Return. 13 CLOCK CLK External TTL Clock Input (See Table 2) 14 INTERRUPT REQUEST nINT An interrupt request is asserted by the TPUART when an enabled condition has occurred in the Status Register. This is an active low, open drain output. This pin has an internal pullup register. 15 REGISTER SELECT RS During processor to TPUART communications, this input is used to indicate which internal register will be selected for access by the processor. When this input is low, data can be written to the TX Holding Buffer or data can be read from the RX Holding Register. When this input is high control words can be written to the Control Register or status information can be read from the Status Register. 16 RECEIVER DATA RX This input is the receiver serial data. A high to low transition is required to initiate data reception. 17 TRANSMITTER DATA TX This output is the transmitted serial data from the TPUART. When a transmission is concluded, the TX line will always return to the mark (High) state. 18 CONTROL PIN 1 nCP1 This control pin is an input only pin. It can be programmed to perform the functions of CTS or DSR/DCD. 19 CONTROL PIN 2 nCP2 This control pin can be programmed to be either an input or an output. When in input mode, this pin can perform the functions of DSR/DCD. When in output mode, this pin can perform the functions of DTR or RTS. 20 POWER SUPPLY VCC +5V Supply Voltage |
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