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PC87391 数据表(PDF) 21 Page - National Semiconductor (TI) |
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PC87391 数据表(HTML) 21 Page - National Semiconductor (TI) |
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21 / 148 page  1.0 Signal/Pin Connection and Description (Continued) 21 www.national.com 1.5.8 Parallel Port 1.5.9 Power and Ground Signal Pin/s I/O Buffer Type Power Well Description ACK 41 I INT VDD Acknowledge. Pulsed low by the printer to indicate that it has received data from the Parallel Port. AFD_DSTRB 53 O OD14,O14/14 VDD AFD - Automatic Feed. When low, instructs the printer to automatically feed a line after printing each line. This pin is in TRI-STATE after a 0 is loaded into the corresponding control register bit. An external 4.7 K Ω pull-up resistor should be attached to this pin. DSTRB - Data Strobe (EPP). Active low, used in EPP mode to denote a data cycle. When the cycle is aborted, DSTRB becomes inactive (high). BUSY_WAIT 40 I INT VDD Busy. Set high by the printer when it cannot accept another character. Wait. In EPP mode, the Parallel Port device uses this active low signal to extend its access cycle. ERR 51 I INT VDD Error. Set active low by the printer when it detects an error. INIT 49 O OD14,O14/14 VDD Initialize. When low, initializes the printer. This signal is in TRI-STATE after a 1 is loaded into the corresponding control register bit. Use an external 4.7 K Ω pull-up resistor. PD7-3, PD2, PD1 PD0 42-46, 48, 50, 52 I/O INT O14/14 VDD Parallel Port Data. Transfer data to and from the peripheral data bus and the appropriate Parallel Port data register. These signals have a high current drive capability. PE 37 I INT VDD Paper End. Set high by the printer when it is out of paper. This pin has an internal weak pull-up or pull-down resistor. SLCT 36 I INT VDD Select. Set active high by the printer when the printer is selected. SLIN_ASTRB 47 O OD14,O14/14 VDD SLIN - Select Input. When low, selects the printer. This signal is in TRI-STATE after a 0 is loaded into the corresponding control register bit. Uses an external 4.7 K Ω pull-up resistor. ASTRB - Address Strobe (EPP). Active low, used in EPP mode to denote an address or data cycle. When the cycle is aborted, ASTRB becomes inactive (high). STB_WRITE 54 O OD14,O14/14 VDD STB - Data Strobe. When low, Indicates to the printer that valid data is available at the printer port. This signal is in TRI- STATE after a 0 is loaded into the corresponding control register bit. An external 4.7 K Ω pull-up resistor should be employed. WRITE - Write Strobe. Active low, used in EPP mode to denote an address or data cycle. When the cycle is aborted, WRITE becomes inactive (high). PNF 35 I INT VDD Printer Not Floppy. This signal selects the internal logical device that is connected to the PPM pins. For details on setting PNF polarity, see Section 2.10.6. Signal Pin/s I/O Buffer Type Power Well Description VDD 14, 39, 63, 88 I PWR - Main 3.3V Power Supply VSS 13, 38, 64, 89 I GND - Ground |
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