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数据搜索系统，热门电子元器件搜索 |
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PC87373 数据表(PDF) 18 Page - National Semiconductor (TI) |
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PC87373 数据表(HTML) 18 Page - National Semiconductor (TI) |
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18 / 174 page  1.0 Signal/Pin Connection and Description (Continued) 18 www.national.com Revision 1.1 1.4.3 Parallel Port Signal Pin(s) I/O Buffer Type Power Well Description ACK 36 I INT VDD3 Acknowledge. Pulsed low by the printer to indicate that it has received data from the parallel port. AFD_DSTRB 50 O OD14,O14/14 VDD3 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 must be connected 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 35 I INT VDD3 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 45 I INT VDD3 Error. Set active low by the printer when it detects an error. INIT 48 O OD14,O14/14 VDD3 Initialize. When low, initializes the printer. This signal is in TRI-STATE after a 1 is loaded into the corresponding control register bit. An external 4.7 K Ω pull-up resistor must be connected to this pin. PD7-0 37-44 I/O INT/O14/14 VDD3 Parallel Port Data. Transfers data to and from the peripheral data bus and the appropriate parallel port data register. These signals have a high current drive capability. PE 34 I INT VDD3 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 33 I INT VDD3 Select. Set active high by the printer when the printer is selected. SLIN_ASTRB 47 O OD14,O14/14 VDD3 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. An external 4.7 K Ω pull-up resistor must be connected to this pin. 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 51 O OD14,O14/14 VDD3 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 must be connected to this pin. 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). |
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