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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PC87413 датащи(PDF) 25 Page - National Semiconductor (TI) |
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PC87413 датащи(HTML) 25 Page - National Semiconductor (TI) |
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25 / 257 page  1.0 Signal/Pin Connection and Description (Continued) Revision 1.2 25 www.national.com 1.4.5 Parallel Port Signal Pin/s I/O Buffer Type Power Well Description ACK 78 I INT VDD Acknowledge. Pulsed low by the printer to indicate that it has received data from the parallel port. AFD_DSTRB 90 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 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 77 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 88 I INT VDD Error. Set active low by the printer when it detects an error. INIT 86 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. An external 4.7 K Ω pull-up resistor must be connected to this pin. PD7-3 PD2 PD1 PD0 79-83 85 87 89 I/O INT/O14/14 VDD 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 76 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 75 I INT VDD Select. Set active high by the printer when the printer is selected. SLIN_ASTRB 84 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. 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 91 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 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). PPDIS 121 IINT VDD Parallel Port Disable. When high, this input disables (TRI- STATEs) all the output signals of the parallel port.1 1. If this feature is not used, either select the alternate function (P12 port) at the pin multiplexer (see Section 3.7.3 on page 50) or connect an external 3.3 K Ω pull-down resistor to this pin. If the function connected to the pin is PPDIS and the pin is left unconnected, the output signals of the parallel port will float. |
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