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ST78C34IP40 Datasheet(PDF) 4 Page - Exar Corporation |
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ST78C34IP40 Datasheet(HTML) 4 Page - Exar Corporation |
4 / 21 page 6-6 ST78C34 Rev. 3.00 SYMBOL DESCRIPTION Symbol Pin Signal Pin Description 40 44 type -ERROR 1 1 I General purpose input or line printer error (active low, with internal pull-up). This is an output from the printer to indicate an error by holding it low during error condition. SLCT 2 2 I General purpose input or line printer selected (active high, with internal pull-up). This is an output from the printer to indicate that the line printer has been selected. BUSY 3 3 I General purpose input or line printer busy (active high, with internal pull-up). An output from the printer to indicate printer is not ready to accept data. -ACK 4 4 I General purpose input or line printer acknowledge (active low, with internal pull-up). An output from the printer to indicate that data has been accepted successfully. PE 5 5 I General purpose input or line printer paper empty (active high, with internal pull-up). An output from the printer to indicate out of paper. INTSEL 6 8 I Interrupt select mode. The external -ACK can be selected as an interrupt source by connecting this pin to the VCC or left open. Connecting this pin to GND will set the interrupt to latched mode, reading the status register resets the INT output. D0-D7 14-7 16-9 I/O Bi-directional data bus. Eight bit, three state data bus to transfer information to or from the CPU. D0 is the least significant bit of the data bus. INT 16 19 O Interrupt output (selectable active low or high). To signal the state of the printer port. This pin tracks the -ACK input pin, When -ACK is low INT is low and when -ACK is high INT is high if selected as active low interrupt. XTAL1 17 20 I Crystal input 1 or external clock input. A crystal can be connected to this pin and XTAL2 pin to utilize the internal oscillator circuit. An external clock can be used to clock oscillator circuit. XTAL2 18 21 O Crystal input 2 or buffered clock output. See XTAL1. -CS 19 22 I Chip select (active low). A low at this pin enables the ST78C34 / CPU data transfer operation. |
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