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ST16C552ACJ68 数据表(PDF) 4 Page - Exar Corporation |
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ST16C552ACJ68 数据表(HTML) 4 Page - Exar Corporation |
4 / 39 page 4 ST16C552/552A Rev. 3.40 SYMBOL DESCRIPTION Symbol Pin Signal Type Pin Description -ERROR 63 I Error, Printer (with internal pull-up) - General purpose input or line printer error. This pin may be connected to the active low (logic 0) output of a printer to indicate an error condition. GND 2,7,54 Pwr Signal and Power Ground. 27 INIT 57 I/O Initialize (open drain, with internal pull-up) - General pur- pose I/O signal. This pin may be connected for initialization service of a connected line printer. Generally when this signal is a logic 0, any connected printer will be initialized. INT A/B 45,60 O Interrupt output A/B ( three state active high) - These pins provide individual channel interrupts, INT A-B. INT A-B are enabled when MCR bit-3 is set to a logic 1, interrupts are enabled in the interrupt enable register (IER), and when an interrupt condition exists. Interrupt conditions include: re- ceiver errors, available receiver buffer data, transmit buffer empty, or when a modem status flag is detected. -INTP 59 O Printer Interrupt, - This pin can be used to signal the interrupt status of a connected printer. This pin basically tracks the -ACK input pin, When INTSEL is a logic 0 and interrupts are enabled by bit-4 in the control register. A latched mode can be selected by setting INTSEL to a logic 1. In this case the interrupt -INTP is generated normally but does not return to the inactive state until the trailing edge of the read cycle (-IOR pin). -INTP is three stated until CON bit-4 is set to a logic 1. The difference between the ST16C552 and ST16C552A is the output state of INTP. INTP is active high (logic 1) on the ST16C552 whereas INTP is active low (logic 0) on the ST16C552A part when the interrupt latch mode is selected. INTSEL 43 I Interrupt Select mode - This pin selects the interrupt type for the printer port (-INTP). When this pin is a logic 0, the external -ACK signal state is generally followed, minus some minor propagation delay. Making this pin a logic 1 or connecting it to VCC will set the interrupt latched mode. In this case the printer interrupt (-INTP) will not return to a logic 0 on the 552 or a logic 1 on the 552A (552A is inverted), until the |
类似零件编号 - ST16C552ACJ68 |
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类似说明 - ST16C552ACJ68 |
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