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ST16C452CJ68 Datasheet(PDF) 6 Page - Exar Corporation |
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ST16C452CJ68 Datasheet(HTML) 6 Page - Exar Corporation |
6 / 30 page 6 ST16C452/452PS Rev. 3.20 Symbol Pin Signal Type Pin Description with a printer to select the printer with an active low. -STROBE 55 I/O Strobe (open drain, with internal pull-up) - General purpose I/O or data strobe output. Normally this output is connected to a printer and indicates that valid data is available at the printer port (PD0-PD7). N.C. 22,42 Not Used. Should be left open. VCC 23,40,64 Pwr 2.97 to 5.5V power supply input. All inputs are 5V tolerant except for XTAL1 and all printer port inputs for devices with top mark date code of "F2 YYWW" and newer. -CD A/B 29,8 I Carrier Detect (active low) - These inputs are associated with individual UART channels A through B. A logic 0 on this pin indicates that a carrier has been detected by the modem for that channel. -CTS A/B 28,13 I Clear to Send (active low) - These inputs are associated with individual UART channels, A through B. A logic 0 on this pin(s) indicates the modem or data set is ready to accept transmit data from the 452/452PS for the given channel. Status can be tested by reading MSR bit-4 for that channel(s). -CTS has no effect on the transmit or receive operation. -DSR A/B 31,5 I Data Set Ready (active low) - These inputs are associated with individual UART channels, A through B. A logic 0 on this pin(s) indicates the modem or data set is powered-on and is ready for data exchange with the UART. This pin has no effect on the UART’s transmit or receive operation. -DTR A/B 25,11 O Data Terminal Ready (active low) - These outputs are associated with individual UART channels, A through B. A logic 0 on this pin(s) indicates that the 452/452PS is powered-on and ready. This pin can be controlled via the modem control register for channel(s) A-B. Writing a logic 1 to MCR bit-0 will set the -DTR output to logic 0, enabling the modem. This pin will be a logic 1 after writing a logic 0 to MCR bit-0, or after a reset. This pin has no effect on the UART’s transmit or receive operation. -RI A/B 30,6 I Ring Indicator (active low) - These inputs are associated with SYMBOL DESCRIPTION |
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