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ST16C452CJ68PS-F датащи(PDF) 5 Page - Exar Corporation |
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ST16C452CJ68PS-F датащи(HTML) 5 Page - Exar Corporation |
5 / 30 page 5 ST16C452/452PS Rev. 3.20 SYMBOL DESCRIPTION Symbol Pin Signal Type Pin Description for either UART channels A/B or A0-A1 for the printer port, onto D0-D7 data bus for a read cycle by an external CPU. -IOW 36 I Write strobe.- A logic 0 transition on this pin will transfer the data on the internal data bus (D0-D7), as defined by either address bits A0-A2 for UART channels A/B or A0-A1 for the printer port, into an internal register during a write cycle from an external CPU. PD7-PD0 46-53 I/O Printer Data port (Bi-directional three state) - These pins are the eight bit, three state data bus for transferring information to or from an external device (usually a printer). D0 is the least significant bit. PD7-PD0 are latched during a write cycle (output mode). PE 67 I Paper Empty - General purpose input or line printer paper empty (Internal pull-up). This pin can be connected to provide a printer out of paper indication. RDOUT 44 O Read Out (active high) - This pin goes to a logic 1 when the external CPU is reading data from the 452/452PS. This signal can be used to enable/disable external transceivers or other logic functions. -RESET 39 I Master Reset (active low) - a logic 0 on this pin will reset the internal registers and all the outputs. The UART transmitter output and the receiver input will be disabled during reset time. (See ST16C452/452PS External Reset Conditions for initialization details.) N.C. 9,61 Not Used. Should be left open. SLCT 65 I Select (with internal pull-up) - General purpose input or line printer select status. Normally this pin is connected to a printer output (active low) that indicates the ready status of a printer, i.e., on-line and/or on-line and ready. -SLCTIN 58 I/O Select In (open drain, with internal pull-up) - General purpose I/O or line printer select. This pin can be read via Bit-3 in the printer command register, or written via bit-3 in the printer control register. As this pin is open-drain, it can be wire-or’d with other outputs. Normally this signal is connected |
Аналогичный номер детали - ST16C452CJ68PS-F |
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Аналогичное описание - ST16C452CJ68PS-F |
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