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ST16C452IJ68 Datasheet(PDF) 3 Page - Exar Corporation |
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ST16C452IJ68 Datasheet(HTML) 3 Page - Exar Corporation |
3 / 30 page 3 ST16C452/452PS Rev. 3.20 SYMBOL DESCRIPTION Symbol Pin Signal Type Pin Description A0 35 I Address-0 Select Bit - Internal registers address selection. A1 34 I Address-1 Select Bit - Internal registers address selection. A2 33 I Address-2 Select Bit - Internal registers address selection. -ACK 68 I Acknowledge (with internal pull-up) - General purpose input or line printer acknowledge (active low). a logic 0 from the printer, indicates successful data transfer to the print buffer. -AutoFDXT 56 I/O General purpose I/O (open drain, with internal pull-up) or automatic line feed (open drain input with internal pull-up). When this signal is low the printer should automatically line feed after each line is printed. BIDEN 1 I Bi-Direction Enable - PD7-PD0 direction select. A logic 0 sets the parallel port for I/O Select Register Control. A logic 1 sets the parallel port for Control Register Bit-5 Control. BUSY 66 I Busy (with internal pull-up) - General purpose input or line printer busy (active high). can be used as an output from the printer to indicate printer is not ready to accept data. CLK 4 I Clock Input. - An external clock must be connected to this pin to clock the baud rate generator and internal circuitry (see Programmable Baud Rate Generator). -CSA 32 I Chip Select A - A logic 0 at this pin enables the serial channel-A UART registers for CPU data transfers. -CSB 3 I Chip Select B - A logic 0 at this pin enables the serial channel-B UART registers for CPU data transfers. -CSP 38 I Printer Port Chip Select - (active low). A logic 0 at this pin enables the parallel printer port registers and/or PD7-PD0 for external CPU data transfers. D0-D7 14-21 I/O Data Bus (Bi-directional) - These pins are the eight bit, three state data bus for transferring information to or from the controlling CPU. D0 is the least significant bit and the first data bit in a transmit or receive serial data stream. |
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