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The pin assignment for the inputs CP and CE is arbitrary and can be reversed for layout convenience. The clock input is a gate-OR structure which allows one input to be used as an active LOW clock enable input (CE) input. These cookies ensure basic functionalities and security features of the website, anonymously. allows parallel-to-serial converter expansion by tying the output Q7 to the input DS of the succeeding stage. Necessary cookies are absolutely essential for the website to function properly. The controller needs a 4 MHz ceramic resonator, X1. If there is a delay on the Centronics port, the RS232 bitstream from the computer may be stopped via the Flow signal (pin 17). The IC also generates the requisite control signals. This is essentially a programmed PIC controller that produces a Centronics compatible signal from a 2400 baud serial signal (eight data bits, no parity, one stop bit).

The serial-to-parallel conversion is effected by IC1. This is an integrated level converter that transforms the single +5V supply into a symmetrical ☑2V one. Since the computer needs real RS232 levels, an adaptation from TTL to RS232 is provided in the converter by a MAX232. The CTS and DSR signals enable handshaking to be implemented. The TxD line, pin 3, CTS line, pin 8 and the DSR line, pin 6, of the serial port are used – see diagram. It converts a serial 2400 baud signal into a parallel signal. This converter may help if just the serial port on a personal computer is free, whereas the printer needs a parallel (Centronics) port.

Parallel to serial converter ic