Description

The ST78C34CJ44 is a monolithic bidirectional parallel port designed for general purpose I/O operations. It is specifically designed to be configurable as a CENTRONICS printer port. With its 83-byte internal FIFO, it offers efficient and streamlined data transfer. The FIFO operation can be enabled or disabled as per the requirement. All the registers of the ST78C34CJ44 are mapped to IBM printer port registers, ensuring compatibility with various systems. This model is designed to function as a normal printer interface without any additional settings. The FIFO content is cleared after a reset or when the INIT pin is set to a low state. The auto FIFO operation starts after receiving the first -ACK signal from the printer, ensuring smooth and fast data transfer at the printer's loading speed.

Specifications and Features

• 83 bytes of printer output FIFO
• Bi-directional software parallel port
• Bi-directional I/O ports
• Register compatibility with IBM XT, AT, compatible 386, 486
• Selectable interrupt polarity
• Selectable FIFO interrupts

Application Scenarios

The ST78C34CJ44 is suitable for a wide range of applications including:

• CENTRONICS printer ports
• General purpose input/output control

Comparison

- 83-byte internal FIFO allows efficient data transfer

- No specific disadvantages for the ST78C34CJ44 model have been reported