Parallel Port Interface - Motorola MVME167 Series Installation Manual

Board Level Hardware Description

Parallel Port Interface

2
2-20
The PCCchip2 provides an 8-bit bidirectional parallel port. This
port may be used as a Centronics-compatible parallel printer port
or as a general parallel I/O port.
All eight bits of the port must be either inputs or outputs (no
individual bit selection).
In addition to the 8 bits of data, there are two control pins and five
status pins.
When used as a parallel printer port, these pins function as follows:
Printer Acknowledge (ACK*)
Status Pins
Printer Fault (FAULT*)
Printer Busy (BSY)
Printer Select (SELECT)
Printer Paper Error (PE)
Control Pins Printer Strobe (STROBE*)
Input Prime (INP*)
Each of the status pins can generate an interrupt to the MPU in any
of the following programmable conditions:
high level
low level
high-to-low transition
low-to-high transition