MC68322 View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

MFG CO.

MC68322

Integrated Printer Processor

Motorola => Freescale 

Freescale Semiconductor, Inc.

PARALLEL PORT INTERFACE (PPI)

The MC68322 contains a direct, IEEE 1284 Level 2 compliant, bi-directional 8-bit PPI. The PPI supports four

IEEE 1284 communications modes: compatibility (Centronics), nibble, byte, and enhanced capabilities port

(ECP). It also fully supports all variants of these modes, including device ID requests and run-length

encoded data compression.

The PPI contains specialized hardware to provide automatic handshaking during forward data transfers.

When hardware handshaking is used in conjunction with the parallel port's dedicated DMA controller,

transfer rates as high as 2 Mbytes/sec can be achieved in the ECP forward mode. The hardware

handshaking can also be completely disabled to allow software to directly control the parallel port interface

signals and to support new protocols. Control and data signals are brought out to provide a glueless

interface to the parallel port.

MOTOROLA

MC68322 PRODUCT INFORMATION

11

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