DVR21 datasheet(239/416 Pages) MICROCHIP

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 2016-2018 Microchip Technology Inc.

DS30010118D-page 239

PIC24FJ256GA705 FAMILY

20.0 ENHANCED PARALLEL

MASTER PORT (EPMP)

The Enhanced Parallel Master Port (EPMP) module pro-

vides a parallel, 4-bit (Master mode only) or 8-bit (Master

and Slave modes) data bus interface to communicate

with off-chip modules, such as memories, FIFOs, LCD

Controllers and other microcontrollers. This module

can serve as either the master or the slave on the

communication bus.

For EPMP Master modes, all external addresses are

mapped into the internal Extended Data Space (EDS).

This is done by allocating a region of the EDS for each

Chip Select, and then assigning each Chip Select to a

particular external resource, such as a memory or

external controller. This region should not be assigned

to another device resource, such as RAM or SFRs. To

perform a write or read on an external resource, the

CPU simply performs a write or read within the address

range assigned for the EPMP.

Key features of the EPMP module are:

• Extended Data Space (EDS) Interface Allows

Direct Access from the CPU

• Up to Ten Programmable Address Lines

• Up to Two Chip Select Lines

• Up to Two Acknowledgment Lines

(one per Chip Select)

• 4-Bit or 8-Bit Wide Data Bus

• Programmable Strobe Options (per Chip Select):

- Individual read and write strobes or;

- Read/Write strobe with enable strobe

• Programmable Address/Data Multiplexing

• Programmable Address Wait States

• Programmable Data Wait States (per Chip Select)

• Programmable Polarity on Control Signals

(per Chip Select)

• Legacy Parallel Slave Port Support

• Enhanced Parallel Slave Support:

- Address support

- 4-byte deep auto-incrementing buffer

Only the higher pin count packages in the family

implement the EPMP. The EPMP feature is not available

on 28-pin devices.

Note:

This data sheet summarizes the features of

this group of PIC24F devices. It is not

intended to be a comprehensive reference

source. For more information, refer to

the “dsPIC33/PIC24 Family Reference

Manual”, “Enhanced Parallel Master

Port (EPMP)” (DS39730), which is

available from the Microchip website

(www.microchip.com). The information in

this data sheet supersedes the information

in the FRM.

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