MAC7200 datasheet(441/976 Pages) FREESCALE

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PFLASH Application Usage

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

363

18.7.2

Enabling the PFLASH

It is not necessary to enable the Flash controller before it can be used. However, it is generally a good idea

to configure the correct settings in the Flash controller as soon as possible after boot for performance

reasons.

18.7.3

Flash Array Memory Map

Please refer to Section 9.12, “Flash Main Array Memory Map” and Section 9.13, “Shadow Block Memory

Map” for more details on the Flash Main Array and Shadow Block memory map.

18.7.4

Flash Registers

The Flash related registers are located in two places:

•

Flash Block - Programming/Erase and BIU registers located within the Peripheral Bus space of the

Flash block itself. The BIU registers are used by the Flash Controller for access protection and

performance tuning.

•

MCM - Flash Write ACCess (WACC) register located within the Peripheral Bus space of the MCM

block.

18.7.4.1

Flash Block User Registers

These registers are located within the Peripheral Bus space of the Flash (at $FC0F 0000), and include

program/erase related registers and BIU registers.

Read-while-Write (RWW)

The ability to read code/data from one partition while erasing or programming another

partition.

Block

The smallest unit to which Erase/Program Protection may be applied.

Partition

The smallest unit to which Read-while-Write may be applied.

Programmed

A bit is programmed when it is logical ‘0’

Erased

A bit is erased when it is logical ‘1’

Suspend

Suspends the current erase of a block so a read could be done within its partition.

Table 18-3. Flash Block IPI User Registers

Address

Offset

Function

Reset Value

MCR

$0000

Module Configuration

$1101 3600

LML

$0004

LAS/MAS/Shadow Erase/Program Protection

From Shadow $7de8

HBL

$0008

HAS Erase/Program Protection

From Shadow $7df0

SLL

$000c

LAS/MAS Erase/Program Protection

From Shadow $7df8

Table 18-2. Flash Terminology

Term

Definition

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