MAC7200 datasheet(450/976 Pages) FREESCALE

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PFLASH Application Usage

MAC7200 Microcontroller Family Reference Manual, Rev. 2

372

Freescale Semiconductor

Due to the access protection, there is a possible deadlock situation that the user can find themselves in as

follows: If the DACC is programmed to only allow data fetches on Partition 0 ($0000 0000 to $0000

0FFF), and the device is reset, the user will generally be unable to boot the device from the Flash main

array.

1. Boot from the Shadow Block, and enter debug mode. For this to work, the SDACC[0] must be

cleared (i.e.-Instruction fetches allowed).

2. Boot from the external bus (if available).

3. Perform a JTAG Lockout Recovery sequence, which will erase the DACC.

18.7.6

Flash Program/Erase Protection and Selection

Program and Erase protection refers to the ability to protect flash blocks against program and erase

operations, or to program/erase only particular blocks.

Table 18-11 details the block mapping for the

MAC72x2 Flash.

Table 18-12 details the block mapping for the MAC72x1 Flash.

Table 18-11. Flash Program/Erase Blocks - MAC72x2

Address Offset

Block

Number

Size

LML/HBLa

a. Similar mapping also applies to SLL register.

LMS/HBS

$0000 0000

$0001 FFFF

LAS #0

128K (Main Array)

LLOCK[0]

LSEL[0]

$0002 0000

$0003 FFFF

LAS #1

128K (Main Array)

LLOCK[1]

LSEL[1]

$0004 0000

$0004 3FFF

MAS #0

16K (Main Array)

MLOCK[0]

MSEL[0]

$0004 4000

$0004 7FFF

MAS #1

16K (Main Array)

MLOCK[1]

MSEL[1]

$0004 8000

$0004 BFFF

MAS #2

16K (Main Array)

MLOCK[2]

MSEL[2]

$0004 C000

$0004 FFFF

MAS #3

16K (Main Array)

MLOCK[3]

MSEL[3]

$00F0 0000

$00F0 7FFF

n/a

32K (Shadow Block)

SLOCK

PEASb

b. The PEAS field is located in the MCR register

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