MAC7200 datasheet(440/976 Pages) FREESCALE

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PFLASH Application Usage

MAC7200 Microcontroller Family Reference Manual, Rev. 2

362

Freescale Semiconductor

— Shadow Block (New - MAC72x2): 1x32K

•

Access Protection partitioning changed

— Write protection for DACC/SACC registers changed

— Added WACC (write protect) for Flash main array only(Same partitioning as SACC/DACC)

— Flash Main Array (Old): 15x4K + 2x196K + 15x4K

— Flash Main Array (New): 15x4K + 1x196K + 15x4K + 1x196K

— Shadow Block (Old): 2x2K + 1x4K + 2x8K + 1x4K + 2x2K

— Shadow Block (New - MAC72x2): 8x4K

•

Read-while-Write (RWW) partitioning changed

— Flash Main Array (Old): 1x512K

— Flash Main Array (New - MAC72x2): 128K + 128K + 2x16K + 2x16K

— Shadow Block (Old): 1x32K

— Shadow Block (New - MAC72x2): 1x32K

•

Number of wait states increased

•

Shadow Block base address changed to FLASH_BASE + $00F0 0000

•

Security enforcement changed

— Removed Backdoor Access functionality

— Remove the KEYEN[1:0] bits from the Security Word

— Renamed CFMSEC register to System Censor Word

•

Memory map relocation (based on security/chip mode) is unchanged

•

Lockout Recovery changed

— Lockout Recovery now erases the Shadow Block as well

— Must set "start lockout recovery" bit in SC4 with RESET asserted

— No need to clear the "start lockout recovery" bit in SC4 - self clearing

— No need to re-program security word - done automatically at the end

—Must reset device at end of lockout recovery

— No software lockout recovery (i.e.-from Expanded Mode)

18.7

PFLASH Application Usage

18.7.1

Flash Terminology

Table 18-2. Flash Terminology

Term

Definition

Access Protection

The ability to block accesses of a defined type (i.e.-read vs. write, user vs. supervisor, etc.)

on a section of Flash memory. This differs from Erase/Program Protection.

Erase/Program Protection

The ability to erase or program a section of Flash memory. This differs from Access

Protection.

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