HCS08 datasheet(60/316 Pages) NXP

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Chapter 4 Memory

MC9S08SG8 MCU Series Data Sheet, Rev. 8

Freescale Semiconductor

4.7.6

FLASH Command Register (FCMD)

Only five command codes are recognized in normal user modes as shown in Table 4-13. Refer to Section

4.5.3, “Program and Erase Command Execution,” for a detailed discussion of FLASH programming and

erase operations.

All other command codes are illegal and generate an access error.

It is not necessary to perform a blank check command after a mass erase operation. Only blank check is

required as part of the security unlocking mechanism.

FACCERR

Access Error Flag — FACCERR is set automatically when the proper command sequence is not obeyed exactly

(the erroneous command is ignored), if a program or erase operation is attempted before the FCDIV register has

been initialized, or if the MCU enters stop while a command was in progress. For a more detailed discussion of

the exact actions that are considered access errors, see Section 4.5.5, “Access Errors.” FACCERR is cleared by

writing a 1 to FACCERR. Writing a 0 to FACCERR has no meaning or effect.

0 No access error.

1 An access error has occurred.

FBLANK

FLASH Verified as All Blank (erased) Flag — FBLANK is set automatically at the conclusion of a blank check

command if the entire FLASH array was verified to be erased. FBLANK is cleared by clearing FCBEF to write a

new valid command. Writing to FBLANK has no meaning or effect.

0 After a blank check command is completed and FCCF = 1, FBLANK = 0 indicates the FLASH array is not

completely erased.

1 After a blank check command is completed and FCCF = 1, FBLANK = 1 indicates the FLASH array is

completely erased (all 0xFF).

321

000

WFCMD

Reset

000

Figure 4-10. FLASH Command Register (FCMD)

Table 4-13. FLASH Commands

Command

FCMD

Equate File Label

Blank check

0x05

mBlank

Byte program

0x20

mByteProg

Byte program — burst mode

0x25

mBurstProg

Page erase (512 bytes/page)

0x40

mPageErase

Mass erase (all FLASH)

0x41

mMassErase

Table 4-12. FSTAT Register Field Descriptions (continued)

Field

Description

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