MC9S08DN60F1CLF datasheet(62/356 Pages) FREESCALE

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Chapter 4 Memory

MC9S08DN60 Series Data Sheet, Rev 3

Freescale Semiconductor

4.5.11.6

Flash and EEPROM Command Register (FCMD)

Only six command codes are recognized in normal user modes, as shown in Table 4-15. All other

command codes are illegal and generate an access error. Refer to Section 4.5.3, “Program and Erase

Command Execution,” for a detailed discussion of Flash and EEPROM programming and erase

operations.

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 4.5.6, “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

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

if the entire Flash or EEPROM 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 or EEPROM array

is not completely erased.

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

is completely erased (all 0xFFFF).

76543210

00000000

FCMD

Reset

00000000

Figure 4-10. Flash and EEPROM Command Register (FCMD)

Table 4-15. Flash and EEPROM Commands

Command

FCMD

Equate File Label

Blank check

0x05

mBlank

Byte program

0x20

mByteProg

Burst program

0x25

mBurstProg

Sector erase

0x40

mSectorErase

Mass erase

0x41

mMassErase

Sector erase abort

0x47

mEraseAbort

Table 4-14. FSTAT Register Field Descriptions (continued)

Field

Description

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