Datasheet
Chapter 4 Memory
MC9S08DZ60 Series Data Sheet, Rev. 4
Freescale Semiconductor 67
4.5.11.6 Flash and EEPROM Command Register (FCMD)
Only six command codes are recognized in normal user modes, as shown in Table 4-16. 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.
4
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.
2
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
R00000000
W FCMD
Reset 00000000
Figure 4-10. Flash and EEPROM Command Register (FCMD)
Table 4-16. 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 4-15. FSTAT Register Field Descriptions (continued)
Field Description