MC9S08DN60 Datasheet, PDF (62/354 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 4 Memory
Table 4-14. FSTAT Register Field Descriptions (continued)
Field
Description
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).
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.
7
6
5
4
3
2
1
0
R
0
0
0
0
0
0
0
0
W
FCMD
Reset
0
0
0
0
0
0
0
0
Figure 4-10. Flash and EEPROM Command Register (FCMD)
Table 4-15. Flash and EEPROM Commands
Command
Blank check
Byte program
Burst program
Sector erase
Mass erase
Sector erase abort
FCMD
0x05
0x20
0x25
0x40
0x41
0x47
Equate File Label
mBlank
mByteProg
mBurstProg
mSectorErase
mMassErase
mEraseAbort
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.
MC9S08DN60 Series Data Sheet, Rev 2
62
Freescale Semiconductor