ROHS MC9S08QE128 Reference Manual page 76

Chapter 4 Memory
Field
4 Flash Access Error Flag — The FACCERR flag indicates an illegal access has occurred to the flash memory
FACCERR or flash IFR caused by either a violation of the command write sequence (see
Write Sequence"), issuing an illegal flash command (see
while a command is executing (FCCF = 0). Writing a 0 to the FACCERR flag has no effect on FACCERR. The
FACCERR flag is cleared by writing a 1 to FACCERR.While FACCERR is set, it is not possible to launch a
command or start a command write sequence.
0 No access error detected.
1 Access error has occurred.
2 Flash Flag Indicating the Erase Verify Operation Status — When the FCCF flag is set after completion of an
FBLANK erase verify command, the FBLANK flag indicates the result of the erase verify operation. The FBLANK flag is
cleared by the flash module when FCBEF is cleared as part of a new valid command write sequence. Writing to
the FBLANK flag has no effect on FBLANK.
0 Flash block verified as not erased.
1 Flash block verified as erased.
4.6.2.6 Flash Command Register (FCMD)
The FCMD register is the flash command register.
7
R 0
W
Reset 0
All FCMD bits are readable and writable during a command write sequence while bit 7 reads 0 and is not
writable.
Field
6:0 Flash Command — Valid flash commands are shown in
FCMD[6:0] listed in Table 4-21
76
Table 4-19. FSTAT Field Descriptions
6 5
0 0
= Unimplemented or Reserved
Figure 4-15. Flash Command Register (FCMD)
Table 4-20. FCMD Field Descriptions
sets the FACCERR flag in the FSTAT register.
Table 4-21. Valid Flash Command List
FCMD[6:0]
0x05
0x20
0x25
0x40
0x41
MC9S08QE128 MCU Series Reference Manual, Rev. 2
Description
Table 4-21), or the execution of a CPU STOP instruction
4 3
FCMD
0 0
Description
Table 4-21. Writing any command other than those
NVM Command
Erase Verify
Program
Burst Program
Sector Erase
Mass Erase
Section 4.6.3.1.2, "Command
2 1
0 0
Freescale Semiconductor
0
0