CHAPTER 16 FLASH MEMORY
User’s Manual U18172EJ2V0UD
253
MOV
FLAPLC,#0FFH
; Fixes FLAPLC to “FFH”
MOV
WDTE,#0ACH
; Clears & restarts WDT
HALT
; Self programming is started
MOV
A,PFS
CMP
A,#00H
BNZ
$StatusError
; Checks blank check error
; Performs abnormal termination processing when an error
;
occurs.
MOV
FLCMD,#00H
; Clears FLCMD register
ModeOffLoop:
MOV
PFS,#00H
; Clears flash status register
MOV
PFCMD,#0A5H
; PFCMD register control
MOV
FLPMC,#00H
; FLPMC register control (sets value)
MOV
FLPMC,#0FFH
; FLPMC register control (inverts set value)
MOV
FLPMC,#00H
; Sets normal mode via FLPMC register control (sets value)
BT PFS.0,$ModeOffLoop
; Checks completion of write to specific registers
; Repeats the same processing when an error occurs.
; After the specific sequence is correctly executed, restore
; the CPU clock to its setting before the self programming
MOV
MK0,#INT_MK0
; Restores interrupt mask flag
EI
BR StatusNormal
;---------------------------------------------------------------------
;END (abnormal termination processing); Perform processing to shift to
normal mode in order to return to normal processing
;---------------------------------------------------------------------
StatusError:
;---------------------------------------------------------------------
;END (normal termination processing)
;---------------------------------------------------------------------
StatusNormal: