UPD78F9500MA-CAC-A Datasheet, PDF (280/342 Pages) Renesas Technology Corp – 8-Bit Single-Chip Microcontrollers

CHAPTER 16 FLASH MEMORY
DI
ModeOnLoop:
MOV
MOV
MOV
MOV
MOV
PFS,#00H
PFCMD,#0A5H
FLPMC,#01H
FLPMC,#0FEH
FLPMC,#01H
; Configure settings so that the CPU clock ≥ 1 MHz
; Clears flash status register
; PFCMD register control
; FLPMC register control (sets value)
; FLPMC register control (inverts set value)
; Sets self programming mode via FLPMC register control (sets
; value)
NOP
HALT
BT PFS.0,$ModeOnLoop
; Checks completion of write to specific registers
; Repeats the same processing when an error occurs.
RET
;---------------------------------------------------------------------
; Processing to shift to normal mode
;---------------------------------------------------------------------
ModeOffLoop:
MOV
FLCMD,#00H
; Clears FLCMD register
MOV
PFS,#00H
; Clears flash status register
MOV
PFCMD,#0A5H ; PFCMD register control
MOV
FLPMC,#00H
; FLPMC register control (sets value)
MOV
FLPMC,#0FFH ; FLPMC register control (inverts set value)
MOV
FLPMC,#00H
; Sets normal mode via FLPMC register control (sets value)
BT PFS.0,$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
RET
;---------------------------------------------------------------------
;Data to be written
;---------------------------------------------------------------------
DataAdrTop:
DB
XXH
DB
XXH
DB
XXH
278
User’s Manual U18172EJ3V0UD