UPD78F9500MA-CAC-A Datasheet, PDF (274/342 Pages) Renesas Technology Corp – 8-Bit Single-Chip Microcontrollers

CHAPTER 16 FLASH MEMORY
CMP
A,#00H
BNZ
$StatusError ; Checks blank check error
; Performs abnormal termination processing when an error occurs
CALL
!ModeOff
; Shift to normal mode
<R>
BR
RetryCheck:
DBNZ
StatusNormal
B,$EraseRetry
;---------------------------------------------------------------------
;END (abnormal termination processing); Perform processing to shift to
normal mode in order to return to normal processing
;---------------------------------------------------------------------
StatusError:
;---------------------------------------------------------------------
;END (normal termination processing)
;---------------------------------------------------------------------
StatusNormal:
;---------------------------------------------------------------------
;Processing to shift to self programming mode
;---------------------------------------------------------------------
ModeOn:
MOV
MK0,#11111111B ; Masks all interrupts
MOV
FLCMD,#00H
; Clears FLCMD register
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
272
User’s Manual U18172EJ3V0UD