Datasheet

CHAPTER 16 FLASH MEMORY
User’s Manual U18172EJ3V0UD
276
An example of a program when the interrupt-disabled time (from write to internal verify) should be minimized in self
programming mode is shown below.
;---------------------------------------------------------------------
;START
;---------------------------------------------------------------------
; Sets write command
FlashWrite:
MOVW HL,#DataAdrTop ; Sets address at which data to be written is located
MOVW DE,#WriteAdr ; Sets address at which data is to be written
FlashWriteLoop:
MOV FLCMD,#05H ; Sets flash control command (byte write)
MOV A,D
MOV FLAPH,A ; Sets address at which data is to be written
MOV A,E
MOV FLAPL,A ; Sets address at which data is to be written
MOV A,[HL]
MOV FLW,A ; Sets data to be written
CALL !ModeOn ; Shift to self programming mode
; Execution of write command
MOV PFS,#00H ; Clears flash status register
MOV WDTE,#0ACH ; Clears & restarts WDT
HALT ; Self programming is started
MOV A,PFS
CMP A,#00H
BNZ $StatusError ; Checks write error
; Performs abnormal termination processing when an error
; occurs.
CALL !ModeOff ; Shift to normal mode
MOV MK0,#INT_MK0 ; Restores interrupt mask flag
EI
; Judgment of writing all data
INCW HL ; Address at which data to be written is located + 1
MOVW AX,HL
CMPW AX,#DataAdrBtm ; Performs internal verify processing
BNC $FlashVerify ; if write of all data is completed
INCW DE ; Address at which data is to be written + 1
BR FlashWriteLoop
; Setting internal verify command