Datasheet

CHAPTER 16 FLASH MEMORY
User’s Manual U18172EJ3V0UD
271
An example of a program when the interrupt-disabled time (from erasure to blank check) should be minimized in
self programming mode is shown below.
;---------------------------------------------------------------------
;START
;---------------------------------------------------------------------
MOV B,#48 ; Specifies the number of times the erase command can be
; executed.
; (4.0 V to 5.5 V Time for executing block erasure 100 times)
FlashBlockErase:
; Sets erase command
MOV FLCMD,#03H ; Sets flash control command (block erase)
MOV FLAPH,#07H ; Sets number of block to be erased (block 7 is specified here)
MOV FLAPL,#00H ; Fixes FLAPL to “00H”
MOV FLAPHC,#07H ; Sets erase block compare number (same value as that of FLAPH)
MOV FLAPLC,#00H ; Fixes FLAPLC to “00H”
CALL !ModeOn ; Shift to self programming mode
EraseRetry:
; Execution of erase 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 $RetryCheck ; Checks erase error
; Performs abnormal termination processing when an error
; occurs.
CALL !ModeOff ; Shift to normal mode
; Sets blank check command
MOV FLCMD,#04H ; Sets flash control command (block blank check)
MOV FLAPH,#07H ; Sets block number for blank check (block 7 is specified here)
MOV FLAPL,#00H ; Fixes FLAPL to “00H”
MOV FLAPHC,#07H ; Sets blank check block compare number (same value as that of
; FLAPH)
MOV FLAPLC,#0FFH ; Fixes FLAPLC to “FFH”
CALL !ModeOn ; Shift to self programming mode
; Execution of blank check command
MOV PFS,#00H ; Clears flash status register
MOV WDTE,#0ACH ; Clears & restarts WDT
HALT ; Self programming is started
MOV A,PFS
<R>
<R>