NEC 78K0S/KB1+ User Manual page 293

An example of the program that shifts the mode to self programming mode is shown below.
;----------------------------
;START
;----------------------------
MOV
MOV
<R>
MOV
DI
<R>
ModeOnLoop:
MOV
MOV
MOV
MOV
MOV
<R>
NOP
<R>
HALT
<R>
BT
;----------------------------
;END
;----------------------------
CHAPTER 19 FLASH MEMORY
MK0,#11111111B ; Masks all interrupts
MK1,#11111111B
FLCMD,#00H ; Clear FLCMD register
; Configure settings so that the CPU clock ≥ 1 MHz
PFS,#00H ; Clears flash status register
PFCMD,#0A5H ; PFCMD register control
FLPMC,#01H ; FLPMC register control (sets value)
FLPMC,#0FEH ; FLPMC register control (inverts set value)
FLPMC,#01H ; Sets self programming mode with FLPMC register
; control (sets value)
PFS.O,$ModeOnLoop ; Checks completion of write to specific registers
; Repeats the same processing when an error occurs
User's Manual U17446EJ3V1UD
293