NEC 78K0S/KA1+ User Manual page 286

An example of the program that shifts the mode to self programming mode is shown below.
;----------------------------
;START
;----------------------------
MOV MK0,#11111111B
MOV MK1,#11111111B
DI
ModeOnLoop:
MOV PFS,#00H
MOV PFCMD,#0A5H
MOV FLPMC,#01H
MOV FLPMC,#0FEH
MOV FLPMC,#01H
MOV A,PFS
CMP A,#00H
BNZ $ModeOnLoop
;----------------------------
;END
;----------------------------
286
CHAPTER 18 FLASH MEMORY
; Masks all interrupts
; Clears flash status register
; PFCMD register control
; FLPMC register control (sets value)
; FLPMC register control (inverts set value)
; Sets self programming mode with FLPMC register
; control (sets value)
; Checks completion of write to specific registers
; Repeats the same processing when an error occurs.
User's Manual U16898EJ3V0UD