NEC 78K0S/KA1+ User Manual page 298

An example of a program that performs a byte write in self programming mode is shown below.
;----------------------------
;START
;----------------------------
FlashWrite:
MOV FLCMD,#05H
MOV FLAPH,#07H
MOV FLAPL,#20H
MOV FLW,#10H
MOV PFS,#00H
MOV WDTE,#0ACH
HALT
MOV A,PFS
MOV CmdStatus,A
;----------------------------
;END
;----------------------------
298
CHAPTER 18 FLASH MEMORY
; Sets flash control command (byte write)
; Sets address to which data is to be written, with
; FLAPH (block 7 is specified here)
; Sets address to which data is to be written, with
; FLAPL (address 20H is specified here)
; Sets data to be written (10H is specified here)
; Clears flash status register
; Clears & restarts WDT
; Self programming is started
; Execution result is stored in variable
; (CmdStatus = 0: normal termination, other than 0: abnormal
; termination)
User's Manual U16898EJ3V0UD