UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 320

• Manufacturer Part Number: UPD78F9222MC(T)-5A4-A
• Description: 8BIT MCU, 4K FLASH, 256B RAM, 78F9222
• Manufacturer: NEC

Specifications of UPD78F9222MC(T)-5A4-A

• Controller Family/series: UPD78
• No. Of I/o's: 17
• Ram Memory Size: 256Byte
• Cpu Speed: 10MHz
• No. Of Timers: 4
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

320
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
;---------------------------------------------------------------------
FlashWrite:
FlashWriteLoop:
; Sets write command
MOVW
MOVW
MOV
MOV
MOV
MOV
MOV
MOV
MOV
CALL
; Execution of write command
MOV
MOV
HALT
MOV
CMP
BNZ
CALL
MOV
MOV
EI
; Judgment of writing all data
INCW
MOVW
CMPW
BNC
INCW
BR
HL,#DataAdrTop ; Sets address at which data to be written is located
DE,#WriteAdr
FLCMD,#05H
A,D
FLAPH,A
A,E
FLAPL,A
A,[HL]
FLW,A
!ModeOn
PFS,#00H
WDTE,#0ACH
A,PFS
A,#00H
$StatusError
!ModeOff
MK0,#INT_MK0
MK1,#INT_MK1
HL
AX,HL
AX,#DataAdrBtm ; Performs internal verify processing
$FlashVerify
DE
FlashWriteLoop
; Sets address at which data is to be written
; Sets flash control command (byte write)
; Sets address at which data is to be written
; Sets address at which data is to be written
; Sets data to be written
; Shift to self programming mode
; Clears flash status register
; Clears & restarts WDT
; Self programming is started
; Checks write error
; Performs abnormal termination processing when an error
; occurs.
; Shift to normal mode
; Restores interrupt mask flag
; Address at which data to be written is located + 1
; if write of all data is completed
; Address at which data is to be written + 1
CHAPTER 18 FLASH MEMORY
User’s Manual U16898EJ5V0UD