Abov MC96FM204, User Manual

Page: 159 / 172

MC96FM204/FM214
April 7, 2016 Ver. 1.8 159
The Byte Write program procedure in user program mode
1. Page buffer clear (FMCR=0x01)
2. Write data to page buffer
3. Set flash sector address register (FSADRH/FSADRM/FSADRL).
4. Set flash identification register (FIDR).
5. Check the UserID for to prevent the invalid work
(Note1).
6. Set flash mode control register (FMCR).
7. Erase verify
Note) 1. Please refer to the chapter
“Protection for Invalid Erase/Write”
2. Data of the address should be
“00H” before writing data to an address
Program Tip
–
byte write
MOV FMCR,#0x01 ;page buffer clear
NOP ;Dummy instruction, This instruction must be needed.
NOP ;Dummy instruction, This instruction must be needed.
NOP ;Dummy instruction, This instruction must be needed.
MOV
A,#5
MOV DPH,#0x80 ;Page Buffer Address is 8000H
MOV DPL,#0
MOVX @DPTR,A ;Write data to page buffer
MOV
A,#6
MOV DPH,#0x80
MOV DPL,#0x05
MOVX @DPTR,A ;Write data to page buffer
MOV FSADRH,#SAH ;Sector Address High Byte
MOV FSADRM,#SAM ;Sector Address Middle Byte
MOV FSADRL,#SAL ;Sector Address Low Byte
MOV FIDR,#0xA5 ;Identification value
MOV
A,#ID_DATA_1 ;Check the UserID(written by user)
CJNE A,UserID1,No_WriteErase ;This routine for UserID must be needed.
MOV
A,#ID_DATA_2
CJNE A,UserID2,No_WriteErase
MOV
FMCR,#0x03 ;Start flash write mode
NOP ;Dummy instruction, This instruction must be needed.
NOP ;Dummy instruction, This instruction must be needed.
NOP ;Dummy instruction, This instruction must be needed.
LJMP Write _verify
No_WriteErase:
MOV FIDR,#00H
MOV UserID1,#00H
MOV UserID2,#00H
---
Write_verify:
---
Verify_error:
---