261
ABOV Semiconductor Co., Ltd.
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
3. On flash memory erase and write, it should be disabled the RXE bit of USInCR2 register.
Program Tip – byte write
ANL EO,#0xF8 ;Set DPTR0
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
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:
---
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