Rohm LAPIS SEMICONDUCTOR ML620Q503, User Manual

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ML620Q503/Q504 User's Manual
Chapter 27 Flash Memory Control
FEUL620Q504 27- 15
27.3.7 Sample Program
This section lists sample programs for block erase/sector erase/1-word write (assuming that the flash segment
register is already set).
(1) Block erase/sector erase
LEA offset FLASHAH ; EA
←FLASHAH address
MOV R0, #0FAH ; Flash acceptor enable data
MOV R1, #0F5H ; Flash acceptor enable data
MOV R2, #01H (#02H) ; Block (sector) erase setting data
MOV R4, #(offset FLASHACP)&0FFH
MOV R5, #(offset FLASHACP)>>8 ; ER4
←FLASHACP address
MOV R6, #(offset FLASHCON)&0FFH
MOV R7, #(offset FLASHCON)>>8 ; ER6
←FLASHCON address
:
(Set the erase start block address in R9)
MARK:
SB FSELF ; Enable flash write/erase
LOOP:
ST
R0, [ER4] ; Enable flash acceptor
ST R1, [ER4] ; Enable flash acceptor
ST R9, [EA] ; Set block (sector) address
ST R2, [ER6] ; Start block (sector) erase
NOP ;
∗
Always set
NOP ;
∗
Always set
RB
FSELF ; Disable flash write/erase
(2) 1-word write
LEA offset FLASHAH
; EA←FLASHAH address
MOV R0, #0FAH ; Flash acceptor enable data
MOV R1, #0F5H ; Flash acceptor enable data
MOV R2, #02H ; Address increment data
MOV R3, #00H
MOV R4, #(offset FLASHACP)&0FFH
MOV R5, #(offset FLASHACP)>>8 ; ER4
←FLASHACP address
:
(Set the write start address in ER8)
(Set the write end address in ER12)
MARK:
SB FSELF ; Enable flash write/erase
ST
R0, [ER4] ; Enable flash acceptor
ST R1, [ER4] ; Enable flash acceptor
ST XR8, [EA] ; Set address and data, start 1-word write
NOP ;
∗
Always set
NOP ;
∗
Always set
L ER14, [ER8] ; Load data
CMP ER14, ER10 ; Check data
BNE ERROR ; Go to error routine on error
ADD ER8, ER2 ; Address increment
CMP ER8, ER12
BLE MARK ; Compare addresses
RB
FSELF ; Disable flash write/erase
Figure 27-6 Sample Programs for Write/Erase
[Note]
• Data erase/write during the program operation may cause the malfunction of program. Write to an address
unrelated to the operation of the program.
• Be sure to set the NOP instruction twice or more, following the block erase start instruction or the write to
FLASHD instruction.