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參數(shù)資料
| 型號： | AN2635 |
| 廠商： | 飛思卡爾半導體(中國)有限公司 |
| 英文描述： | On-Chip FLASH Programming Routines |
| 中文描述： | 片上閃存編程例程 |
| 文件頁數(shù)： | 10/36頁 |
| 文件大小： | 150K |
| 代理商： | AN2635 |
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On-Chip FLASH Programming Routines, Rev. 4
10
Freescale Semiconductor
How to Use the Routines
Entry Condition
H:X — Contains the beginning address in a range.
LADDR — Contains the last address in a range.
A — When A contains $00, read data is sent out via PTA0 (send-out option is selected). When A contains
a non-zero value, read data is verified against the DATA array (verify option is selected).
DATA array — Contains data to be verified against FLASH data. For the
send-out option, the DATA array is not used.
PTA0 — When the send-out option is selected, this pin must be configured as an input and pulled up in
hardware and PTA0 must be initialized to 0.
Exit Condition
A — Contains a checksum value.
H:X — Contains the address of the next byte immediately after the range read.
C bit — Indicates the verify result (only applies to the verify option).
When the C bit is set, the verify succeeded.
When the C bit is cleared, the verify failed.
DATA array — Replaced with data read from FLASH when the verify option is selected.
Example 3: Verify Option
Example 3 shows how to use the verify option:
RDVRRNG equ $0384 ;LB8 RDVRRNG jump address
ldhx #$0000 ;Index offset into DATA array
lda #$AA ;Initial data value to store in array
Data_load:
coma
sta DATA,x ;Fill DATA array, 32 bytes data,
; to verify against programmed FLASH
aix #1 ; data (In this example verifying data
cphx #$20 ; is $55, $AA, $55, $AA....)
bne Data_load
ldhx #$C01F ;Load last address of range to
sthx LADDR ; LADDR
ldhx #$C000 ;Load beginning address of range
; to H:X
lda #$55 ;Write non-zero value to A to select
; the verify option
jsr RDVRRNG ;Call RDVRRNG routine
bcc Error ;If bit C is cleared, verify failed
; Take a proper action
; A contains a checksum value
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