Datasheet > AN2635

AN2635

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
飞思卡尔 - FREESCALE		闪存
页数	文件大小	规格书
36页	149K
描述
On-Chip FLASH Programming Routines

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数据手册

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AN2635 数据手册

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

lda #$AA

;Index offset into DATA array

;Initial data value to store in array

Data_load:

coma

sta DATA,x

;Fill DATA array, 32 bytes data,

; to verify against programmed FLASH

; data (In this example verifying data

; is $55, $AA, $55, $AA....)

aix #1

cphx #$20

bne Data_load

ldhx #$C01F

sthx LADDR

ldhx #$C000

;Load last address of range to

; LADDR

;Load beginning address of range

; to H:X

lda #$55

;Write non-zero value to A to select

; the verify option

jsr RDVRRNG

bcc Error

;Call RDVRRNG routine

;If bit C is cleared, verify failed

; Take a proper action

; A contains a checksum value

On-Chip FLASH Programming Routines, Rev. 4

Freescale Semiconductor

1...7 8 91011 12 13...36

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