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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AN2635 数据手册

On-Chip Routines Source Code

aix

dec

bne

1,sp

ReadData

;update pointer into FLASH (H:X)

;decrement ByteCount [E]

;loop until ByteCount=0

pula

;deallocate [E]

;# of bad [D] -> A, and deallocate

;if Verify OK, A = $00

coma

add

pula

ais

;$00 -> $FF if verify OK

;$FF -> $00; C=1 if verify was OK

;Checksum [C] -> A, and deallocate

;deallocate [A] and [B]

rts

;* RDVRRNG DONE ******************

;*********************************************************************

;* NAME: PRGRNGE

;* PURPOSE:

Program a FLASH address range which is maximum 32 bytes in the

same row. Bus frequency must be between 1.0MHz and 8.4MHz.

;* ENTRY CONDITIONS:

H:X contains a start address of the FLASH address range

LADDR:LADDR+1 contains a last address of the FLASH address range

DATA array contains the data to be programmed to the FLASH

(maximum 32 bytes)

CPUSPD contains a nearest integer of 4 x bus frequency (MHz)

;* EXIT CONDITIONS:

H:X contains a next FLASH address; I-bit set

;* SUBROUTINES CALLED:

;* VARIABLES READ: CPUSPD, LADDR:LADDR+1, DATA array

;* VARIABLES MODIFIED: LADDR(ByteCntr):LADDR+1(RamPntrLo)

The values are modified, but they are restored with original

values before exiting from this routine.

;* STACK SIZE: 9 bytes (including the call to this routine)

;* SIZE: 132 bytes

;* DESCRIPTION: EXECUTED OUT OF ROM

This routine can program the FLASH only in the same row.

Therefore, the total programing byte No. is maximum 32 bytes.

The COP is serviced in this routine. The first COP is serviced on

59 bus cycles after this routine is called in the user software.

However, there could still be a COP time out if the COP is not

serviced within a proper period in user software.

;*********************************************************************

PRGRNGE:

sei

;set I bit to mask interrupts

lda

LADDR

psha

lda

;save LADDR(hi) to stack [A]

LADDR+1

psha

pshx

;save LADDR(lo) to stack [B]

;calculate total # of bytes

; to be programmed

pula

sub

nega

inca

psha

;SLADDR (lo) -> A

LADDR+1

;SADDR(lo) - LADDR(lo) -> A

;LADDR(lo) - SADDR(lo) -> A

;change to 1-oriented vs 0-oriented

;[C] total remaining bytes to prog

; will decrement by LoopCOP on each

; pass through LoopPROG

StartProg:

On-Chip FLASH Programming Routines, Rev. 4

Freescale Semiconductor

1...27 28 293031 32 33...36

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