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SN8P26042AKG

8-Bit Micro-Controller

Sonix Technology Co., Ltd 

SN8P2604A

8-Bit Micro-Controller

2.1.1.5 CHECKSUM CALCULATION

The last ROM address are reserved area. User should avoid these addresses (last address) when calculate the

Checksum value.

¾ Example: The demo program shows how to calculated Checksum from 00H to the end of user’s code.

@@:

AAA:

END_CHECK:

MOV

B0MOV

MOV

B0MOV

CLR

CLR

MOVC

B0BSET

ADD

MOV

ADC

JMP

INCMS

JMP

JMP

MOV

CMPRS

JMP

MOV

CMPRS

JMP

JMP

A,#END_USER_CODE$L

END_ADDR1, A

; Save low end address to end_addr1

A,#END_USER_CODE$M

END_ADDR2, A

; Save middle end address to end_addr2

Y

; Set Y to 00H

Z

; Set Z to 00H

FC

DATA1, A

A, R

DATA2, A

END_CHECK

Z

@B

Y_ADD_1

A, END_ADDR1

A, Z

AAA

A, END_ADDR2

A, Y

AAA

CHECKSUM_END

; Clear C flag

; Add A to Data1

; Add R to Data2

; Check if the YZ address = the end of code

; Z=Z+1

; If Z != 00H calculate to next address

; If Z = 00H increase Y

; Check if Z = low end address

; If Not jump to checksum calculate

; If Yes, check if Y = middle end address

; If Not jump to checksum calculate

; If Yes checksum calculated is done.

Y_ADD_1:

INCMS Y

NOP

JMP

@B

CHECKSUM_END:

…

…

END_USER_CODE:

; Increase Y

; Jump to checksum calculate

; Label of program end

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