SN8A1702AX datasheet(20/112 Pages) SONIX

20 / 112 page

Preliminary

SN8P1702A/SN8P1703A

8-bit micro-controller build-in 12-bit ADC

SONiX TECHNOLOGY CO., LTD

Page 20

Revision 0.5

CHECKSUM CALCULATION

The ROM addresses 0004H~0007H and last address are reserved area. User should avoid these addresses

(0004H~0007H and last address) when calculate the Checksum value.

Example:

The demo program shows how to avoid 0004H~0007H when calculated Checksum from 00H to the end of

user’s code

MOV

A,#END_USER_CODE$L

B0MOV

END_ADDR1,A

; save low end address to end_addr1

MOV

A,#END_USER_CODE$M

B0MOV

END_ADDR2,A

; Save middle end address to end_addr2

CLR

; Set Y to 00H

CLR

; Set Z to 00H

@@:

CALL

YZ_CHECK

; Call function of check yz value

MOVC

;

B0BSET

; Clear C flag

ADD

DATA1,A

; Add A to Data1

MOV

A,R

ADC

DATA2,A

; Add R to Data2

JMP

END_CHECK

; Check if the YZ address = the end of code

AAA:

INCMS

;Z=Z+1

JMP

; If Z! = 00H calculate to next address

JMP

Y_ADD_1

; If Z=00H increase Y

END_CHECK:

MOV

A,END_ADDR1

CMPRS

A,Z

; Check if Z = low end address

JMP

AAA

; If Not jump to checksum calculate

MOV

A,END_ADDR2

CMPRS

A,Y

; If Yes, check if Y = middle end address

JMP

AAA

; If Not jump to checksum calculate

JMP

CHECKSUM_END

; If Yes checksum calculated is done.

YZ_CHECK:

;check if YZ=0004H

MOV

A,#04H

CMPRS

A,Z

;check if Z=04H

RET

;if Not return to checksum calculate

MOV

A,#00H

CMPRS

A,Y

;if Yes, check if Y=00H

RET

;if Not return to checksum calculate

INCMS

;if Yes, increase 4 to Z

INCMS

RET

;set YZ=0008H then return

Y_ADD_1:

INCMS

;increase Y

NOP

JMP

;jump to checksum calculate

CHECKSUM_END:

……….

END_USER_CODE:

;Label of program end

SN8A1702AX データシート(PDF) 20 Page - SONiX Technology Company

SN8A1702AX データシート(HTML) 20 Page - SONiX Technology Company

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

データシートダウンロード

リンク URL

SN8A1702AX データシート(PDF) 20 Page - SONiX Technology Company

SN8A1702AX データシート(HTML) 20 Page - SONiX Technology Company

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

データシート ダウンロード

リンク URL

データシートダウンロード