SN8A1702AS datasheet(40/145 Pages) SONIX

40 / 145 page

SN8P1700

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

SONiX TECHNOLOGY CO., LTD

Page 40

Revision 1.94

ACCUMULATOR

The ACC is an 8-bits data register responsible for transferring or manipulating data between ALU and data memory. If

the result of operating is zero (Z) or there is carry (C or DC) occurrence, then these flags will be set to PFLAG register.

ACC is not in data memory (RAM), so ACC can’t be access by “B0MOV” instruction during the instant addressing

mode.

Example: Read and write ACC value.

; Read ACC data and store in BUF data memory

MOV

BUF, A

; Write a immediate data into ACC

MOV

A, #0FH

; Write ACC data from BUF data memory

MOV

A, BUF

The PUSH and POP instructions don’t store ACC value as any interrupt service executed. ACC must be exchanged to

another data memory defined by users. Thus, once interrupt occurs, these data must be stored in the data memory

based on the user’s program as follows.

Example: ACC and working registers protection.

ACCBUF

EQU

00H

; ACCBUF is ACC data buffer in bank 0.

INT_SERVICE:

B0XCH

A, ACCBUF

; B0XCH doesn’t change C, Z flag

PUSH.

; Push instruction

POP

; Pop instruction

B0XCH

A, ACCBUF

; Re-load ACC

RETI

; Exit interrupt service vector

Notice: To save and re-load ACC data must be used “B0XCH” instruction, or the PLAGE value maybe

modified by ACC.

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