SN8P1602AS datasheet(28/94 Pages) SONIX

28 / 94 page

SN8P1600

8-bit micro-controller

SONiX TECHNOLOGY CO., LTD

Page 28

Revision 1.94

ACCUMULATOR

The ACC is an 8-bit 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 system doesn’t store ACC and PFLAG value when interrupt executed. ACC and PFLAG data must be exchanged

to other data memories 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: Protect ACC and working registers.

ACCBUF

EQU

00H

; ACCBUF is ACC data buffer.

PFLAGBUF

EQU

01H

; PFLAGBUF is PFLAG data buffer.

INT_SERVICE:

B0XCH

A, ACCBUF

; Store ACC value

B0MOV

A, PFLAG

; Store PFLAG value

B0MOV

PFLAGBUF,A

B0MOV

A, PFLAGBUF

; Re-load PFLAG value

B0MOV

PFLAG,A

B0XCH

A, ACCBUF

; Re-load ACC

RETI

; Exit interrupt service vector

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

modified by ACC.

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