SN8P1602A datasheet(26/76 Pages) SONIX

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SN8P1602B

8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 26

Version 1.1

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 saved to

other data memories.

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 by B0XCH command, and which will not

affect the PFLAG again.

RETI

; Exit interrupt service vector

Note: To save and re-load ACC data, users must use “B0XCH” instruction, or else the PFLAG Register

might be modified by ACC operation.

SN8P1602A Datasheet(PDF) 26 Page - SONiX Technology Company

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