SN8A1702AX datasheet(35/112 Pages) SONIX

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Preliminary

SN8P1702A/SN8P1703A

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

SONiX TECHNOLOGY CO., LTD

Page 35

Revision 0.5

4 ADDRESSING MODE

OVERVIEW

The SN8P1702A/SN8P1703A provides three addressing modes to access RAM data, including immediate addressing

mode, directly addressing mode and indirectly address mode. The main purpose of the three different modes is

described in the following:

IMMEDIATE ADDRESSING MODE

The immediate addressing mode uses an immediate data to set up the location (MOV A, #I,

B0MOV M,#I) in ACC or

specific RAM.

Immediate addressing mode

MOV

A, #12H

; To set an immediate data 12H into ACC

DIRECTLY ADDRESSING MODE

The directly addressing mode uses address number to access memory location (MOV A,12H,

MOV 12H,A).

Directly addressing mode

B0MOV

A, 12H

; To get a content of location 12H of bank 0 and save in ACC

INDIRECTLY ADDRESSING MODE

The indirectly addressing mode is to set up an address in data pointer registers (Y/Z) and uses MOV instruction to

read/write data between ACC and @YZ register (MOV A,@YZ,

MOV @YZ,A).

Example: Indirectly addressing mode with @YZ register

CLR

; To clear Y register to access RAM bank 0.

B0MOV

Z, #12H

; To set an immediate data 12H into Z register.

B0MOV

A, @YZ

; Use data pointer @YZ reads a data from RAM location

; 012H into ACC.

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