SN8P1602AX datasheet(35/94 Pages) SONIX

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SN8P1600

8-bit micro-controller

SONiX TECHNOLOGY CO., LTD

Page 35

Revision 1.94

4 ADDRESSING MODE

OVERVIEW

The SN8P1600 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 table.

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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