SN8A1702AX datasheet(47/145 Pages) SONIX

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SN8P1700

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

SONiX TECHNOLOGY CO., LTD

Page 47

Revision 1.94

4 ADDRESSING MODE

OVERVIEW

The SN8P1700 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.

MOV

A, #01H

B0MOV

Y, A

; To set Y = 1 for accessing RAM bank 1.

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.

MOV

A, #0FH

B0MOV

Y, A

; To set Y = 15 for accessing RAM bank 15.

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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