SN8A1702AX datasheet(35/145 Pages) SONIX

35 / 145 page

SN8P1700

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

SONiX TECHNOLOGY CO., LTD

Page 35

Revision 1.94

RAM BANK SELECTION

The RBANK is a 1-bit register located at 87H in RAM bank 0. The user can access RAM data by using this register

pointing to working RAM bank for ACC to read/write RAM data.

RBANK initial value = xxxx xxx0

087H

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

RBANK

RBNKS0

R/W

RBNKSn: RAM bank selecting control bit. 0 = bank 0, 1 = bank 1.

Example: RAM bank selecting.

; BANK 0

CLR

RBANK

; b0bclr FRBNKS0

; BANK 1

MOV

A, #1

; b0bset FRBNKS0

B0MOV

RBANK, A

Note: “B0MOV” instruction can access the RAM of bank 0 in other bank situation directly.

Example: Access RAM bank 0 in RAM bank 1.

; BANK 1

B0BSET

RBNKS0

; Get into RAM bank 1

B0MOV

A, BUF0

; Read BUF0 data. BUF0 is in RAM bank0.

MOV

BUF1, A

; Write BUF0 data to BUF1. BUF1 is in RAM bank1.

MOV

A, BUF1

; Read BUF1(bank1) data and store in ACC.

B0MOV

BUF0, A

; Write ACC data to BUF0(bank0).

Under bank 1 situation, using “B0MOV” instruction is an easy way to access RAM bank 0 data. User can make a habit

to read/write system register (0087H~00FFH). Then user can access system registers without switching RAM bank.

Example: To Access the system registers in bank 1 situation.

; BANK 1

B0BSET

RBNKS0

; Switch the Ram Bank into bank 1

MOV

A, #0FFH

; Set all pins of P1 to be logic high.

B0MOV

P1, A

; Operate the bank 0 special register by the b0mov instruction

; while the RAM system in the bank1.

B0MOV

A, P0

; Read P0 data in the Bank 0 and store into BUF1 in the bank 1.

MOV

BUF1, A

;

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