W921C880 데이터 시트보기 (PDF) - Winbond

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W921C880

4-BIT MICROCONTROLLER

Winbond 

W921E880A/W921C880

6.2 RAM Memory Map

000H

000

SPECIAL CONTROL REG.

03FH

040H

04FH

050H

063

064

WORKING REG.

079

080

07FH

SERIAL CONTROL REG. 127

080H

128

STACK REG.

STACK REG.

(40H - FFH)

OR GENERAL REG.

0FFH

255

100H

256

SERIAL CONTROL REG.

OR GENERAL REG.

17FH

383

SERIAL CONTROL REG.

(50H - 14EH)

180H

384

GENERAL REG.

GENERAL REG.

1FFH

511

200H

512

BANK0 BANK1

3FFH

1023

6.2.1 Special Control Reg. Area

There are 64 reg. × 4 bits in the special control register area. All control registers such as the DTMF

Control Reg., System Clock Control Reg. ...etc. are in this area. Please refer to the Spesial Control

Reg. Format.

Bank Select Reg.

BKSR REG: (ADDRESS = 001H)

(Default data = 0H)

b3

b2

b1

b0

Reserved

Reserved

b1 b0 BANK NO.

00

0

01

1

1 0 Reserved

1 1 Reserved

The Bank Select Reg. can select the active bank. The memory size of each bank is 512*4 bits. Bank 0 and bank 1 are normal

SRAM.

- 11 -

Publication Release Date: July 1999

Revision A3

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