SM89516B datasheet(21/49 Pages) SYNCMOS

21 / 49 page

SM89516B

8-Bit Micro-controller

64KB Flash

& 1KB RAM embedded

Specifications subject to change without notice contact your sales representatives for the most recent information.

ISSFD-M087

Ver D SM89516B 08/07/2015

- 21 -

MOVX @DPTR instrcution

DPTR

DBANK[7]

{RAMS1,RAMS0}

OME

Bank 4-7 (64B x 4)

Bank 8-11 (64B x 4)

Bank 12-15 (64B x 4)

768

Bytes

MOVX @Ri instrcution

A[9:0]

SEL

DPTR

{RAMS1,RAMS0,@Ri}

{DBANK[3:0],direct

address}

Chip selection of on-chip expanded RAM and Scratchpad RAM

READ

WRITE

Control Logic

Scratchpad RAM

Bank 0-3 (64B x 4)

On-chip 768B expanded RAM

1KB memory Space

MUX

Fig.3-4: Access on-chip expanded RAM and scratchpad RAM with both in single 1KB addressing space scheme

Mnemonic: DBANK

Address: 86h

Reset

BSE

BS3

BS2

BS1

BS0

01H

BSE: Set 1 to enable data banking function.

BS[3:0]: One is selected from 16 pieces of 64B data memory bank.

BSE

BS3

BS2

BS1

BS0

Mapped window : $40 - $7F

Logically addressed range in 1K memory space

Physical address

$000 – $03F

Scratchpad RAM

( $00 – $FF )

$040 – $07F

$080 – $0BF

$0C0 – $0FF

$100 – $13F

Expanded RAM

( $000 – $2FF)

$140 – $17F

$180 – $1BF

$1C0 – $1FF

$200 – $23F

$240 – $27F

$280 – $2BF

$2C0 – $2FF

$300 – $33F

$340 – $37F

$380 – $3BF

$3C0 – $3FF

Mapping is off

Table3-2: Bank mapping address

SM89516B Datasheet(PDF) 21 Page - SyncMOS Technologies,Inc

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