GPBA01B datasheet(9/29 Pages) GENERALPLUS

9 / 29 page

GPBA01B

Proprietary & Confidential

MAY 28, 2007

Version: 1.1

After step 9, the status of BEXA and BEXB are as following

MC[1:0]

AD[7:0]

BEXA

OUT

MC[1:0]

AD[7:0]

MPU

MC[1:0]

AD[7:0]

BEXB

VID =3

SID=5

VID =5

SID=5

active!!

6.5.2. Configuration

BEX has two modes: memory extender (major mode), and I/O

extender.

As we use the BEX, we need to set configuration

Writing to B[7:5] of

$0023H establishes the GPBA01B configurations.

When GPBA01B works as memory extender, it can extend from 1

to 3 memories, depending configuration.

Please refer to

chapter.

When using as I/O extender, P0, P1 and P2 are bi-directional pins.

The value written to B[4:0] of $0023H defines directions.

Logical

“1” stands for output and logical “0” stands for input.

Specially,

P55 ( WE ) and OSCO (

OE ) cannot operate in input direction.

6.6. Clock Divider

Writing to PS [1:0] (B [5:4] of register $0021H) and CDP [7:0]

(register $0022H) sets the frequency of CLKO out.

Writing a

logical one to OSCE (B7 of register $0021H) makes the crystal

oscillator enable.

Writing a logical zero to OSCE makes the

crystal oscillator disable, and reduces power consumption.

When

both OSCE and CLKOE are logical one, CLKO is enabled.

Div ide m

Div ide n

Div ide 2

CLKO

Cry stal

oscillator

OSCO

OSCE

CLKOE

OSCO

CLKO

Freq1

Freq2

Freq1 is dependent on crystal.

Freq2 = freq1/ (m*n*2), where n=2^PS [1:0],

m=256-(CDP [7:0] value)

OSCO is available in CFG0 and CFG1

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