GPBA02A datasheet(8/21 Pages) GENERALPLUS

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GPBA02A

Proprietary & Confidential

JAN. 06, 2011

Version: 1.6

5.1.4. Waveform of SPI Pins

The following diagram shows that when the host writes data into

or reads data from this I/O extender, it will send a low voltage

chip-selecting signal on CSB pin.

And the host needs to

generate 16 clock pulses on SCK pin for a data frame’s

synchronization. The CSB should keep in low voltage until this

data frame transmission is done (It is suggested the CSB should

keep in low voltage at least half a SCK clock cycle after the 16th

pulse). And when the host starts a new data frame transmission,

the CSB signal should change from high voltage to low voltage.

It means that the CSB cannot maintain in low voltage even if the

host transmits two or more data frames continuously. The CSB

needs shift to high voltage between every two data frames

transmission.

The I/O extender receives command-byte and

writing-byte via MOSI pin, and transmits reading-byte via MISO

pin.

5.2. Control Registers

As shown in the registers list, the address can be represented by

6 bits binary data (suppose to be B [5:0]). For the normal I/O

operation, users can write data into address 0xH (B[5:4]=00)

registers (BUFA/B/C, DIRA/B/C and ATTA/B/C) to achieve various

IO functions, and read data from address 0xH (AB5-4=00)

registers (BUFA/B/C, DIRA/B/C and ATTA/B/C) and ports

(DATA/B/C) to obtain register and IO ports states.

In order to speed up I/O operation, GPBA02A provides some

special designed registers to help users to reduce operation time.

Users can write data to address 1xH (AB5-4=01) registers

(BUFA/B/C, DIRA/B/C and ATTA/B/C) to speed up AND operation

for these corresponding 0xH registers. Users can write data to

address 2xH (AB5-4=10) registers (BUFA/B/C, DIRA/B/C and

ATTA/B/C) to speed up OR operation for these corresponding 0xH

registers.

Users can write data to address 3xH (AB5-4=11)

registers (BUFA/B/C, DIRA/B/C and ATTA/B/C) to speed up XOR

operation for these corresponding 0xH registers.

Control registers list:

Function

Address

Comment

Default

00H(R/W)

PA7

PA6

PA5

PA4

PA3

PA2

PA1

PA0

BUFA

01H(R/W)

PB7

PB6

PB5

PB4

PB3

PB2

PB1

PB0

BUFB

02H(R/W)

PC7

PC6

PC5

PC4

PC3

PC2

PC1

PC0

BUFC

03H(R/W)

N/A

04H(R/W)

PA7

PA6

PA5

PA4

PA3

PA2

PA1

PA0

DIRA

05H(R/W)

PB7

PB6

PB5

PB4

PB3

PB2

PB1

PB0

DIRB

06H(R/W)

PC7

PC6

PC5

PC4

PC3

PC2

PC1

PC0

DIRC

07H(R/W)

N/A

08H(R/W)

PA7

PA6

PA5

PA4

PA3

PA2

PA1

PA0

ATTA

09H(R/W)

PB7

PB6

PB5

PB4

PB3

PB2

PB1

PB0

ATTB

0AH(R/W)

PC7

PC6

PC5

PC4

PC3

PC2

PC1

PC0

ATTC

IO Port

0BH(R/W)

N/A

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