GPBA02A

© Generalplus Technology Inc.

Proprietary & Confidential

3

JAN. 06, 2011

Version: 1.6

I/O Extender

1. GENERAL DESCRIPTION

GPBA02A, a newly invented I/O Extender for micro-controller

extends I/O pads usage. It equips with a standard SPI (Mode 0)

communication-processing block, and combines with 24 I/O ports.

With high-speed bit AND/OR/XOR capability for each bit in internal

configuration registers, I/Os’ status can be modified within fewer

host CPU cycles. These I/Os are provided with strong driver

ability to drive LED directly. More details are described as follow.

2. FEATURES

Operating Voltage

–

Chip operating voltage (VDD): 2.2V – 5.5V

–

I/O operating voltage (VDDIO): 2.2V – 5.5V

Standard SPI（Mode 0）Interface

–

4 pins for SPI communication

–

Chip select signal CSB as transmit enable signal

–

Serial clock SCK (max 6MHz) as data synchronization

signal for transmitting and receiving

–

Receives command and data from host via MOSI pin

–

Transmits data to host via MISO pin

24 I/Os

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24 bi-directional I/O lines

–

Users can set the corresponding registers to select pull

high/low resistors, or buffer/open-drain outputs.

–

Users can write the corresponding registers to execute

high-speed AND/OR/XOR function for each bit in those I/O

configuration registers.

Reset Management

–

Power on reset

–

Software control reset

3. BLOCK DIAGRAM