GPUSB101A datasheet(8/37 Pages) GENERALPLUS

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GPUSB101A

Proprietary & Confidential

Sep 24, 2014

Version: 1.4

6. FUNCTIONAL DESCRIPTIONS

6.1. Power Saving Mode

The GPUSB101A features a power saving mode(or called standby

mode) for low power application. To enter standby mode, the

desired key wakeup port(IOA[7:0]) must be configured to input first.

And read the P_IOA_Data to latch the IOA state before entering

the standby mode.

6.2. PLL (Phase Lock Loop)

The purpose of PLL is to provide stable output frequency which

reference a base frequency (from crystal).

The PLL output

frequency is 48MHz. It is used for USB device core.

6.3. I/O

Three I/O ports are built in GPUSB101A - PortA, PortB and PortC,

total has 20 bit-programmable I/Os.

The PortA is a general

purpose I/O with programmable wakeup capability, i.e. IOA [7:0] is

the key wakeup port. To activate key wakeup function, latch data

on P_IOA_Data and enable the key wakeup function. Wakeup is

triggered when the PortA state is different from at the time latched.

Furthermore, the I/O ports can be operated at 5V level(only PortA

and PortB), higher than the CPU core which is a 3.3V level system.

Suppose system operating voltage is running at 3.3V, then

IOVDD5 (power for I/O) operates from 3.3V to 5.5V. In such

condition, the I/O pad is capable of operating from 0V through

IOVDD5. The following diagram is an I/O schematic. Although

data can be written into the same register through Port_Data and

Port_Buffer, they can be read from different places, Buffer (R) and

Data (R).

Control

logic

pull high

pull low

Pin pad

Buffer(R)

Data(R)

Port_Data(W)

Port_Buffer(W)

Port_DIR(R/W)

Port_ATTR(R/W)

In addition to a general purpose I/O port function, PortA/B/C also

shares some special functions. A summary of PortA/B/C special

functions is listed as follows:

Port A

IOA[7]

IOA[6]

IOA[5]

IOA[4]

IOA[3]

IOA[2]

IOA[1]

IOA[0]

Wakeup

Parallel

para_int

para_wrb

para_rdb

para_csb

para_cdb

Port B

IOB[7]

IOB [6]

IOB[5]

IOB [4]

IOB [3]

IOB [2]

IOB [1]

IOB [0]

Parallel

para_data[7]

para_data[6]

para_data[5]

para_data[4]

para_data[3]

para_data[2]

para_data[1]

para_data[0]

SPI slave

spi_rxd

spi_txd

spi_clk

spi_csb

Port C

IOC [3]

IOC [2]

IOC [1]

IOC [0]

SPI master

spi_rxd

spi_txd

spi_clk

spi_csb

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