MCP2210 datasheet(7/82 Pages) MICROCHIP

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 2011 Microchip Technology Inc.

DS22288A-page 7

MCP2210

1.6

GP Module

The GP module features nine I/O lines.

1.6.1

CONFIGURABLE PIN FUNCTIONS

The pins can be configured as:

• GPIO – individually configurable, general purpose

input or output

• Chip Select pins – used by the SPI module

• Alternate function pins – used for miscellaneous

features such as:

- SSPND – USB Suspend and Resume states

- USBCFG – indicates USB configuration

status

-LOWPWR – signals when the host does not

accept the requirements (presented during

enumeration) and the chip is not configured.

In this mode, the whole system powered from

the USB host should draw up to 100 mA.

- External Interrupt Input – used to count

external events

- SPI bus Release Request – used to request

SPI bus access from the MCP2210

- SPI bus Release Acknowledge – used to

acknowledge when the MCP2210 has

released the SPI bus

- LED – indicates SPI traffic led

1.6.1.1

GPIO Pins Function

The GP pins (if enabled for GPIO functionality) can be

used as digital inputs/outputs.

These pins can be read (both inputs and outputs) and

written (only the outputs).

1.6.1.2

Chip Select Pins Function

The GP pins (if enabled for the Chip Select functional-

ity) are controlled by the SPI module. Their Idle/Active

value is determined by the SPI transfer parameters.

1.6.1.3

SSPND Pin Function

The GP2 pin (if enabled for this functionality) reflects

the USB state (Suspend/Resume). The pin is active

‘low’ when the Suspend state has been issued by the

USB host.

Likewise, the pin drives ‘high’ after the Resume state is

achieved.

This pin allows the application to go into Low-Power

mode when USB communication is suspended, and

switches to a full active state when USB activity is

resumed.

1.6.1.4

USBCFG Pin Function

The GP5 pin (if enabled for this functionality) starts out

‘high’ during power-up or after Reset, and goes ‘low’

after the device successfully configures to the USB.

The pin will go ‘high’ when in Suspend mode and ‘low’

when the USB resumes.

1.6.1.5

LOWPWR Pin Function

The GP4 pin (if enabled for this functionality) starts out

‘low’ during power-up or after Reset, and goes ‘high’

after the device successfully configures to the USB.

The pin will go ‘low’ when in Suspend mode and ‘high’

when the USB resumes.

1.6.1.6

External Interrupt Input Pin Function

The GP4 pin (if enabled for this functionality) is used as

an interrupt input pin and it will count interrupt events

such as:

• Falling edges

• Rising edges

• Low-logic pulses

• High-logic pulses

1.6.1.7

SPI Bus Release Request Pin

Function

The GP8 pin (if enabled for this functionality) is used by

an external device to request the MCP2210 to release

the SPI bus. This way, more than one SPI master can

have access to the SPI slave chips on the bus. When

this pin is driven ‘low’, the MCP2210 will examine the

request and, based on the conditions and internal logic,

it might release the SPI bus. If there is an ongoing SPI

transfer taking place at the moment when an external

device requests the bus, MCP2210 will release it after

the transfer is completed or if the USB host cancels the

current SPI transfer.

1.6.1.8

SPI Bus Release Acknowledge Pin

Function

The GP7 pin (if enabled for this functionality) is used by

the MCP2210 to signal back if the SPI bus was

released. When a SPI bus release request is registered

by the MCP2210, based on the condition and internal

logic, the chip might release the bus. The bus is

released immediately if there is no SPI transfer taking

place, or it will do so after the current SPI transfer is

finished or cancelled by the USB host.

1.6.1.9

LED Pin Function

The GP3 pin (if enabled for this functionality) is used as

an SPI traffic indication. When an SPI transfer is taking

place (active state for this pin), this pin will be driven

‘low’. When there is no SPI traffic taking place, the pin

is in its inactive state or logic ‘high’.

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