USB2227 datasheet(13/25 Pages) MICROCHIP

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 2007-2016 Microchip Technology Inc.

DS00002256A-page 13

USB2227/USB2228

GPIO5

110

I/O8

General Purpose I/O:

This pin may be used either as input, edge sensitive interrupt

input, or output.

GPIO6/

ROMEN

109

IPU

GPIO6, ROMEN:

This pin has an internal weak pull-up resistor that is enabled or

disabled by the state of nRESET.

The pull-up is enabled when nRESET is active.

The pull-up is disabled, when the nRESET is inactive (some clock

cycles later, after the rising edge of nRESET).

The state of this pin is latched internally on the rising edge of

nRESET to determine if internal or external program memory is

used.

The state latched is stored in ROMEN bit of GPIO_IN1 register.

I/O8

After the rising edge of nRESET, this pin may be used as GPIO6

or RXD.

When pulled low via an external weak pull-down resistor, an

external program memory should be connected to the memory

data bus. The USB2227/USB2228 uses this external bus for

program execution.

When this pin is left unconnected or pulled high by a weak pull-

up resistor, the USB2227/USB2228 uses the internal ROM for

program execution.

GPIO7

107

I/O8

General Purpose I/O:

This pin may be used either as input, edge sensitive interrupt

input, or output.

GPIO8/

CRD_PWR0

I/O8

General Purpose I/O or Card Power:

GPIO: This pin may be used either as input, edge sensitive

interrupt input, or output.

CRD_PWR: Card Power drive of 3.3V @ 100mA.

GPIO9

105

I/O8

General Purpose I/O:

This pin may be used either as input, edge sensitive interrupt

input, or output.

GPIO10/

CRD_PWR1

I/O8

General Purpose I/O or Card Power:

GPIO: These pins may be used either as input, edge sensitive

interrupt input, or output.

CRD_PWR: Card Power drive of 3.3V @ 100mA.

GPIO11/

CRD_PWR2

I/O8

General Purpose I/O or Card Power:

GPIO: This pin may be used either as input, edge sensitive

interrupt input, or output.

CRD_PWR: Card Power drive of 3.3V @ 200mA.

GPIO[15:12]

I/O8

General Purpose I/O:

These pins may be used either as input, or output.

nRESET

115

RESET input:

This active low signal is used by the system to reset the chip. The

active low pulse should be at least 1

s wide.

Symbol

128-Pin

VTQFP

Buffer Type

Description

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