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
42 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
79 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
44 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] 90
91
92
93
I/O8 General Purpose I/O:
These pins may be used either as input, or output.
nRESET 115 IS RESET input:
This active low signal is used by the system to reset the chip. The
active low pulse should be at least 1s wide.
Symbol
128-Pin
VTQFP
Buffer Type Description