USB2229 datasheet(16/28 Pages) MICROCHIP

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USB2229/USB2230

DS00002252A-page 16

 2005-2016 Microchip Technology Inc.

GPIO6, ROMEN,

Memory Address 16

GPIO6/ROMEN/

MA16

IPU

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

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 USB2229/USB2230 uses this

external bus for program execution.

When this pin is left unconnected or pulled high by a

weak pull-up resistor, the USB2229/USB2230 uses the

internal ROM for program execution.

I/O8

For Bank Switching support, MA16 addresses the

external 128k memory above the standard 64k range (the

upper 64k is mapped into the 64k addressable ROM

space)

General Purpose I/O

GPIO7

I/O8

This pin may be used either as input, edge sensitive

interrupt input, or output.

General Purpose I/O

Card Power

GPIO8/

CRD_PWR0

I/O8

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

sensitive interrupt input, or output.

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

General Purpose I/O

GPIO9

I/O8

This pin may be used either as input, edge sensitive

interrupt input, or output.

General Purpose I/O

Card Power

GPIO10/

CRD_PWR1

I/O8

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

sensitive interrupt input, or output.

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

General Purpose I/O

Card Power

GPIO11/

CRD_PWR2

I/O8

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

sensitive interrupt input, or output.

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

General Purpose I/O

GPIO12

I/O8

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

RESET input

nRESET

This active low signal is used by the system to reset the

chip. The active low pulse should be at least 1

s wide.

TEST Input

nTEST[1:0]

These signals are used for testing the chip. User should

normally tie them high externally, if the test function is not

used.

IrDA

IR MODE

IR_MODE

IR_MODE, declares the operating speed of the IR link.

IR Receive Data or

UART RX

IR_RXD/RX

IR_RXD, can be used as IR receiver or as the UART RX

line.

IR Transmit Data or

UART TX

IR_TXD/TX

IR_TXD, can be used as IR transmitter or as the UART

TX line.

DIGITAL POWER, GROUNDS, and NO CONNECTS

1.8v Digital Core

Power

VDD18

+1.8V Core power

All VDD18 pins must be connected together on the circuit

board.

TABLE 5-1:

USB2229/USB2230 PIN DESCRIPTIONS (CONTINUED)

Name

Symbol

Buffer Type

Description

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