UPSD3422 datasheet(14/293 Pages) STMICROELECTRONICS

14 / 293 page

Pin descriptions

uPSD34xx

14/293

P3.0

RxD0

I/O

General I/O port pin

UART0 Receive

(RxD0)

P3.1

TXD0

I/O

General I/O port pin

UART0 Transmit

(TxD0)

P3.2

EXINT0

TGO

I/O

General I/O port pin

Interrupt 0 input

(EXTINT0)/Timer 0

gate control (TG0)

P3.3

INT1

I/O

General I/O port pin

Interrupt 1 input

(EXTINT1)/Timer 1

gate control (TG1)

P3.4

I/O

General I/O port pin Counter 0 input (C0)

P3.5

I/O

General I/O port pin Counter 1 input (C1)

P3.6

SDA

I/O

General I/O port pin

I2C Bus serial data

(I2CSDA)

P3.7

SCL

I/O

General I/O port pin

I2C Bus clock

(I2CSCL)

P4.0

TCM0

I/O

General I/O port pin

Program Counter

Array0 PCA0-TCM0

Timer 2 Count input

(T2)

P4.1

T2X

TCM1

I/O

General I/O port pin PCA0-TCM1

Timer 2 Trigger

input (T2X)

P4.2

RXD1

TCM2

I/O

General I/O port pin PCA0-TCM2

UART1 or IrDA

Receive (RxD1)

P4.3

TXD1

PCACLK0

I/O

General I/O port pin PCACLK0

UART1 or IrDA

Transmit (TxD1)

P4.4

SPICLK

TCM3

I/O

General I/O port pin

Program Counter

Array1 PCA1-TCM3

SPI Clock Out

(SPICLK)

P4.5

SPIRXD

TCM4

I/O

General I/O port pin PCA1-TCM4

SPI Receive

(SPIRxD)

P4.6

SPITXD

I/O

General I/O port pin PCA1-TCM5

SPI Transmit

(SPITxD)

P4.7

SPISEL

PCACLK1

I/O

General I/O port pin PCACLK1

SPI Slave Select

(SPISEL)

AVREF

N/A

Reference Voltage

input for ADC.

Connect AVREF to

VCC if the ADC is

not used.

N/A

READ Signal,

external bus

N/A

WRITE Signal,

external bus

Table 2.

Pin definitions

Port Pin

Signal

Name

80-Pin

No.

52-Pin

No.(1)

In/Out

Function

Basic

Alternate 1

Alternate 2

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