AT89C5132-ROTUL datasheet(7/182 Pages) ATMEL

7 / 182 page

4173E–USB–09/07

AT89C5132

Table 7. UART Signal Description

Table 8. SPI Controller Signal Description

Table 9. TWI Controller Signal Description

Table 10. A/D Converter Signal Description

Signal

Name

Type

Description

Alternate

Function

RXD

I/O

Receive Serial Data

RXD sends and receives data in serial I/O mode 0 and receives data in serial

I/O modes 1, 2 and 3.

P3.0

TXD

Transmit Serial Data

TXD outputs the shift clock in serial I/O mode 0 and transmits data in serial I/O

modes 1, 2 and 3.

P3.1

Signal

Name

Type

Description

Alternate

Function

MISO

I/O

SPI Master Input Slave Output Data Line

When in master mode, MISO receives data from the slave peripheral. When in

slave mode, MISO outputs data to the master controller.

P4.0

MOSI

I/O

SPI Master Output Slave Input Data Line

When in master mode, MOSI outputs data to the slave peripheral. When in

slave mode, MOSI receives data from the master controller.

P4.1

SCK

I/O

SPI Clock Line

When in master mode, SCK outputs clock to the slave peripheral. When in

slave mode, SCK receives clock from the master controller.

P4.2

SPI Slave Select Line

When in controlled slave mode, SS enables the slave mode.

P4.3

Signal

Name

Type

Description

Alternate

Function

SCL

I/O

TWI Serial Clock

When TWI controller is in master mode, SCL outputs the serial clock to the

slave peripherals. When TWI controller is in slave mode, SCL receives clock

from the master controller.

P1.6

SDA

I/O

TWI Serial Data

SDA is the bidirectional Two Wire data line.

P1.7

Signal

Name

Type

Description

Alternate

Function

AIN1:0

A/D Converter Analog Inputs

AREFP

Analog Positive Voltage Reference Input

AREFN

Analog Negative Voltage Reference Input

This pin is internally connected to AVSS.

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