Motorola MCF5281 사용자 설명서

14-26

MOTOROLA

 

Controller Area Network Transmit data output.  

This pin can also be configured as GPIO PAS2.

Controller Area Network Transmit data input.  

This pin can also be configured as GPIO PAS3.

The I

2

C module acts as a two-wire, bidirectional serial interface between the MCF5282 and

peripherals with an I

2

C interface (such as LCD controller, A-to-D converter, or D-to-A

converter). Devices connected to the I

2

C must have open-drain or open-collector outputs.

This bidirectional open-drain signal is the clock signal for the I

2

C interface.  Either it is

driven by the I

2

C module when the bus is in the master mode or it becomes the clock input

when the I

2

C is in the slave mode.  

This pin can also be configured as GPIO PAS0 or UTXD2.

This bidirectional open-drain signal is the data input/output for the I

2

C interface.  

This pin can also be configured as GPIO PAS1 or URXD2.

The signals in the following sections are used to transfer serial data between three UART
modules and external peripherals.

UTXD[2:0] are the transmitter serial data outputs for the UART modules. The output is
held high (mark condition) when the transmitter is disabled, idle, or in the local loopback
mode. Data is shifted out, lsb first, on this pin at the falling edge of the serial clock source.  

The UTXD[1:0] pins can be configured as GPIO ports PUA2 and PUA0. The UTXD2
output is offered on 3 pins and is a secondary function of the EMDC/ GPIO port PAS4 pin,
CANTX/GPIO port PAS2 pin, and SCL/GPIO port PAS0 pin.