XC888LM datasheet(92/144 Pages) INFINEON

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XC886/888CLM

Functional Description

Data Sheet

V0.9, 2006-12

– Interrupt enabling and corresponding flag

3.13

UART and UART1

The XC886/888 provides two Universal Asynchronous Receiver/Transmitter (UART and

UART1) modules for full-duplex asynchronous reception/transmission. Both are also

receive-buffered, i.e., they can commence reception of a second byte before a

previously received byte has been read from the receive register. However, if the first

byte still has not been read by the time reception of the second byte is complete, one of

the bytes will be lost.

Features

•

Full-duplex asynchronous modes

– 8-bit or 9-bit data frames, LSB first

– Fixed or variable baud rate

•

Receive buffered

•

Multiprocessor communication

•

Interrupt generation on the completion of a data transmission or reception

The UART modules can operate in the four modes shown in Table 29.

There are several ways to generate the baud rate clock for the serial port, depending on

the mode in which it is operating. In mode 0, the baud rate for the transfer is fixed at

PCLK/2. In mode 2, the baud rate is generated internally based on the UART input clock

and can be configured to either

PCLK/32 or fPCLK/64. For UART1 module, only fPCLK/64 is

available. The variable baud rate is set by the underflow rate on the dedicated baud-rate

generator. For UART module, the variable baud rate alternatively can be set by the

overflow rate on Timer 1.

3.13.1

Baud-Rate Generator

Both UART modules have their own dedicated baud-rate generator, which is based on

a programmable 8-bit reload value, and includes divider stages (i.e., prescaler and

Table 29

UART Modes

Operating Mode

Baud Rate

Mode 0: 8-bit shift register

PCLK/2

Mode 1: 8-bit shift UART

Variable

Mode 2: 9-bit shift UART

PCLK/32 or fPCLK/64

1) For UART1 module, the baud rate is fixed at f

PCLK/64.

Mode 3: 9-bit shift UART

Variable

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