XC164CS datasheet(39/71 Pages) INFINEON

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XC164

Derivatives

Functional Description

Data Sheet

V2.1, 2003-06

3.11

Asynchronous/Synchronous Serial Interfaces (ASC0/ASC1)

The Asynchronous/Synchronous Serial Interfaces ASC0/ASC1 (USARTs) provide serial

communication with other microcontrollers, processors, terminals or external peripheral

components. They are upward compatible with the serial ports of the Infineon 8-bit

microcontroller families and support full-duplex asynchronous communication and half-

duplex synchronous communication. A dedicated baud rate generator with a fractional

divider precisely generates all standard baud rates without oscillator tuning. For

transmission, reception, error handling, and baudrate detection 5 separate interrupt

vectors are provided.

In asynchronous mode, 8- or 9-bit data frames (with optional parity bit) are transmitted

or received, preceded by a start bit and terminated by one or two stop bits. For

multiprocessor communication, a mechanism to distinguish address from data bytes has

been included (8-bit data plus wake-up bit mode). IrDA data transmissions up to

115.2 kbit/s with fixed or programmable IrDA pulse width are supported.

In synchronous mode, bytes (8 bits) are transmitted or received synchronously to a shift

clock which is generated by the ASC0/1. The LSB is always shifted first.

In both modes, transmission and reception of data is FIFO-buffered. An autobaud

detection unit allows to detect asynchronous data frames with its baudrate and mode

with automatic initialization of the baudrate generator and the mode control bits.

A number of optional hardware error detection capabilities has been included to increase

the reliability of data transfers. A parity bit can automatically be generated on

transmission or be checked on reception. Framing error detection allows to recognize

data frames with missing stop bits. An overrun error will be generated, if the last

character received has not been read out of the receive buffer register at the time the

reception of a new character is complete.

Summary of Features

• Full-duplex asynchronous operating modes

– 8- or 9-bit data frames, LSB first, one or two stop bits, parity generation/checking

– Baudrate from 2.5 Mbit/s to 0.6 bit/s (@ 40 MHz)

– Multiprocessor mode for automatic address/data byte detection

– Support for IrDA data transmission/reception up to max. 115.2 kbit/s (@ 40 MHz)

– Loop-back capability

– Auto baudrate detection

• Half-duplex 8-bit synchronous operating mode at 5 Mbit/s to 406.9 bit/s (@ 40 MHz)

• Buffered transmitter/receiver with FIFO support (8 entries per direction)

• Loop-back option available for testing purposes

• Interrupt generation on transmitter buffer empty condition, last bit transmitted

condition, receive buffer full condition, error condition (frame, parity, overrun error),

start and end of an autobaud detection

Note: The serial interface ASC1 is not available in all derivatives of the XC164.

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