Chapter 32 Usart (Lin / Fifo); Overview - Fujitsu MB91460 SERIES FR60 User Manual

Chapter 32 USART (LIN / FIFO)

1. Overview

This chapter explains the function and operation of the USART. The USART with LIN (Local Interconnect
Network) - Function is a general-purpose serial data communication interface for performing synchronous or
asynchronous communication with external devices. 16 bytes transmission and reception FIFOs are available
for selected channels.
The USART provides bidirectional communication function (normal mode), master-slave communication
function (multiprocessor mode in master/slave systems), and special features for LIN-bus systems (working
both as master or as slave device).
(Note) This chapter only lists the registers and addresses of USART04. Please refer to the IO-Map for the
addresses of the other USARTs.
■ USART Functions
USART is a general-purpose serial data communication interface for transmitting serial data to and receiving
data from another CPU or peripheral devices. It has the functions listed in
table 1-1.
Table 1-1 USART functions
Data buffer
Serial Input
Transfer mode
Baud rate
Data length
Signal mode
Start bit timing
Reception error
detection
Interrupt request
Item
Full-duplex
5 times oversampling in asynchronous mode
- Clock synchronous (start-stop synchronization and
start-stop-bit-option)
- Clock asynchronous (using start-, stop-bits)
- A dedicated baud rate generator is provided, which
consists of a 15-bit-reload counter
- An external clock can be input and also be adjusted
by the reload counter
- 7 bits (not in synchronous or LIN mode)
- 8 bits
Non-return to zero (NRZ) and return to zero (RZ)
Clock synchronization to the falling edge of the start bit
in asynchronous mode
- Framing error
- Overrun error
- Parity error
- Reception interrupt (reception complete, reception
error detect, Bus-Idle, LIN-Synch-break detect)
- Transmission interrupt (transmission complete)
Chapter 32 USART (LIN / FIFO)
Function
1.Overview
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