Filter
Top Products
613
Chapter 32 USART (LIN / FIFO)
1.Overview
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
Item
Function
Data buffer Full-duplex
Serial Input 5 times oversampling in asynchronous mode
Transfer mode - Clock synchronous (start-stop synchronization and
start-stop-bit-option)
- Clock asynchronous (using start-, stop-bits)
Baud rate - 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
Data length - 7 bits (not in synchronous or LIN mode)
- 8 bits
Signal mode Non-return to zero (NRZ) and return to zero (RZ)
Start bit timing Clock synchronization to the falling edge of the start bit
in asynchronous mode
Reception error
detection
- Framing error
- Overrun error
- Parity error
Interrupt request - Reception interrupt (reception complete, reception
error detect, Bus-Idle, LIN-Synch-break detect)
- Transmission interrupt (transmission complete)