Overview Of Usart - Fujitsu MB96300 series Hardware Manual

CHAPTER 20 USART
20.1

Overview of 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. 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).
■ USART functions
The USART is a general-purpose serial data communication interface for transmitting serial data to and
receiving data from another CPU and peripheral devices. It has the functions listed in Table 20.1-1 "USART
functions".
Table 20.1-1 USART functions (1/2)
Data buffer
Serial Input
Transfer mode
Baud rate
Data length
Signal mode
Start bit timing
Reception error
detection
Interrupt request
Master-slave communication
function
(multiprocessor mode)
466
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)
Clock synchronization to the falling edge of the start bit in
asynchronous mode
• Framing error
• Overrun error
• Parity error (Not supported in Mode 1)
• receive interrupt (reception complete, reception error detect, LIN-
Synch-break detect)
• Transmission interrupt (transmission data empty)
• Interrupt request to ICU (LIN synch field detection) transmission
and reception support for DMA function.
One-to-n communication (one master to n slaves)
(This function is supported both for master and slave system).
MB96300 Super Series Hardware Manual
Function