Overview Of Uart2, Uart3 - Fujitsu MB90390 Series Hardware Manual

CHAPTER 20 UART2, UART3
20.1

Overview of UART2, UART3

The UART2, UART3 with LIN (Local Interconnect Network) - Function is a general-
purpose serial data communication interface for performing synchronous or
asynchronous communication with external devices. UART2, UART3 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).
Please note that UART2, UART3 is not software compatible to the other UARTs.
■ UART2, UART3 Functions
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UART2, UART3 functions
UART2, UART3 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.
Table 20.1-1 UART2, UART3 Functions (1/2)
Item
Data buffer
Serial Input
Transfer mode
Baud rate
Data length
Signal mode
Start bit timing
Reception error detection
Interrupt request
338
Full-duplex
The machine clock performs oversampling 5 times and the receive value is
determined by the majority decision of sampling value (asynchronous mode
only)
• 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)
• Reception interrupt (reception complete, reception error detect, LIN-
Synch-break detect)
• Transmission interrupt (transmission data empty)
• Interrupt request to ICU (LIN synch field detection: LSYN)
• Both transmission and reception support for extended intelligent
2
I/O service (EI OS) and DMA function.
Function