Overview Of Uart - Fujitsu MB90460 Series Hardware Manual

CHAPTER 17 UART
17.1

Overview of UART

UART is a general-purpose serial data communication interface for performing
synchronous or asynchronous (start-stop synchronization) communication with
external devices. The UART has a normal bidirectional communication function (normal
mode), additionally the master-slave communication function (multiprocessor mode) is
only available for the master system.
■ UART Functions (× 2)
●
UART functions
UART 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 17.1-1.
Table 17.1-1 UART Functions
Data buffer
Transfer mode
Baud rate
Data length
Signal mode
Reception error detection
Interrupt request
Master-slave communication
function (multiprocessor mode)
Note:
During clock synchronous transfer, start and stop bits are not added so only data is transferred in
UART.
468
Full-duplex, double buffering
• Clock synchronous
• Clock asynchronous (start-stop synchronization)
• A dedicated baud rate generator is provided. Eight settings can be selected
• An external clock can be input
• Internal clock (internal clocks supplied from 16-bit reload timer 0 can be used)
• 7 bits (in asynchronous normal mode only)
• 8 bits
Non-return to zero (NRZ)
• Framing error
• Overrun error
• Parity error (cannot be detected in multiprocessor mode)
• Reception interrupt (reception completion and reception error detection)
• Transmission interrupt (transmission completion)
• Extended intelligent I/O service (EI
reception interrupts
One-to-n communication (one master to n slaves) can be performed (this function is
supported only for the master system)
Function
2
OS) is available for both transmission and