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CHAPTER 14 UART0
14.1
Overview of UART0
The UART0 is a general-purpose serial-data communication interface for synchronous
or asynchronous communication with external devices.
• Incorporates a bidirectional communication function (clock synchronous and
asynchronous modes)
• The master/slave communication function (multiprocessor mode) is incorporated.
• Capable of generating an interrupt request upon transmission, reception, or detection
of a reception error.
• Supports expansion intelligent I/O service (EI
I Functions of UART0
G
Functions of UART0
The UART0 is a general-purpose serial data communication interface to exchange serial data with external
devices. Its functions are listed in Table 14.1-1.
Table 14.1-1 Function of UART0
Detection of receive error
Master/slave type communication
function (multi processor mode)
Note:
At clock synchronous transfer, data is transferred alone with neither start nor stop bit added.
382
Data buffer
Transfer mode
Baud rate
Data length
Signal type
interrupt request
2
OS)
Function
Full-duplicate double-buffer
• Synchronous to clock (without start bit/stop bit and parity
bit)
• Asynchronous (start-stop synchronization to clock)
• Special-purpose baud-rate generator, selectable 10 types
• Any baud rate can be set by external clock.
• A clock supplied from the internal clock (16-bit reload timer
0) can be used.
• 7 bits (for asynchronous normal mode only)
• 8 bits
NRZ (Non Return to Zero) type
• Framing error
• Overrun error
• Parity error (Not supported in operation mode 1)
• Detection of receive error
• Transmission interrupt (Transmission)
• Both the transmission and reception support EI
This function enables communications between 1 (only use
master) and n (slave) (This function is used only as the master
side)
2
OS.
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