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CHAPTER 18 UART
18.1 Overview of UART
18.1
Overview of UART
UART is a general purpose serial data communication interface for synchronous or
asynchronous (start-stop synchronization) communications with external devices. Not
only the typical function of bidirectional communication (normal mode), but also the
function of master/slave communication (multiprocessor mode: only supported master
side) are supported.
■ UART Function
●
UART function
UART, or a general serial data communication interface that sends and receives serial data to and from
other CPU and peripherals, has the functions listed in Table 18.1-1.
Table 18.1-1 UART Function
Data buffer
Transfer mode
Baud rate
Data length
Signal type
Detection of receive error
Interrupt request
Master/slave type communication
function (multi processor mode)
Note:
At clock synchronous transfer, data is transferred alone with neither start nor stop bit added.
386
Full-duplicate double-buffer
• Clock synchronous (No start/stop bit)
• Clock asynchronous (start-stop synchronization to clock)
• Dedicate baud-rate generator
• External clock input enabled.
• 8 bits or 7 bits (in the asynchronous normal mode only)
• 1 to 8 bit (s) (synchronous mode only)
NRZ (Non Return to Zero) type
• Framing error
• Overrun error
• Parity error (Not supported in operation mode 1)
• Receive interrupt (receive, detection of receive error)
• Transmission interrupt (transmission complete)
• Support extended intelligent I/O service (EI
transmission and receive
Capable of 1 (master) to n (slaves) communication
(available just as master)
FUJITSU MICROELECTRONICS LIMITED
MB90335 Series
Functions
2
OS) and μDMAC transfer for both
CM44-10137-6E
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