Overview Of Uart/Sio - Fujitsu F2MC-8FX Hardware Manual

CHAPTER 20 UART/SIO
20.1

Overview of UART/SIO

The UART/SIO is a general-purpose serial data communication interface. Serial data
transfers of variable-length data can be made with a synchronous or asynchronous
clock. The transfer format is NRZ. The transfer rate can be set with the dedicated baud
rate generator or external clock (in clock synchronous mode).
Functions of UART/SIO
The UART/SIO is capable of serial data transmission/reception (serial input/output) to and from another
CPU or peripheral device.
• Equipped with a full-duplex double buffer that allows 2-way full-duplex communication.
• The synchronous or asynchronous transfer mode can be selected.
• The optimum baud rate can be selected with the dedicated baud rate generator.
• The data length is variable; it can be set to 5 to 8 bits when no parity is used or to 6 to 9 bits when parity
is used. (See Table 20.1-1.)
• The serial data direction (endian) can be selected.
• The data transfer format is NRZ (Non-Return-to-Zero).
• Two operation modes (operation modes 0 and 1) are available.
Operation mode 0 operates as asynchronous clock mode (UART).
Operation mode 1 operates as clock synchronous mode (SIO).
Table 20.1-1 UART/SIO Operation Modes
Operation mode
328
Data length
No parity
5
6
0
7
8
5
6
1
7
8
Synchronization
mode
With parity
6
7
Asynchronous
8
9
-
-
Synchronous
-
-
Length of stop bit
1 bit or 2 bits
-