MB95630H Series
456 FUJITSU SEMICONDUCTOR LIMITED MN702-00009-2v0-E
CHAPTER 22 UART/SIO
22.1 Overview
22.1 Overview
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 (SIO)).
■ 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 bit to 8 bit when no parity is used or to 6 bit to
9 bit when parity is used. (See Table 22.1-1.)
• 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 clock asynchronous mode (UART).
Operation mode 1 operates as clock synchronous mode (SIO).
Table 22.1-1 UART/SIO Operation Modes
Operation mode
Data length
Synchronization
mode
Length of stop bit
No parity With parity
0
56
Asynchronous 1 bit or 2 bits
67
78
89
1
5-
Synchronous -
6-
7-
8-
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