Table of Contents
Advertisement
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).
■ 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 asynchronous clock mode (UART).
Operation mode 1 operates as clock synchronous mode (SIO).
Table 22.1-1 UART/SIO Operation Modes
Operation mode
No parity
0
1
456
Data length
With parity
5
6
6
7
7
8
8
9
5
-
6
-
7
-
8
-
FUJITSU SEMICONDUCTOR LIMITED
MB95630H Series
Synchronization
Length of stop bit
mode
Asynchronous
Synchronous
1 bit or 2 bits
-
MN702-00009-1v0-E
Advertisement
Table of Contents
