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| 型號： | EM78P809NP |
| 廠商： | ELAN Microelctronics Corp . |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁數(shù)： | 38/75頁 |
| 文件大?。?/td> | 531K |
| 代理商： | EM78P809NP |
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EM78P809N
8-Bit Microcontroller
34
Product Specification (V1.0) 07.26.2005
(This specification is subject to change without further notice)
In Universal Asynchronous Receiver Transmitter (UART), each transmitted or received
character is individually synchronized by framing it with a start bit and stop bit.
Full duplex data transfer is possible since the UART has independent transmit and
receive sections. Double buffering for both sections allows the UART to be
programmed for continuous data transfer.
The figure below shows the general format of one character sent or received. The
communication channel is normally held in the marked state (high). Character
transmission or reception starts with a transition to the space state (low).
The first bit transmitted or received is the start bit (low). It is followed by the data bits, in
which the least significant bit (LSB) comes first. The data bits are followed by the parity
bit. If present, then the stop bit or bits (high) confirm the end of the frame.
In receiving, the UART synchronizes on the falling edge of the start bit. When two or
three “0” are detected during three samples, it is recognized as normal start bit and the
receiving operation is started.
Fig. 12. DATA Format in UART
4.7.1 UART MODE:
There are three UART modes. Mode 1 (7 bits data) and Mode 2 (8 bits data) allow the
addition of a parity bit. The parity bit addition is not available in Mode 3. The Figure
below shows the data format in each mode.
UMODE PRE
0 0 0
0 0 1
0 1 0
0 1 1
1 0 X
1
2
3
4
5
11
10
9
8
7
6
START
STOP
7 bits DATA
START
STOP
7 bits DATA
Parity
START
STOP
8 bits DATA
START
STOP
8 bits DATA
Parity
START
STOP
9 bits DATA
Mode 1
Mode 3
Mode 2
Fig. 13. UART Mode
START
bit
D0
D1
D2
Dn
Parity
bit
STOP
bit
1 bit
7 or 8 bits
One character or frame
1 bit
1 bits
Idle state
(mark)
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