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參數(shù)資料
| 型號(hào)： | CR16MES544VE |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 16位微控制器 |
| 英文描述： | Family of CompactRISC 16-Bit Microcontrollers |
| 中文描述： | 家庭CompactRISC 16位微控制器 |
| 文件頁數(shù)： | 63/99頁 |
| 文件大?。?/td> | 449K |
| 代理商： | CR16MES544VE |
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flag is automatically reset when software reads the character
from the UnRBUF register. The RSFT register is not user ac-
cessible.
16.2.2
The synchronous mode of the USART enables the device to
communicate with other devices using three communication
signals: transmit, receive, and clock. In this mode, data bits
are transferred synchronously with the USART clock signal.
Data bits are transmitted on the rising edges and received on
the falling edges of the clock signal, as shown in Figure28.
Data bytes are transmitted and received least significant bit
(LSB) first.
Synchronous Mode
In the synchronous mode, the transmit shift register (TSFT)
and the transmit buffer (UnTBUF) double-buffer the data for
transmission. To transmit a character, a data byte is loaded
in the UnTBUF register. The data is then transferred to the
TSFT register. The TSFT register shifts out one bit of the cur-
rent character, LSB first, on each rising edge of the clock.
While the TSFT is shifting out the current character on the
TDXn pin, the UnTBUF register may be loaded by the soft-
ware with the next byte to be transmitted. When the TSFT fin-
ishes transmission of the last stop bit within the current
frame, the contents of UnTBUF are transferred to the TSFT
Figure 26.
USART Block Diagram
I
Sys_clk
Baud clock
Baud Clock
TDXn
RDXn
Transmitter
Receiver
Baud Rate Generator
Control and
Error Detection
Parity
Generator/Checker
CKXn
Figure 27.
USART Asynchronous Communication
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
16
Sample
Sample
STARTBIT
DATA (LSB)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
16
Sample
DATABIT
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CR16MES544VI | Family of CompactRISC 16-Bit Microcontrollers |
| CR16MES9 | Family of CompactRISC 16-Bit Microcontrollers |
| CR16MES944V8 | Family of CompactRISC 16-Bit Microcontrollers |
| CR16MES944VE | Family of CompactRISC 16-Bit Microcontrollers |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CR16MES544VI | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Family of CompactRISC 16-Bit Microcontrollers |
| CR16MES9 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Family of CompactRISC 16-Bit Microcontrollers |
| CR16MES944V8 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Family of CompactRISC 16-Bit Microcontrollers |
| CR16MES944VE | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Family of CompactRISC 16-Bit Microcontrollers |
| CR16MES944VI | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Family of CompactRISC 16-Bit Microcontrollers |
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