參數(shù)資料
型號： MC68HSC05C9ACP
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 4.1 MHz, MICROCONTROLLER, PDIP40
封裝： PLASTIC, DIP-40
文件頁數(shù)： 142/162頁
文件大?。?/td> 1093K
代理商： MC68HSC05C9ACP
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Serial Communications Interface (SCI)
Advance Information
MC68HC05C9A — Rev. 5.0
80
Serial Communications Interface (SCI)
MOTOROLA
9.9 Receive Data In (RDI)
Receive data is the serial data that is applied through the input line and
the SCI to the internal bus. The receiver circuitry clocks the input at a
rate equal to 16 times the baud rate. This time is referred to as the RT
rate in Figure 9-4 and as the receiver clock in Figure 9-6.
Figure 9-4. SCI Examples of Start Bit Sampling Techniques
The receiver clock generator is controlled by the baud rate register;
however, the SCI is synchronized by the start bit, independent of the
transmitter.
Once a valid start bit is detected, the start bit, each data bit, and the stop
bit are sampled three times at RT intervals 8RT, 9RT, and 10RT
(1RT is the position where the bit is expected to start), as shown in
Figure 9-5. The value of the bit is determined by voting logic which takes
the value of the majority of the samples. A noise flag is set when all three
samples on a valid start bit or data bit or the stop bit do not agree.
Figure 9-5. SCI Sampling Technique Used on All Bits
1
0000
1
0010
11
10
11
0
NOISE
START
RDI
IDLE
1RT
2RT 3RT
4RT
5RT
6RT 7RT
RTCLOCKEDGESFORALLTHREEEXAMPLES
16XINTERNALSAMPLINGCLOCK
9RT
8RT
10RT
16RT 1RT
SAMPLES
NEXT BIT
PREVIOUS BIT
RDI
相關(guān)PDF資料
PDF描述
MC68HC05C9AMP 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP40
MC68HC05C9AMFN 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC44
MC68HC05C9AFB 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP44
MC68HC05C9AMB 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP42
MC68HSC05C9AFN 8-BIT, MROM, 4.1 MHz, MICROCONTROLLER, PQCC44
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