參數(shù)資料
型號: MC68HC05C0B
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 4 MHz, MICROCONTROLLER, PDIP42
封裝: SDIP-42
文件頁數(shù): 88/96頁
文件大?。?/td> 357K
代理商: MC68HC05C0B
MOTOROLA
Section 12: Serial Communications Interface
Page 80
MC68HC05C0 Specification Rev. 1.2
NOTE:
The divided frequencies shown in Table 12-3 represent the highest baud
rates that can be obtained by a specific crystal frequency and using only
prescaler division. Lower baud rates may be obtained by providing a
further division using the SCI rate select bits as shown below for some
representative prescaler outputs.
Table 12-4: Transmit Baud Rate Output for a Given Prescaler Output
NOTE:
Table 12-4 illustrates how the SCI select bits can be used to provide lower
transmitter or receiver baud rates by further dividing the prescaler output
frequency. The four examples are only representative samples. In all
cases, the baud rates shown correspond to the transmit clock, and the
receive clock is 16 times higher in frequency than the actual baud rate.
SCR2:0/SCT2:0 Bits
Divided
By
Representative Highest Prescaler Baud Rate
Output
2
1
0
250.0 kHz
76.80 kHz
19.20 kHz
9600 Hz
0
1
250.0 kHz
76.80 kHz
19.20 kHz
9600 Hz
0
1
2
125.0 kHz
38.40 kHz
9600 Hz
4800 Hz
0
1
0
4
62.50 kHz
19.20 kHz
4800 Hz
2400 Hz
0
1
8
31.25 kHz
9600 Hz
2400 Hz
1200 Hz
1
0
16
15.62 kHz
4800 Hz
1200 Hz
600 Hz
1
0
1
32
7.81 kHz
2400 Hz
600 Hz
300 Hz
1
0
64
3.90 kHz
1200 Hz
300 Hz
150 Hz
1
128
1.95 kHz
600 Hz
150 Hz
75 Hz
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