參數(shù)資料
型號: MC68HC705PD6
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 20/165頁
文件大小: 841K
代理商: MC68HC705PD6
GENERAL RELEASE SPECIFICATION
July 7, 1997
MOTOROLA
SERIAL COMMUNICATIONS INTERFACE
MC68HC05PD6
11-14
REV 1.1
NOTE
The divided frequencies shown in Table 11-1 represent baud rates
which are the highest transmit baud rate (Tx) that can be obtained
by a specic clock frequency and only using the prescaler division.
Lower baud rate may be obtained by providing a further division
using the SCI rate select bits as shown below for some
representative prescaler outputs
Table 11-2. Transmit Baud Rate Output For a Given Prescaler Output
NOTE
Table 11-2 illustrates how the SCI select bits can be used to provide
lower transmitter baud rates by further dividing the prescaler output
frequency. The four examples are only representative samples. In all
cases, the baud rates shown are transmit baud rates (transmit clock)
and the receiver clock is 16 times higher in frequency than the
actual baud rate.
SCR2 SCR1 SCR0
DIVIDED
BY
REPRESENTATIVE HIGHEST PRESCALER BAUD RATE OUPUT
125.000 KHz
39.06 KHz
15.625 KHz
9.600KHz
0
1
125.000 KHz
39.06 KHz
15.625KHz
9600Hz
0
1
2
62.5 KHz
19.53 KHz
7.813 KHz
4800Hz
0
1
0
4
31.250 KHz
9.765 KHz
3.906 KHz
2400Hz
0
1
8
15.625 KHz
4.883 KHz
1.953 KHz
1200Hz
1
0
16
7.813 KHz
2.441 KHz
977Hz
600Hz
1
0
1
32
3.906 KHz
1.221 KHz
488 Hz
300Hz
1
0
64
1.953 KHz
610 Hz
244 Hz
150Hz
1
128
977 Hz
305 Hz
122 Hz
75Hz
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