参数资料
型号: MC68HCP11A1CFNE3
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, EEPROM, 3 MHz, MICROCONTROLLER, PQCC52
封装: PLASTIC, LCC-52
文件页数: 112/158页
文件大小: 776K
代理商: MC68HCP11A1CFNE3
MC68HC11A8
SERIAL COMMUNICATIONS INTERFACE
MOTOROLA
TECHNICAL DATA
5-13
5
NOTE
The divided frequencies shown in Table 5-3 represent baud rates
which are the highest transmit baud rate (Tx) that can be obtained by
a specific crystal frequency and only using the prescaler division.
Lower baud rates may be obtained by providing a further division us-
ing the SCI rate select bits as shown below for some representative
prescaler outputs.
NOTE
Table 5-4 illustrates how the SCI select bits can be used to provide
lower transmitter baud rates by further dividing the prescaler output
frequency. The five 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.
Table 5-4 Transmit Baud Rate Output for a Given Prescaler Output
SCR Bit
Divided
By
Representative Highest Prescaler Baud Rate Output
2
1
0
131.072 K Baud
32.768 K Baud
76.80 K Baud
19.20 K Baud
9600 Baud
4800 Baud
0
1
131.072 K Baud
32.768 K Baud
76.80 K Baud
19.20 K Baud
9600 Baud
4800 Baud
0
1
2
65.536 K Baud
16.384 K Baud
38.40 K Baud
9600 Baud
4800 Baud
2400 Baud
0
1
0
4
32.768 K Baud
8.192 K Baud
19.20 K Baud
4800 Baud
2400 Baud
1200 Baud
0
1
8
16.384 K Baud
4.096 K Baud
9600 Baud
2400 Baud
1200 Baud
600 Baud
1
0
16
8.192 K Baud
2.048 K Baud
4800 Baud
1200 Baud
600 Baud
300 Baud
1
0
1
32
4.096 K Baud
1.024 K Baud
2400 Baud
600 Baud
300 Baud
150 Baud
1
0
64
2.048 K Baud
512 Baud
1200 Baud
300 Baud
150 Baud
75 Baud
1
128
1.024 K Baud
256 Baud
600 Baud
150 Baud
75 Baud
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