參數(shù)資料
型號: MC68HC11A8BMP2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: HCMOS Single-Chip Microcontroller
中文描述: 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDIP48
封裝: DIP-48
文件頁數(shù): 57/158頁
文件大?。?/td> 776K
代理商: MC68HC11A8BMP2
MC68HC11A8
TECHNICAL DATA
SERIAL COMMUNICATIONS INTERFACE
MOTOROLA
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
2
1
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
Divided
By
1
2
4
8
16
32
64
128
Representative Highest Prescaler Baud Rate Output
32.768 K Baud
76.80 K Baud
32.768 K Baud
76.80 K Baud
16.384 K Baud
38.40 K Baud
8.192 K Baud
19.20 K Baud
4.096 K Baud
9600 Baud
2.048 K Baud
4800 Baud
1.024 K Baud
2400 Baud
512 Baud
1200 Baud
256 Baud
600 Baud
0
0
1
0
1
0
1
0
1
131.072 K Baud
131.072 K Baud
65.536 K Baud
32.768 K Baud
16.384 K Baud
8.192 K Baud
4.096 K Baud
2.048 K Baud
1.024 K Baud
19.20 K Baud
19.20 K Baud
9600 Baud
4800 Baud
2400 Baud
1200 Baud
600 Baud
300 Baud
150 Baud
9600 Baud
9600 Baud
4800 Baud
2400 Baud
1200 Baud
600 Baud
300 Baud
150 Baud
75 Baud
4800 Baud
4800 Baud
2400 Baud
1200 Baud
600 Baud
300 Baud
150 Baud
75 Baud
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