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| 型号： | COP8SGR840V7 |
| 厂商： | National Semiconductor Corporation |
| 英文描述： | 8-Bit CMOS ROM Based and OTP Microcontrollers with 8k to 32k Memory, Two Comparators and USART |
| 中文描述： | 8位的CMOS基于ROM和OTP微控制器具有8K到32K的内存，2个比较器和USART |
| 文件页数： | 32/62页 |
| 文件大小： | 913K |
| 代理商： | COP8SGR840V7 |
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8.0 USART
(Continued)
rates may be created by using appropriate divisors. The 16x
clock is then divided by 16 to provide the rate for the serial
shift registers of the transmitter and receiver.
TABLE 4. Baud Rate Divisors
(1.8432 MHz Prescaler Output)
Baud
Rate
Baud Rate
Divisor 1
(N-1)
1046
855
110 (110.03)
134.5
(134.58)
150
300
600
1200
1800
2400
3600
4800
7200
9600
19200
38400
767
383
191
95
63
47
31
23
15
11
5
2
Note:
The entries in Table 4assume a prescaler output of 1.8432 MHz. In the
asynchronous mode the baud rate could be as high as 987.5k.
TABLE 5. Prescaler Factors
Prescaler
Select
00000
00001
00010
00011
Prescaler
Factor
NO CLOCK
1
1.5
2
Prescaler
Select
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
01111
10000
10001
10010
10011
10100
10101
10110
10111
11000
11001
11010
11011
11100
11101
11110
11111
Prescaler
Factor
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8
8.5
9
9.5
10
10.5
11
11.5
12
12.5
13
13.5
14
14.5
15
15.5
16
10131741
FIGURE 23. USART BAUD Clock Generation
10131742
FIGURE 24. USART BAUD Clock Divisor Registers
C
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