cop8fg National Semiconductor Corporation, cop8fg Datasheet - Page 29
cop8fg
Manufacturer Part Number
cop8fg
Description
8-bit Cmos Rom Based And Otp Microcontrollers With 8k To 32k Memory, Two Comparators And Usart
Manufacturer
National Semiconductor Corporation
Datasheet
1.COP8FG.pdf
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8.0 USART
Note: The entries in Table 5 assume a prescaler output of 1.8432 MHz. In the
asynchronous mode the baud rate could be as high as 987.5k.
(1.8432 MHz Prescaler Output)
TABLE 4. Baud Rate Divisors
TABLE 5. Prescaler Factors
(110.03)
(134.58)
Prescaler
19200
38400
Baud
134.5
Rate
1200
1800
2400
3600
4800
7200
9600
Select
00000
00001
00010
00011
00100
00101
00110
00111
110
150
300
600
(Continued)
Divisor − 1
Baud Rate
NO CLOCK
Prescaler
Factor
(N-1)
1046
855
767
383
191
FIGURE 25. USART BAUD Clock Divisor Registers
95
63
47
31
23
15
11
1.5
2.5
3.5
5
2
1
2
3
4
FIGURE 24. USART BAUD Clock Generation
29
Prescaler
Select
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
10.5
11.5
12.5
13.5
14.5
15.5
4.5
5.5
6.5
7.5
8.5
9.5
10
11
12
13
14
15
16
5
6
7
8
9
DS101116-42
DS101116-41
www.national.com
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