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COP8CCR9IMT7/NOPB 데이터시트(PDF) 66 Page - Texas Instruments

부품명 COP8CCR9IMT7/NOPB
상세설명  8-Bit CMOS Flash Microcontroller with 32k Memory
PDF  111 Pages
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COP8CCR9IMT7/NOPB 데이터시트(HTML) 66 Page - Texas Instruments

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COP8CBR9, COP8CCR9, COP8CDR9
SNOS535I – OCTOBER 2000 – REVISED MARCH 2013
www.ti.com
Table 5-17. Prescaler Factors
Prescaler
Prescaler
Select
Factor
00000
NO CLOCK
00001
1
00010
1.5
00011
2
00100
2.5
00101
3
00110
3.5
00111
4
01000
4.5
01001
5
01010
5.5
01011
6
01100
6.5
01101
7
01110
7.5
01111
8
10000
8.5
10001
9
10010
9.5
10011
10
10100
10.5
10101
11
10110
11.5
10111
12
11000
12.5
11001
13
11010
13.5
11011
14
11100
14.5
11101
15
11110
15.5
11111
16
As an example, considering Asynchronous Mode and a crystal frequency of 4.608 MHz, the prescaler
factor selected is:
(4.608 x 2)/1.8432 = 5
The 5 entry is available in Table 5-17. The 1.8432 MHz prescaler output is then used with proper Baud
Rate Divisor (Table 5-16) to obtain different baud rates. For a baud rate of 19200 e.g., the entry in
Table 5-16 is 5.
N
− 1 = 5 (N − 1 is the value from Table 5-16)
N = 6 (N is the Baud Rate Divisor)
Baud Rate = 1.8432 MHz/(16 x 6) = 19200
The divide by 16 is performed because in the asynchronous mode, the input frequency to the USART is
16 times the baud rate. The equation to calculate baud rates is given below.
The actual Baud Rate may be found from:
BR = (FC x 2)/(16 x N x P)
66
Functional Description
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Product Folder Links: COP8CBR9 COP8CCR9 COP8CDR9



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