COP8AME9_14 Datasheet, PDF (56/102 Pages) Texas Instruments – COP8AME9 8-Bit CMOS Flash Microcontroller with 8k Memory, Dual Op Amps, Virtual EEPROM, Temperature Sensor, 10-Bit A/D and Brownout Reset

COP8AME9, COP8ANE9
SNOS930F – MARCH 2001 – REVISED MARCH 2013
www.ti.com
Prescaler
Select
00000
00001
00010
00011
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
Table 22. Prescaler Factors
Prescaler
Factor
NO CLOCK
1
1.5
2
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
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
(2)
The 5 entry is available in Table 22. The 1.8432 MHz prescaler output is then used with proper Baud Rate
Divisor (Table 21) to obtain different baud rates. For a baud rate of 19200 e.g., the entry in Table 21 is 5.
N − 1 = 5 (N − 1 is the value from Table 21)
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 = (F_C x 2)/(16 x N x P)
56
Submit Documentation Feedback
Copyright © 2001–2013, Texas Instruments Incorporated
Product Folder Links: COP8AME9 COP8ANE9