参数资料
型号: COP8CCR9LVA8
厂商: National Semiconductor
文件页数: 75/111页
文件大小: 0K
描述: IC MCU EEPROM 8BIT 68-PLCC
标准包装: 18
系列: COP8™ 8C
核心处理器: COP8
芯体尺寸: 8-位
速度: 20MHz
连通性: Microwire/Plus(SPI),UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 59
程序存储器容量: 32KB(32K x 8)
程序存储器类型: 闪存
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
数据转换器: A/D 16x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 68-LCC(J 形引线)
包装: 管件
其它名称: *COP8CCR9LVA8
SNOS535I – OCTOBER 2000 – REVISED MARCH 2013
Table 5-17. Prescaler Factors
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
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
Copyright 2000–2013, Texas Instruments Incorporated
Product Folder Links: COP8CBR9 COP8CCR9 COP8CDR9
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