參數(shù)資料
型號: COP8CDR9IMT8
廠商: National Semiconductor
文件頁數(shù): 75/111頁
文件大?。?/td> 0K
描述: IC MCU CMOS 8BIT 48-TSSOP
標(biāo)準(zhǔn)包裝: 38
系列: COP8™ 8C
核心處理器: COP8
芯體尺寸: 8-位
速度: 20MHz
連通性: Microwire/Plus(SPI),UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 39
程序存儲器容量: 32KB(32K x 8)
程序存儲器類型: 閃存
RAM 容量: 1K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 16x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 48-TFSOP(0.240",6.10mm 寬)
包裝: 管件
其它名稱: *COP8CDR9IMT8
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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