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參數(shù)資料
| 型號： | COP8SBR9 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 8-Bit CMOS Flash Based Microcontroller with 32k Memory, Virtual EEPROM and Brownout(8位基于CMOS 閃速存儲器的帶32K存儲器，虛擬EEPROM和電壓過低復位的微控制器) |
| 中文描述： | 8位CMOS閃存為基礎的32K的內(nèi)存，虛擬EEPROM和欠壓（8位基于的CMOS閃速存儲器的帶32K的存儲器，微控制器虛擬的EEPROM和電壓過低復位的微控制器） |
| 文件頁數(shù)： | 40/68頁 |
| 文件大?。?/td> | 714K |
| 代理商： | COP8SBR9 |
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8.0 USART
(Continued)
MHz prescaler output is then used to drive the software
programmable baud rate counter to create a 16x clock for
the following baud rates: 110, 134.5, 150, 300, 600, 1200,
1800, 2400, 3600, 4800, 7200, 9600, 19200 and 38400
(Table 18). Other baud rates may be created by using ap-
propriate divisors. The 16x clock is then divided by 16 to
provide the rate for the serial shift registers of the transmitter
and receiver.
TABLE 18. Baud Rate Divisors
(1.8432 MHz Prescaler Output)
Baud Rate
Baud Rate
Divisor 1 (N-1)
1046
855
767
383
191
95
63
47
31
23
15
11
5
2
110 (110.03)
134.5 (134.58)
150
300
600
1200
1800
2400
3600
4800
7200
9600
19200
38400
Note:
The entries in Table 20 assume a prescaler output of 1.8432 MHz. In
asynchronous mode the baud rate could be as high as 625k.
TABLE 19. Prescaler Factors
Prescaler
Select
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
Prescaler
Factor
NO CLOCK
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
Prescaler
Select
01100
01101
01110
01111
10000
10001
10010
10011
10100
10101
10110
10111
11000
11001
11010
11011
11100
11101
11110
11111
Prescaler
Factor
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, consideringAsynchronous Mode and a crys-
tal frequency of 4.608 MHz, the prescaler factor selected is:
(4.608 x 2)/1.8432 = 5
The 5 entry is available in Table 19 The 1.8432 MHz pres-
caler output is then used with proper Baud Rate Divisor
(Table 18) to obtain different baud rates. For a baud rate of
19200 e.g., the entry in Table 19 is 5.
N 1 = 5 (N 1 is the value from Table 28)
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)
Where:
BR is the Baud Rate
F
C
is the crystal frequency
N is the Baud Rate Divisor (Table 18)
P is the Prescaler Divide Factor selected by the value in the
Prescaler Select Register (Table 19)
Note:
In the Synchronous Mode, the divisor 16 is replaced
by two.
Example:
Asynchronous Mode:
Crystal Frequency = 5 MHz
Desired baud rate = 19200
Using the above equation N x P can be calculated first.
N x P = (5 x 10
6
x 2)/(16 x 19200) = 32.552
Now 32.552 is divided by each Prescaler Factor (Table 19) to
obtain a value closest to an integer. This factor happens to
be 6.5 (P = 6.5).
DS101389-27
FIGURE 23. USART BAUD Clock Generation
C
www.national.com
40
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| COP8SBR9HLQ8 | 功能描述:IC ADC FLASH 8BIT 44-LLP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:COP8™ 8S 標準包裝:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN，SCI，SPI 外圍設備:POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):21 程序存儲器容量:40KB（20K x 16） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數(shù)據(jù)轉換器:A/D 6x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
| COP8SBR9HVA8 | 功能描述:8位微控制器 -MCU RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
| COP8SBR9HVA8/NOPB | 功能描述:8位微控制器 -MCU RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
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