參數(shù)資料
型號: COP8CCR9HLQ7
廠商: National Semiconductor
文件頁數(shù): 74/111頁
文件大小: 0K
描述: IC MCU FLASH 8BIT 32K A/D 44LLP
標準包裝: 2,500
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: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 37
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 ~ 125°C
封裝/外殼: 44-WFQFN 裸露焊盤
包裝: 帶卷 (TR)
其它名稱: COP8CCR9HLQ7TR
SNOS535I – OCTOBER 2000 – REVISED MARCH 2013
5.13.7 BAUD CLOCK GENERATION
The clock inputs to the transmitter and receiver sections of the USART can be individually selected to
come either from an external source at the CKX pin (port L, pin L1) or from a source selected in the PSR
and BAUD registers. Internally, the basic baud clock is created from the MCLK through a two-stage divider
chain consisting of a 1-16 (increments of 0.5) prescaler and an 11-bit binary counter (Figure 5-18). The
divide factors are specified through two read/write registers shown in Figure 5-19. Note that the 11-bit
Baud Rate Divisor spills over into the Prescaler Select Register (PSR). PSR is cleared upon reset.
As shown in Table 5-17, a Prescaler Factor of 0 corresponds to NO CLOCK. This condition is the USART
power down mode where the USART clock is turned off for power saving purpose. The user must also
turn the USART clock off when a different baud rate is chosen.
The correspondences between the 5-bit Prescaler Select and Prescaler factors are shown in Table 5-17.
There are many ways to calculate the two divisor factors, but one particularly effective method would be to
achieve a 1.8432 MHz frequency coming out of the first stage. The 1.8432 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 5-
16). Other baud rates may be created by using appropriate divisors. The 16x clock is then divided by 16 to
provide the rate for the serial shift registers of the transmitter and receiver.
Table 5-16. Baud Rate Divisors
(1.8432 MHz Prescaler Output)(1)
Baud Rate
Divisor
1 (N-1)
110 (110.03)
1046
134.5 (134.58)
855
150
767
300
383
600
191
1200
95
1800
63
2400
47
3600
31
4800
23
7200
15
9600
11
19200
5
38400
2
(1)
The entries in Table 5-16 assume a prescaler output of 1.8432 MHz.
In asynchronous mode the baud rate could be as high as 1250k.
Figure 5-18. USART BAUD Clock Generation
Copyright 2000–2013, Texas Instruments Incorporated
Functional Description
65
Product Folder Links: COP8CBR9 COP8CCR9 COP8CDR9
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COP8CCR9HLQ8 功能描述:IC MCU FLASH 8BIT 32K A/D 44LLP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:COP8™ 8C 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(shè)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(zhuǎn)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
COP8CCR9HVA7 制造商:NSC 制造商全稱:National Semiconductor 功能描述:8-Bit CMOS Flash Microcontroller with 32k Memory, Virtual EEPROM, 10-Bit A/D and Brownout
COP8CCR9HVA8 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
COP8CCR9HVA8/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
COP8CCR9IMT7 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