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| 型號： | AT89C51RC-24PU |
| 廠商： | Atmel |
| 文件頁數(shù)： | 5/36頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU 32K FLASH 24MHZ 40-DIP |
| 產(chǎn)品培訓模塊： | MCU Product Line Introduction |
| 標準包裝： | 10 |
| 系列： | 89C |
| 核心處理器： | 8051 |
| 芯體尺寸： | 8-位 |
| 速度： | 24MHz |
| 連通性： | SPI，UART/USART |
| 外圍設備： | WDT |
| 輸入/輸出數(shù)： | 32 |
| 程序存儲器容量： | 32KB（32K x 8） |
| 程序存儲器類型： | 閃存 |
| RAM 容量： | 512 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 4 V ~ 5.5 V |
| 振蕩器型： | 內部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 40-DIP（0.600"，15.24mm） |
| 包裝： | 管件 |
| 配用： | AT89STK-11-ND - KIT STARTER FOR AT89C51RX2 |
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13
1920D–MICRO–6/08
AT89C51RC
12. Timer 0 and 1
Timer 0 and Timer 1 in the AT89C51RC operate the same way as Timer 0 and Timer 1 in the
AT89C51 and AT89C52. For further information on the timers’ operation, please click on the
document link below:
http://www.atmel.com/dyn/resources/prod_documents/DOC4316.PDF
13. Timer 2
Timer 2 is a 16-bit Timer/Counter that can operate as either a timer or an event counter. The
type of operation is selected by bit C/T2 in the SFR T2CON (shown in Table 5-2). Timer 2 has
three operating modes: capture, auto-reload (up or down counting), and baud rate generator.
The modes are selected by bits in T2CON, as shown in Table 13-1.
Timer 2 consists of two 8-bit registers, TH2 and TL2. In the Timer function, the TL2 register is
incremented every machine cycle. Since a machine cycle consists of 12 oscillator periods, the
count rate is 1/12 of the oscillator frequency.
In the Counter function, the register is incremented in response to a 1-to-0 transition at its corre-
sponding external input pin, T2. In this function, the external input is sampled during S5P2 of
every machine cycle. When the samples show a high in one cycle and a low in the next cycle,
the count is incremented. The new count value appears in the register during S3P1 of the cycle
following the one in which the transition was detected. Since two machine cycles (24 oscillator
periods) are required to recognize a 1-to-0 transition, the maximum count rate is 1/24 of the
oscillator frequency. To ensure that a given level is sampled at least once before it changes, the
level should be held for at least one full machine cycle.
13.1
Capture Mode
In the capture mode, two options are selected by bit EXEN2 in T2CON. If EXEN2 = 0, Timer 2 is
a 16-bit timer or counter which upon overflow sets bit TF2 in T2CON. This bit can then be used
to generate an interrupt. If EXEN2 = 1, Timer 2 performs the same operation, but a 1-to-0 transi-
tion at external input T2EX also causes the current value in TH2 and TL2 to be captured into
RCAP2H and RCAP2L, respectively. In addition, the transition at T2EX causes bit EXF2 in
T2CON to be set. The EXF2 bit, like TF2, can generate an interrupt. The capture mode is illus-
trated in Figure 13-1.
Table 13-1.
Timer 2 Operating Modes
RCLK +TCLK
CP/RL2
TR2
MODE
0
1
16-bit Auto-reload
0
1
16-bit Capture
1
X
1
Baud Rate Generator
X
0
(Off)
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| AT89C51RC2-DDW | 功能描述:8位微控制器 -MCU Microcontroller 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 |
| AT89C51RC2-RLRIL | 功能描述:IC MCU FLASH 8051 32K 3V 44-VQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:89C 產(chǎn)品培訓模塊:MCU Product Line Introduction AVR® UC3 Introduction 標準包裝:2,500 系列:AVR®32 UC3 B 核心處理器:AVR 芯體尺寸:32-位 速度:60MHz 連通性:I²C，IrDA，SPI，SSC，UART/USART，USB 外圍設備:欠壓檢測/復位，DMA，POR，PWM，WDT 輸入/輸出數(shù):28 程序存儲器容量:128KB（128K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:32K x 8 電壓 - 電源 (Vcc/Vdd):1.65 V ~ 1.95 V 數(shù)據(jù)轉換器:A/D 6x10b 振蕩器型:內部 工作溫度:-40°C ~ 85°C 封裝/外殼:48-TQFP 包裝:帶卷 (TR) 配用:ATSTK600-TQFP48-ND - STK600 SOCKET/ADAPTER 48-TQFPATAVRONEKIT-ND - KIT AVR/AVR32 DEBUGGER/PROGRMMRATEVK1101-ND - KIT DEV/EVAL FOR AVR32 AT32UC3B 其它名稱:AT32UC3B1128-AUR-NDAT32UC3B1128-AURTR |
| AT89C51RC2-RLRIM | 功能描述:IC MCU FLASH 8051 32K 5V 44-VQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:89C 標準包裝:1,500 系列:AVR® ATtiny 核心處理器:AVR 芯體尺寸:8-位 速度:16MHz 連通性:I²C，LIN，SPI，UART/USART，USI 外圍設備:欠壓檢測/復位，POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):16 程序存儲器容量:8KB（4K x 16） 程序存儲器類型:閃存 EEPROM 大小:512 x 8 RAM 容量:512 x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉換器:A/D 11x10b 振蕩器型:內部 工作溫度:-40°C ~ 125°C 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 包裝:帶卷 (TR) |
| AT89C51RC2-RLRUL | 功能描述:8位微控制器 -MCU C51RC2 FLASH 32k 5V 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 |
| AT89C51RC2-RLRUM | 功能描述:8位微控制器 -MCU C51RC2 FLASH 32k 5V COM 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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