參數(shù)資料
型號(hào)： AT89C51RC-24JU
廠商： Atmel
文件頁數(shù)： 4/36頁
文件大?。?/td> 0K
描述： IC 8051 MCU FLASH 32K 44PLCC
產(chǎn)品培訓(xùn)模塊： MCU Product Line Introduction
標(biāo)準(zhǔn)包裝： 27
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(shè)備： WDT
輸入/輸出數(shù)： 32
程序存儲(chǔ)器容量： 32KB（32K x 8）
程序存儲(chǔ)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(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 44-LCC（J 形引線）
包裝： 管件
配用： AT89STK-11-ND - KIT STARTER FOR AT89C51RX2
12
1920D–MICRO–6/08
AT89C51RC
9.
Using the WDT
To enable the WDT, a user must write 01EH and 0E1H in sequence to the WDTRST register
(SFR location 0A6H). When the WDT is enabled, the user needs to service it by writing 01EH
and 0E1H to WDTRST to avoid a WDT overflow. The 13-bit counter overflows when it reaches
8191 (1FFFH), and this will reset the device. When the WDT is enabled, it will increment every
machine cycle while the oscillator is running. This means the user must re-initialize the WDT at
least every 8191 machine cycles. To re-initialize the WDT the user must write 01EH and 0E1H
to WDTRST. WDTRST is a write-only register. The WDT counter cannot be read or written.
When WDT overflows, it will generate an output RESET pulse at the RST pin. The RESET pulse
duration is 98xTOSC, where TOSC=1/FOSC. To make the best use of the WDT, it should be
serviced in those sections of code that will periodically be executed within the time required to
prevent a WDT reset.
10. WDT During Power-down and Idle
In Power-down mode the oscillator stops, which means the WDT also stops. While in Power-
down mode, the user does not need to service the WDT. There are two methods of exiting
Power-down mode: by a hardware reset or via a level-activated external interrupt which is
enabled prior to entering Power-down mode. When Power-down is exited with hardware reset,
servicing the WDT should occur as it normally does whenever the AT89C51RC is reset. Exiting
Power-down with an interrupt is significantly different. The interrupt is held low long enough for
the oscillator to stabilize. When the interrupt is brought high, the interrupt is serviced. To prevent
the WDT from resetting the device while the interrupt pin is held low, the WDT is not started until
the interrupt is pulled high. It is suggested that the WDT be reset during the interrupt service for
the interrupt used to exit Power-down mode.
To ensure that the WDT does not overflow within a few states of exiting Power-down, it is best to
reset the WDT just before entering Power-down mode.
Before going into the IDLE mode, the WDIDLE bit in SFR AUXR is used to determine whether
the WDT continues to count if enabled. The WDT keeps counting during IDLE (WDIDLE bit = 0)
as the default state. To prevent the WDT from resetting the AT89C51RC while in IDLE mode,
the user should always set up a timer that will periodically exit IDLE, service the WDT, and reen-
ter IDLE mode.
With WDIDLE bit enabled, the WDT will stop to count in IDLE mode and resumes the count
upon exit from IDLE.
11. UART
The UART in the AT89C51RC operates the same way as the UART in the AT89C51 and
AT89C52. For more detailed information on the UART operation, please click on the document
link below:
http://www.atmel.com/dyn/resources/prod_documents/DOC4316.PDF
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AT89C51RC-24JU SL383 制造商:Atmel Corporation 功能描述:
AT89C51RC-24PC 功能描述:8位微控制器 -MCU 32K FLASH 4.0 TO 5.5V - 24MHZ 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT
AT89C51RC-24PI 功能描述:8位微控制器 -MCU 32K FLASH 4.0 TO 5.5V - 24MHZ 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT
AT89C51RC-24PU 功能描述:8位微控制器 -MCU 32K FLASH 4.0 TO 5.5V 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT
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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT
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