參數(shù)資料
型號： AT89C51ED2-SMRUM
廠商： Atmel
文件頁數(shù)： 122/137頁
文件大小： 0K
描述： IC MCU FLASH 8051 64K 5V 68PLCC
產(chǎn)品培訓模塊： MCU Product Line Introduction
標準包裝： 1
系列： 89C
核心處理器： 8051
芯體尺寸： 8-位
速度： 60MHz
連通性： SPI，UART/USART
外圍設備： POR，PWM，WDT
輸入/輸出數(shù)： 50
程序存儲器容量： 64KB（64K x 8）
程序存儲器類型： 閃存
EEPROM 大?。?/td> 2K x 8
RAM 容量： 2K x 8
電壓 - 電源 (Vcc/Vdd)： 2.7 V ~ 5.5 V
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 68-PLCC
包裝： 標準包裝
其它名稱： AT89C51ED2-SMRUMDKR
85
4235K–8051–05/08
AT89C51RD2/ED2
Table 19-2.
WDTPRG Register
WDTPRG - Watchdog Timer Out Register (0A7h)
Reset Value = XXXX X000
19.2
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 2 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 should whenever the AT89C51RD2/ED2 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
routine.
To ensure that the WDT does not overflow within a few states of exiting of powerdown, it is bet-
ter to reset the WDT just before entering powerdown.
In the Idle mode, the oscillator continues to run. To prevent the WDT from resetting the
AT89C51RD2/ED2 while in Idle mode, the user should always set up a timer that will periodically
exit Idle, service the WDT, and re-enter Idle mode.
7
6
5
4
3
2
1
0
-
S2
S1
S0
Bit
Number
Bit
Mnemonic
Description
7
-
Reserved
The value read from this bit is undetermined. Do not try to set this bit.
6
-
5
-
4
-
3
-
2
S2
WDT Time-out select bit 2
1
S1
WDT Time-out select bit 1
0
S0
WDT Time-out select bit 0
S2
S1 S0Selected Time-out
0
00
(214 - 1) machine cycles, 16. 3 ms @ F
OSCA =12 MHz
0
01
(215 - 1) machine cycles, 32.7 ms @ FOSCA=12 MHz
0
10 (216 - 1) machine cycles, 65. 5 ms @ F
OSCA=12 MHz
0
11
(217 - 1) machine cycles, 131 ms @ F
OSCA=12 MHz
1
00
(218 - 1) machine cycles, 262 ms @ FOSCA=12 MHz
1
01 (219 - 1) machine cycles, 542 ms @ F
OSCA=12 MHz
1
10
(220 - 1) machine cycles, 1.05 ms @ F
OSCA=12 MHz
1
11
(221 - 1) machine cycles, 2.09 ms @ FOSCA=12 MHz
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相關代理商/技術參數(shù)
參數(shù)描述
AT89C51ED2-SMSIM 制造商:Atmel Corporation 功能描述:MCU 8-bit AT89 80C51 CISC 64KB Flash 3.3V/5V 68-Pin PLCC Stick 制造商:Atmel/Adesto Technologies 功能描述:Bulk 制造商:Atmel Corporation 功能描述:AT89C51ED2-SMSIM 8bit microcontroller
AT89C51ED2-SMSUM 功能描述:8位微控制器 -MCU C51ED2 64K FLASH 3-5.5V Ind 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
AT89C51ED2-UM 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Flash Microcontroller
AT89C51IC2 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Flash Microcontroller with 2-wire Interface
AT89C51IC2_04 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Flash Microcontroller with 2-wire Interface
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