參數(shù)資料
型號： AT89C51RD2-SLRUM
廠商： Atmel
文件頁數(shù)： 122/137頁
文件大小： 0K
描述： IC MCU FLASH 8051 EEP 64K 44PLCC
產(chǎn)品培訓(xùn)模塊： MCU Product Line Introduction
標(biāo)準(zhǔn)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(shè)備： POR，PWM，WDT
輸入/輸出數(shù)： 34
程序存儲器容量： 64KB（64K x 8）
程序存儲器類型： 閃存
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： 44-LCC（J 形引線）
包裝： 標(biāo)準(zhǔn)包裝
配用： AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
AT89STK-11-ND - KIT STARTER FOR AT89C51RX2
其它名稱： AT89C51RD2-SLRUMDKR
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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參數(shù)描述
AT89C51RD2-SLSIM 功能描述:IC 8051 MCU FLASH 64K 44PLCC RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:89C 標(biāo)準(zhǔn)包裝:9 系列:87C 核心處理器:8051 芯體尺寸:8-位 速度:40/20MHz 連通性:UART/USART 外圍設(shè)備:POR，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:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:0°C ~ 70°C 封裝/外殼:40-DIP（0.600"，15.24mm） 包裝:管件
AT89C51RD2-SLSUM 功能描述:8位微控制器 -MCU 64kB Flash 2048B RAM 2.7V-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
AT89C51RD2-SLSUM 制造商:Atmel Corporation 功能描述:IC 8BIT MCU C51/C251 60MHZ 44-PLCC
AT89C51RD2-SMSIM 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Flash Microcontroller
AT89C51RD2-SMSUM 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Flash Microcontroller
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