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參數(shù)資料
| 型號： | ADUC841BCP62-3 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MicroConverter 12-Bit ADCs and DACs with Embedded High Speed 62-kB Flash MCU |
| 中文描述： | 8-BIT, FLASH, 8.38 MHz, MICROCONTROLLER, QCC56 |
| 封裝： | 8 X 8 MM, LEAD FRAME, MO-220VLLD2, CSP-56 |
| 文件頁數(shù)： | 53/88頁 |
| 文件大小： | 903K |
| 代理商： | ADUC841BCP62-3 |
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ADuC841/ADuC842/ADuC843
WATCHDOG TIMER
The purpose of the watchdog timer is to generate a device reset
or interrupt within a reasonable amount of time if the ADuC841/
ADuC842/ADuC843 enter an erroneous state, possibly due to a
programming error or electrical noise. The watchdog function
can be disabled by clearing the WDE (watchdog enable) bit in
the watchdog control (WDCON) SFR. When enabled, the
watchdog circuit generates a system reset or interrupt (WDS) if
the user program fails to set the watchdog (WDE) bit within a
predetermined amount of time (see PRE3-0 bits in Table 23.
The watchdog timer is clocked directly from the 32 kHz
external crystal on the ADuC842/ADuC843. On the ADuC841,
Table 23. WDCON SFR Bit Designations
Bit No.
Name
Description
7
PRE3
Watchdog Timer Prescale Bits.
6
PRE2
The watchdog timeout period is given by the equation
t
WD
= (2
PRE
× (2
9
/ f
XTAL
))
5
PRE1
(0 – PRE – 7; f
XTAL
= 32.768 kHz (ADuC842/ADuC843), or 32kHz ± 10%(ADuC841) )
PRE3
PRE2
PRE1
0
0
0
0
0
0
0
0
1
0
0
1
0
1
0
0
1
0
0
1
1
0
1
1
1
0
0
PRE3–0 > 1000
3
WDIR
Watchdog Interrupt Response Enable Bit.
If this bit is set by the user, the watchdog generates an interrupt response instead of a system reset when the
watchdog timeout period has expired. This interrupt is not disabled by the CLR EA instruction, and it is also a fixed,
high priority interrupt. If the watchdog is not being used to monitor the system, it can be used alternatively as a
timer. The prescaler is used to set the timeout period in which an interrupt will be generated.
2
WDS
Watchdog Status Bit.
Set by the watchdog controller to indicate that a watchdog timeout has occurred.
Cleared by writing a 0 or by an external hardware reset. It is not cleared by a watchdog reset.
1
WDE
Watchdog Enable Bit.
Set by the user to enable the watchdog and clear its counters. If this bit is not set by the user within the watchdog
timeout period, the watchdog generates a reset or interrupt, depending on WDIR.
Cleared under the following conditions: user writes 0, watchdog reset (WDIR = 0); hardware reset; PSM interrupt.
Watchdog Write Enable Bit.
To write data to the WDCON SFR involves a double instruction sequence. The WDWR bit must be set and the very
next instruction must be a write instruction to the WDCON SFR.
For example:
CLR
EA
;disable interrupts while writing
;to WDT
SETB
WDWR
;allow write to WDCON
MOV
WDCON,#72H
;enable WDT for 2.0s timeout
SETB
EA
;enable interrupts again (if rqd)
Rev. 0 | Page 53 of 88
the watchdog timer is clocked by an internal R/C oscillator at
32 kHz ±10%. The WDCON SFR can be written only by user
software if the double write sequence described in WDWR
below is initiated on every write access to the WDCON SFR.
WDCON Watchdog Timer
SFR Address
Power-On Default
Bit Addressable
Control Register
C0H
10H
Yes
PRE0
0
1
0
1
0
1
0
1
0
Timeout Period (ms)
15.6
31.2
62.5
125
250
500
1000
2000
0.0
Action
Reset or Interrupt
Reset or Interrupt
Reset or Interrupt
Reset or Interrupt
Reset or Interrupt
Reset or Interrupt
Reset or Interrupt
Reset or Interrupt
Immediate Reset
Reserved
4
PRE0
0
WDWR
相關(guān)PDF資料 |
PDF描述 |
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| ADUC841BCP62-5 | Cable Gland (Clamp); Connector Shell Size:10SL, 12S; Thread Size:5/8-24; Approval Categories:MIL-C-5015; Series:97 RoHS Compliant: Yes |
| ADUC841BCP8-3 | 10-823955-004 |
| ADUC841BCP8-5 | Cable Gland (Clamp); Connector Shell Size:14, 14S; Thread Size:3/4-20; Body Material:Zinc Alloy |
| ADUC841BS62-3 | MicroConverter 12-Bit ADCs and DACs with Embedded High Speed 62-kB Flash MCU |
| ADUC841BS62-5 | MicroConverter 12-Bit ADCs and DACs with Embedded High Speed 62-kB Flash MCU |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADUC841BCP62-5 | 制造商:Analog Devices 功能描述:MCU 8-Bit ADuC8xx 8052 CISC 62KB Flash 5V 56-Pin LFCSP EP |
| ADUC841BCP8-3 | 制造商:Analog Devices 功能描述:MCU 8-bit ADuC8xx 8052 CISC 62KB Flash 3V 56-Pin LFCSP EP 制造商:Rochester Electronics LLC 功能描述:8BIT CISC 62KB FLASH 20MHZ 3.3V 56LFCSP - Bulk |
| ADUC841BCP8-5 | 制造商:AD 制造商全稱:Analog Devices 功能描述:MicroConverter 12-Bit ADCs and DACs with Embedded High Speed 62-kB Flash MCU |
| ADUC841BCPZ62-3 | 功能描述:IC MCU 62K FLASH ADC/DAC 56LFCSP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 標(biāo)準(zhǔn)包裝:38 系列:Encore!® XP® 核心處理器:eZ8 芯體尺寸:8-位 速度:5MHz 連通性:IrDA，UART/USART 外圍設(shè)備:欠壓檢測/復(fù)位，LED，POR，PWM，WDT 輸入/輸出數(shù):16 程序存儲器容量:4KB（4K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:1K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 105°C 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 包裝:管件 其它名稱:269-4116Z8F0413SH005EG-ND |
| ADUC841BCPZ62-5 | 功能描述:IC MCU 62K FLASH ADC/DAC 56LFCSP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 標(biāo)準(zhǔn)包裝:38 系列:Encore!® XP® 核心處理器:eZ8 芯體尺寸:8-位 速度:5MHz 連通性:IrDA，UART/USART 外圍設(shè)備:欠壓檢測/復(fù)位，LED，POR，PWM，WDT 輸入/輸出數(shù):16 程序存儲器容量:4KB（4K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:1K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 105°C 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 包裝:管件 其它名稱:269-4116Z8F0413SH005EG-ND |
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