参数资料
型号: ATTINY84A-SSU
厂商: Atmel
文件页数: 27/135页
文件大小: 0K
描述: IC MCU 8BIT 8K FLASH 14SOIC
标准包装: 55
系列: AVR® ATtiny
核心处理器: AVR
芯体尺寸: 8-位
速度: 20MHz
连通性: USI
外围设备: 欠压检测/复位,POR,PWM,温度传感器,WDT
输入/输出数: 12
程序存储器容量: 8KB(4K x 16)
程序存储器类型: 闪存
EEPROM 大小: 512 x 8
RAM 容量: 512 x 8
电压 - 电源 (Vcc/Vdd): 1.8 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 14-SOIC(0.154",3.90mm 宽)
包装: 管件
122
32015G–AVR32–09/09
AT32AP7001
13. Watchdog Timer (WDT)
Rev: 1.0.1
13.1
Features
Watchdog timer with 16-bit prescaler
13.2
Description
The Watchdog Timer (WDT) is fed from a 16-bit prescaler, which is clocked from the 32 kHz
oscillator. Any tapping of the prescaler can be selected as clock source for the WDT.The watch-
dog timer must be periodically reset by software within the timeout period, ot herwise, the device
is reset and starts executing from the boot vector. This allows the device to recover from a con-
dition that has caused the system to be unstable.
13.3
Block Diagram
Figure 13-1. Real Time Counter module block diagram
13.4
Product Dependencies
13.4.1
I/O Lines
None
13.4.2
Power Management
The WDT is continously clocked, and remains operating in all sleep modes. However, if the
WDT is enabled and the user tries to enter a sleepmode where the 32 KHz oscillator is turned off
the system will enter the STOP sleepmode instead. This is to ensure the WDT is still running.
13.4.3
Debug Operation
The watchdog timer is frozen during debug operation, unless the OCD system keeps peripherals
running in debug operation.
16-bit P res c a le r
32 K H z
WD T _ C L R
W a tc hdog
De te c to r
W D T _ CT RL
W a tc hdog
re s e t
相关PDF资料
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