参数资料
型号: ATMEGA16A-MU
厂商: Atmel
文件页数: 24/88页
文件大小: 0K
描述: MCU AVR 16K FLASH 16MHZ 44-QFN
产品培训模块: MCU Product Line Introduction
megaAVR Introduction
标准包装: 360
系列: AVR® ATmega
核心处理器: AVR
芯体尺寸: 8-位
速度: 16MHz
连通性: I²C,SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 16KB(8K x 16)
程序存储器类型: 闪存
EEPROM 大小: 512 x 8
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 2.7 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: 44-VFQFN 裸露焊盘
包装: 托盘
配用: ATSTK600-ND - DEV KIT FOR AVR/AVR32
ATSTK500-ND - PROGRAMMER AVR STARTER KIT
PIC16F610/616/16HV610/616
DS41288F-page 122
2009 Microchip Technology Inc.
12.6
Watchdog Timer (WDT)
The Watchdog Timer is a free running, on-chip RC
oscillator, which requires no external components. This
RC oscillator is separate from the external RC oscillator
of the CLKIN pin and INTOSC. That means that the
WDT will run, even if the clock on the OSC1 and OSC2
pins of the device has been stopped (for example, by
execution of a SLEEP instruction). During normal oper-
ation, a WDT Time-out generates a device Reset. If the
device is in Sleep mode, a WDT Time-out causes the
device to wake-up and continue with normal operation.
The WDT can be permanently disabled by program-
ming
the
Configuration
bit,
WDTE,
as
clear
12.6.1
WDT PERIOD
The WDT has a nominal time-out period of 18 ms (with
no
prescaler).
The
time-out
periods
vary
with
temperature, VDD and process variations from part to
part (see Table 15-4, Parameter 31). If longer time-out
periods are desired, a prescaler with a division ratio of
up to 1:128 can be assigned to the WDT under
software control by writing to the OPTION register.
Thus, time-out periods up to 2.3 seconds can be
realized.
The CLRWDT and SLEEP instructions clear the WDT
and the prescaler, if assigned to the WDT, and prevent
it from timing out and generating a device Reset.
The TO bit in the STATUS register will be cleared upon
a Watchdog Timer Time-out.
12.6.2
WDT PROGRAMMING
CONSIDERATIONS
It should also be taken in account that under worst-
case conditions (i.e., VDD = Min., Temperature = Max.,
Max. WDT prescaler) it may take several seconds
before a WDT Time-out occurs.
FIGURE 12-2:
WATCHDOG TIMER BLOCK DIAGRAM
TABLE 12-7:
WDT STATUS
Conditions
WDT
WDTE = 0
Cleared
CLRWDT
Command
Exit Sleep + System Clock = EXTRC, INTRC, EC
Exit Sleep + System Clock = XT, HS, LP
Cleared until the end of OST
T0CKI
T0SE
pin
CLKOUT
TMR0
Watchdog
Timer
WDT
Time-Out
PS<2:0>
WDTE
Data Bus
Set Flag bit T0IF
on Overflow
T0CS
Note
1: T0SE, T0CS, PSA, PS<2:0> are bits in the OPTION register.
0
1
0
1
0
1
SYNC 2
Cycles
8
8-bit
Prescaler
0
1
(= FOSC/4)
PSA
3
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