參數(shù)資料
型號: ATMEGA16A-AUR
廠商: Atmel
文件頁數(shù): 24/88頁
文件大?。?/td> 0K
描述: MCU AVR 16KB FLASH 16MHZ 44TQFP
產品培訓模塊: megaAVR Introduction
標準包裝: 2,000
系列: AVR® ATmega
核心處理器: AVR
芯體尺寸: 8-位
速度: 16MHz
連通性: I²C,SPI,UART/USART
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 16KB(8K x 16)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 512 x 8
RAM 容量: 1K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
數(shù)據(jù)轉換器: A/D 8x10b
振蕩器型: 內部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-TQFP
包裝: 帶卷 (TR)
其它名稱: ATMEGA16A-AUR-ND
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
相關PDF資料
PDF描述
ATMEGA16L-8PJ IC MCU AVR 16K 5V 8MHZ 40-DIP
ATMEGA16U2-MUR MCU AVR 16KB FLASH 16MHZ 32VQFN
ATMEGA324PA-MCHR MCU AVR 32KB FLASH 20 MHZ 44QFN
ATMEGA3250PV-10AUR MCU AVR 32K FLASH 10MHZ 100TQFP
ATMEGA3250V-8AI IC AVR MCU 32K 8MHZ 100TQFP
相關代理商/技術參數(shù)
參數(shù)描述
ATMEGA16A-MU 功能描述:8位微控制器 -MCU 16KB In-system Flash 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
ATMEGA16A-MUR 功能描述:8位微控制器 -MCU AVR 16KB FLASH 512B EE 1KB SRAM-16MHZ 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
ATMEGA16A-PU 功能描述:8位微控制器 -MCU 16KB In-system Flash 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
ATMEGA16HVA 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Microcontroller with 8K/16K Bytes In-System Programmable Flash
ATMEGA16HVA-4CKU 功能描述:8位微控制器 -MCU 16KB Flash Memory 1.8V - 9.0V Supply 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