參數(shù)資料
型號: T89C51AC2-RLTIM
廠商: Atmel
文件頁數(shù): 91/121頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 32K 44VQFP
標(biāo)準(zhǔn)包裝: 160
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 40MHz
連通性: UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 34
程序存儲器容量: 32KB(32K x 8)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 2K x 8
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-LQFP
包裝: 托盤
71
A/T89C51AC2
4127H–8051–02/08
Watchdog Timer
A/T89C51AC2 contains a powerful programmable hardware Watchdog Timer (WDT)
that automatically resets the chip if it software fails to reset the WDT before the selected
time interval has elapsed. It permits large Time-Out ranking from 16ms to 2s @Fosc =
12MHz in X1 mode.
This WDT consists of a 14-bit counter plus a 7-bit programmable counter, a Watchdog
Timer reset register (WDTRST) and a Watchdog Timer programming (WDTPRG) regis-
ter. When exiting reset, the WDT is -by default- disable.
To enable the WDT, the user has to write the sequence 1EH and E1H into WDTRST
register no instruction in between. When the Watchdog Timer is enabled, it will incre-
ment every machine cycle while the oscillator is running and there is no way to disable
the WDT except through reset (either hardware reset or WDT overflow reset). When
WDT overflows, it will generate an output RESET pulse at the RST pin. The RESET
pulse duration is 96xTOSC, where TOSC=1/FOSC. To make the best use of the WDT, it
should be serviced in those sections of code that will periodically be executed within the
time required to prevent a WDT reset
Note:
When the Watchdog is enable it is impossible to change its period.
Figure 38. Watchdog Timer
WDTPRG
RESET
Decoder
Control
WDTRST
WR
Enable
14-bit COUNTER
7-bit COUNTER
Outputs
RESET
-
2
1
0
Fwd Clock
相關(guān)PDF資料
PDF描述
DSPIC33FJ16GS402-I/MM IC DSPIC MCU/DSP 16K 28-QFN
T89C5115-TISIM IC 8051 MCU FLASH 16K 28SOIC
PIC18F27J13-I/SP IC PIC MCU 128KB FLASH 28SPDIP
T89C5115-TDSIM IC 8051 MCU FLASH 16K 24SOIC
52893-2090 CONN FFC 20POS .50MM R/A ZIF SMD
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
T89C51AC2-RLTI-M 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit MCU with 32K bytes Flash, 10 bits A/D and EEPROM
T89C51AC2-SLSC-M 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit MCU with 32K bytes Flash, 10 bits A/D and EEPROM
T89C51AC2-SLSE-M 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit MCU with 32K bytes Flash, 10 bits A/D and EEPROM
T89C51AC2-SLSIM 功能描述:IC 8051 MCU FLASH 32K 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
T89C51AC2-SLSI-M 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit MCU with 32K bytes Flash, 10 bits A/D and EEPROM