參數(shù)資料
型號(hào)： AT89S52-24PC
廠商： Atmel
文件頁(yè)數(shù)： 3/37頁(yè)
文件大?。?/td> 0K
描述： IC MCU 8K FLASH 24MHZ 40-DIP
標(biāo)準(zhǔn)包裝： 9
系列： 89S
核心處理器： 8051
芯體尺寸： 8-位
速度： 24MHz
連通性： UART/USART
外圍設(shè)備： WDT
輸入/輸出數(shù)： 32
程序存儲(chǔ)器容量： 8KB（8K x 8）
程序存儲(chǔ)器類型： 閃存
RAM 容量： 256 x 8
電壓 - 電源 (Vcc/Vdd)： 4 V ~ 5.5 V
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
11
1919D–MICRO–6/08
AT89S52
WDT overflows, it will generate an output RESET pulse at the RST pin. The RESET pulse dura-
tion is 98xTOSC, 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.
7.2
WDT During Power-down and Idle
In Power-down mode the oscillator stops, which means the WDT also stops. While in Power-
down mode, the user does not need to service the WDT. There are two methods of exiting
Power-down mode: by a hardware reset or via a level-activated external interrupt which is
enabled prior to entering Power-down mode. When Power-down is exited with hardware reset,
servicing the WDT should occur as it normally does whenever the AT89S52 is reset. Exiting
Power-down with an interrupt is significantly different. The interrupt is held low long enough for
the oscillator to stabilize. When the interrupt is brought high, the interrupt is serviced. To prevent
the WDT from resetting the device while the interrupt pin is held low, the WDT is not started until
the interrupt is pulled high. It is suggested that the WDT be reset during the interrupt service for
the interrupt used to exit Power-down mode.
To ensure that the WDT does not overflow within a few states of exiting Power-down, it is best to
reset the WDT just before entering Power-down mode.
Before going into the IDLE mode, the WDIDLE bit in SFR AUXR is used to determine whether
the WDT continues to count if enabled. The WDT keeps counting during IDLE (WDIDLE bit = 0)
as the default state. To prevent the WDT from resetting the AT89S52 while in IDLE mode, the
user should always set up a timer that will periodically exit IDLE, service the WDT, and reenter
IDLE mode.
With WDIDLE bit enabled, the WDT will stop to count in IDLE mode and resumes the count
upon exit from IDLE.
8.
UART
The UART in the AT89S52 operates the same way as the UART in the AT89C51 and AT89C52.
For further information on the UART operation, please click on the document link below:
http://www.atmel.com/dyn/resources/prod_documents/DOC4316.PDF
9.
Timer 0 and 1
Timer 0 and Timer 1 in the AT89S52 operate the same way as Timer 0 and Timer 1 in the
AT89C51 and AT89C52. For further information on the timers’ operation, please click on the
document link below:
http://www.atmel.com/dyn/resources/prod_documents/DOC4316.PDF
相關(guān)PDF資料
PDF描述
AT89S52-24JI IC MCU 8K FLASH 24MHZ 44-PLCC
AT89S52-24JC IC MCU 8K FLASH 24MHZ 44-PLCC
AT89S52-24AI IC MCU 8K FLASH 24MHZ 44-TQFP
10FMN-SMT-A-TF CONN FMN HOUSING 10POS SIDE SMD
09FMN-SMT-A-TF CONN FMN HOUSING 9POS SIDE SMD
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AT89S52-24PI 功能描述:8位微控制器 -MCU 8K ISP FLASH 2.7 TO 5.5V - 24MHz 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT
AT89S52-24PJ 功能描述:8位微控制器 -MCU Microcontroller 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT
AT89S52-24PU 功能描述:8位微控制器 -MCU 8kB Flash 256B RAM 33MHz 4.0V-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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT
AT89S52-24PU SL383 制造商:Atmel Corporation 功能描述:8051 8K ISP FLASH 4.0 TO 5.5V
AT89S52-25JI 制造商:Atmel Corporation 功能描述:
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