参数资料
型号: AT89C51ID2-SLSUM
厂商: Atmel
文件页数: 85/157页
文件大小: 0K
描述: IC 8051 MCU FLASH 64K 44PLCC
产品培训模块: MCU Product Line Introduction
标准包装: 972
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 60MHz
连通性: I²C,SPI,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 34
程序存储器容量: 64KB(64K x 8)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 2K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LCC(J 形引线)
包装: 管件
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
33
AT89C51ID2
4289C–8051–11/05
Power Monitor
The POR/PFD function monitors the internal power-supply of the CPU core memories
and the peripherals, and if needed, suspends their activity when the internal power sup-
ply falls below a safety threshold. This is achieved by applying an internal reset to them.
By generating the Reset the Power Monitor insures a correct start up when
AT89C51ID2 is powered up.
Description
In order to startup and maintain the microcontroller in correct operating mode, V
CC has
to be stabilized in the V
CC operating range and the oscillator has to be stabilized with a
nominal amplitude compatible with logic level VIH/VIL.
These parameters are controlled during the three phases: power-up, normal operation
and power going down. See Figure 10.
Figure 10. Power Monitor Block Diagram
Note:
1. Once XTAL1 High and low levels reach above and below VIH/VIL. a 1024 clock
period delay will extend the reset coming from the Power Fail Detect. If the power
falls below the Power Fail Detect threshold level, the Reset will be applied
immediately.
The Voltage regulator generates a regulated internal supply for the CPU core the mem-
ories and the peripherals. Spikes on the external Vcc are smoothed by the voltage
regulator.
VCC
Power On Reset
Power Fail Detect
Voltage Regulator
XTAL1
(1)
CPU core
Memories
Peripherals
Regulated
Supply
RST pin
Hardware
Watchdog
PCA
Watchdog
Internal Reset
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