參數(shù)資料
型號(hào)： AT89EB5114-TGSIL
廠商： Atmel
文件頁數(shù)： 86/86頁
文件大小： 0K
描述： IC 8051 MCU FLASH 4K 20SOIC
產(chǎn)品培訓(xùn)模塊： MCU Product Line Introduction
標(biāo)準(zhǔn)包裝： 38
系列： 89EB
核心處理器： 8051
芯體尺寸： 8-位
速度： 40MHz
外圍設(shè)備： POR，PWM，WDT
輸入/輸出數(shù)： 11
程序存儲(chǔ)器容量： 4KB（4K x 8）
程序存儲(chǔ)器類型： 閃存
EEPROM 大?。?/td> 256 x 8
RAM 容量： 256 x 8
電壓 - 電源 (Vcc/Vdd)： 3 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 6x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 20-SOIC（0.295"，7.50mm 寬）
包裝： 管件
產(chǎn)品目錄頁面： 616 (CN2011-ZH PDF)
9
AT89/83EB5114
4311C–8051–02/08
Power Monitor
The Power Monitor function supervises the evolution of the voltages feeding the micro-
controller, and if needed, suspends its activity when the detected value is out of
specification.
It warrants proper startup when AT8xEB5114 is powered up and prevents code execu-
tion errors when the power supply becomes lower than the functional threshold.
This chapter describes the functions of the power monitor.
Description
In order to startup and to properly maintain the microcontroller operation, Vcc has to be
stabilized in the Vcc operating range and the oscillator has to be stabilized with a nomi-
nal amplitude compatible with logic threshold.
In order to be sure the oscillator is stabilized, there is an internal counter which main-
tains the reset during 1024 clock periods in case the oscillator selected is the OSC A
and 64 clock periods in case the oscillator used is OSC B or OSC C.
This control is carried out during three phases: the power-up, normal operation and
stop. In accordance with the following requirements:
it guarantees an operational Reset when the microcontroller is powered-up, and
a protection if the power supply goes below minimum operating Vcc
Figure 2. Power Monitor Block Diagram
Power Monitor diagram
The Power Monitor monitors the power-supply in order to detect any voltage drops
which are not in the target specification. The power monitor block verifies two kinds of
situation that may occur:
during the power-up condition, when Vcc reaches the product specification,
during a steady-state condition, when Vcc is at nominal value but disturbed by any
undesired voltage drops.
Figure 2 shows some configurations which can be handled by the Power Monitor.
External
Power-Supply Vcc
Internal RESET
Power Fail
Detector
Power up
Detector
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