Ω Pull-down Resistor(1)
參數(shù)資料
型號: AT89C51RB2-SLSUM
廠商: Atmel
文件頁數(shù): 108/127頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 16K 44PLCC
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準包裝: 972
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 60MHz
連通性: SPI,UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 16KB(16K x 8)
程序存儲器類型: 閃存
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-LCC(J 形引線)
包裝: 管件
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
AT89STK-11-ND - KIT STARTER FOR AT89C51RX2
81
AT89C51RB2/RC2
4180E–8051–10/06
Table 1. Minimum Reset Capacitor Value for a 50 k
Ω Pull-down Resistor(1)
Note:
These values assume VDD starts from 0V to the nominal value. If the time between 2
on/off sequences is too fast, the power-supply de-coupling capacitors may not be fully
discharged, leading to a bad reset sequence.
Warm Reset
To achieve a valid reset, the reset signal must be maintained for at least 2 machine
cycles (24 oscillator clock periods) while the oscillator is running. The number of clock
periods is mode independent (X2 or X1).
Watchdog Reset
As detailed in Section “Hardware Watchdog Timer”, page 77, the WDT generates a 96-
clock period pulse on the RST pin. In order to properly propagate this pulse to the rest of
the application in case of external capacitor or power-supply supervisor circuit, a 1 k
Ω
resistor must be added as shown Figure 33.
Figure 33. Reset Circuitry for WDT Reset-out Usage
Oscillator
Start-Up Time
VDD Rise Time
1 ms
10 ms
100 ms
5 ms
820 nF
1.2 F
12 F
20 ms
2.7 F
3.9 F
12 F
R
RS
T
RST
VSS
To CPU Core
and Peripherals
VDD
+
P
VDD
From WDT
Reset Source
VSS
VDD
RST
1K
To Other
On-board
Circuitry
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