AT89C51RD2-SLSIM Atmel, AT89C51RD2-SLSIM Datasheet - Page 26

IC 8051 MCU FLASH 64K 44PLCC

AT89C51RD2-SLSIM

Manufacturer Part Number
AT89C51RD2-SLSIM
Description
IC 8051 MCU FLASH 64K 44PLCC
Manufacturer
Atmel
Series
89Cr
Datasheet

Specifications of AT89C51RD2-SLSIM

Core Processor
8051
Core Size
8-Bit
Speed
60MHz
Connectivity
SPI, UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
34
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-PLCC
For Use With
AT89STK-11 - KIT STARTER FOR AT89C51RX2
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AT89C51RD2-SLSIM
Manufacturer:
ATMEL
Quantity:
12 606
Part Number:
AT89C51RD2-SLSIM
Manufacturer:
Atmel
Quantity:
10 000
10. Reset
10.1
10.2
10.3
26
Introduction
Reset Input
Reset Output
AT89C51RD2/ED2
The reset sources are: Power Management, Hardware Watchdog, PCA Watchdog and Reset
input.
Figure 10-1. Reset schematic
The Reset input can be used to force a reset pulse longer than the internal reset controlled by
the Power Monitor. RST input has a pull-down resistor allowing power-on reset by simply con-
necting an external capacitor to V
characteristics are discussed in the Section “DC Characteristics” of the AT89C51RD2/ED2
datasheet.
Figure 10-2. Reset Circuitry and Power-On Reset
Reset output can be generated by two sources:
As detailed in Section “Hardware Watchdog Timer”, page 84, 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 capaci-
tor or power-supply supervisor circuit, a 1 kΩ resistor must be added as shown Figure 10-3.
• Internal POR/PFD
• Hardware watchdog timer
RST
RST
Watchdog
Watchdog
Hardware
a. RST input circuitry
Monitor
VSS
Power
PCA
CC
as shown in Figure 10-2. Resistor value and input
To internal reset
b. Power-on Reset
Internal Reset
VDD
+
RST
4235K–8051–05/08

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