AT89C51ED2-SLSUM Atmel, AT89C51ED2-SLSUM Datasheet - Page 26
![IC 8051 MCU FLASH 64K 44PLCC](/photos/6/70/67043/453-44-plcc_sml.jpg)
AT89C51ED2-SLSUM
Manufacturer Part Number
AT89C51ED2-SLSUM
Description
IC 8051 MCU FLASH 64K 44PLCC
Manufacturer
Atmel
Series
89Cr
Datasheet
1.ATWEBDVK-02RC.pdf
(137 pages)
Specifications of AT89C51ED2-SLSUM
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
Eeprom Size
2K x 8
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
Package
44PLCC
Device Core
8051
Family Name
89C
Maximum Speed
40 MHz
Operating Supply Voltage
3.3|5 V
Data Bus Width
8 Bit
Number Of Programmable I/os
34
Interface Type
SPI/UART
Number Of Timers
3
Processor Series
AT89x
Core
8051
Data Ram Size
2 KB
Maximum Clock Frequency
40 MHz
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Minimum Operating Temperature
- 40 C
Cpu Family
AT89
Device Core Size
8b
Frequency (max)
40MHz
Total Internal Ram Size
2KB
# I/os (max)
34
Number Of Timers - General Purpose
3
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
2.7V
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
44
Package Type
PLCC
For Use With
AT89OCD-01 - USB EMULATOR FOR AT8XC51 MCU
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT89C51ED2-SLSUM
Manufacturer:
MITSUBISHI
Quantity:
43
Part Number:
AT89C51ED2-SLSUM
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
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