
4289C–8051–11/05
1
Features
80C52 Compatible
– 8051 Instruction Compatible
– Six 8-bit I/O Ports (64 pins or 68 Pins Versions)
– Four 8-bit I/O Ports (44 Pins Version)
– Three 16-bit Timer/Counters
– 256 bytes Scratch Pad RAM
– 10 Interrupt Sources With 4 Priority Levels
ISP (In-System Programming) Using Standard V
CC Power Supply
Integrated Power Monitor (POR/PFD) to Supervise Internal Power Supply
Boot ROM Contains Low Level Flash Programming Routines and a Default Serial
Loader
High-speed Architecture
– In Standard Mode:
40 MHz (Vcc 2.7V to 5.5V, Both Internal and External Code Execution)
60 MHz (Vcc 4.5V to 5.5V and Internal Code Execution Only)
– In X2 Mode (6 Clocks/Machine Cycle)
20 MHz (Vcc 2.7V to 5.5V, Both Internal and External Code Execution)
30 MHz (Vcc 4.5V to 5.5V and Internal Code Execution Only)
64K bytes On-chip Flash Program/Data Memory
– Byte and Page (128 bytes) Erase and Write
– 100k Write Cycles
On-chip 1792 bytes Expanded RAM (XRAM)
– Software Selectable Size (0, 256, 512, 768, 1024, 1792 bytes)
– 768 bytes Selected at Reset for T89C51RD2 Compatibility
On-chip 2048 bytes EEPROM block for Data Storage
– 100k Write Cycles
Dual Data Pointer
32 KHz Crystal Oscillator
Variable Length MOVX for Slow RAM/Peripherals
Improved X2 Mode with Independant Selection for CPU and Each Peripheral
Keyboard Interrupt Interface on Port 1
SPI Interface (Master/Slave Mode)
8-bit Clock Prescaler
Two Wire Interface 400K bit/s
Programmable Counter Array with:
– High Speed Output
– Compare/Capture
– Pulse Width Modulator
– Watchdog Timer Capabilities
Asynchronous Port Reset
Full Duplex Enhanced UART with Dedicated Internal Baud Rate Generator
Low EMI (inhibit ALE)
Hardware Watchdog Timer (One-time Enabled with Reset-Out), Power-Off Flag
Power Control Modes: Idle Mode, Power-down Mode
Power Supply: 2.7V to 5.5V
Temperature Ranges: Industrial (-40 to +85°C)
Packages: PLCC44, VQFP44
Description
AT89C51ID2 is a high performance CMOS Flash version of the 80C51 CMOS single
chip 8-bit microcontroller. It contains a 64 Kbytes Flash memory block for program
and for data.
The 64 Kbytes Flash memory can be programmed either in parallel mode or in serial
mode with the ISP capability or with software. The programming voltage is internally
generated from the standard V
CC pin.
8-bit Flash
Microcontroller
AT89C51ID2