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AT83C51RB2 Datasheet

  • AT83C51RB2

  • 80C51 High Performance ROM 8-bit Microcontroller

  • 81頁

  • ATMEL   ATMEL

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Features
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80C52 Compatible
鈥?Four 8-bit I/O Ports
鈥?Three 16-bit Timer/Counters
鈥?256 Bytes Scratch Pad RAM
鈥?8 Interrupt Sources with 4 Priority Levels
鈥?Dual Data Pointer
Variable Length MOVX for Slow RAM/Peripherals
High-speed Architecture
鈥?10 to 40 MHz in Standard Mode
16K/32K Bytes On-Chip ROM Program
T80C51RD2 ROMless Versions
On-Chip 1024 bytes Expanded RAM (XRAM)
鈥?Software Selectable Size (0, 256, 512, 768, 1024 bytes)
鈥?256 Bytes Selected at Reset for AT87C51RB2/RC2 Compatibility
Keyboard Interrupt Interface on Port P1
8-bit Clock Prescaler
64K Program and Data Memory Spaces
Improved X2 Mode with Independant Selection for CPU and Each Peripheral
Programmable Counter Array 5 Channels with:
鈥?High-speed Output
鈥?Compare/Capture
鈥?Pulse Width Modulator
鈥?Watchdog Timer Capabilities
Asynchronous Port Reset
Full Duplex Enhanced UART
Dedicated Baud Rate Generator for UART
Low EMI (Inhibit ALE)
Hardware Watchdog Timer (One-time Enabled with Reset-out)
Power Control Modes
鈥?Idle Mode
鈥?Power-down Mode
鈥?Power-off Flag
Power Supply: 2.7V to 5.5V or 2.7V to 3.6V
Temperature Ranges: Commercial (0 to +70擄C) and Industrial (-40擄C to +85擄C)
Packages: PDIL40, PLCC44, VQFP44
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80C51 High
Performance
ROM 8-bit
Microcontroller
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AT80C51RD2
AT83C51RB2
AT83C51RC2
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Description
AT8xC51Rx2 microcontrollers are high performance ROM versions of the 80C51 8-bit
microcontrollers. They contain a 0K, 16K or 32K bytes ROM memory block for
program.
The microcontrollers retain all features of the Atmel 80C52 with 256 bytes of internal
RAM, a 7-source 4-level interrupt controller and three timer/counters.
In addition, the microcontrollers have a Programmable Counter Array, an XRAM of
1024 byte, a Hardware Watchdog Timer, a Keyboard Interface, a more versatile serial
channel that facilitates multiprocessor communication (EUART) and a speed improve-
ment mechanism (X2 mode).
The microcontrollers have 2 software-selectable modes of reduced activity and 8 bit
clock prescaler for further reduction in power consumption. In Idle mode, the CPU is
frozen while the peripherals and the interrupt system are still operating. In the Power-
down mode, the RAM is saved and all other functions are inoperative.
Rev. 4113A鈥?051鈥?9/02

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