CORE8051 USED IN EMBEDDED SYSTEM CONTROL

The Core8051 macro is a high-performance, single-chip, 8- bit microcontroller. It is a fully functional eight-bit embedded controller that executes all ASM51 instructions and has the same instruction set as the 80C31. Core8051 provides software and hardware interrupts, a serial port, and two timers. The Core8051 architecture eliminates redundant bus states and implements parallel execution of fetch and execution phases. Since a cycle is aligned with memory fetch when possible, most of the one-byte instructions are performed in a single cycle. Core8051 uses one clock per cycle. This leads to an average performance improvement rate of 8.0 (in terms of MIPS) with respect to the Intel device working with the same clock frequency. The original 8051 had a 12-clock architecture. A machine cycle needed 12 clocks, and most instructions were either one or two machine cycles. Therefore, the 8051 used either 12 or 24 clocks for each instruction, except for the MUL and DIV instructions. Furthermore, each cycle in the 8051 used two memory fetches. In many cases, the second fetch was a "dummy" fetch and extra clocks were wasted.

• 100% ASM51 (8051/80C31/80C51) Compatible Instruction Set1
• Control Unit
  • 8-Bit Instruction Decoder
  • Reduced Instruction Time of up to 12 Cycles
• Arithmetic Logic Unit
  • 8-Bit Arithmetic and Logical Operations
  • Boolean Manipulations
  • 8 by 8-Bit Multiplication and 8 by 8-Bit Division
• 32-Bit I/O Ports
  • Four 8-Bit I/O Ports
  • Alternate Port Functions, such as External Interrupts, Provide Extra Port Pins when Compared with the Standard 8051
• Serial Port
  • Simultaneous Transmit and Receive
  • Synchronous Mode, Fixed Baud Rate
  • 8-Bit UART Mode, Variable Baud Rate
  • 9-Bit UART Mode, Fixed Baud Rate
  • Multiprocessor Communication
• Two 16-Bit Timer/Counters
• Interrupt Controller
  • Four Priority Levels with 13 Interrupt Sources
• Internal Data Memory Interface
  • Can Address up to 256B of Data Memory Space
• External Memory Interface
  • Can Address up to 64kB of External Program Memory
  • Can Address up to 64kB of External Data Memory
  • Demultiplexed Address/Data Bus Enables Easy Connection to Memory
  • Variable Length MOVX to Access Fast/Slow RAM or Peripherals
• Special Function Register (SFR) Interface
• Optional On-Chip Instrumentation (OCI) Debug Logic
• Supports all Major Actel Device Families
• Optional Power-Saving Modes