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 W77E532A芯片解密及性能分析

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 The W77E532A is a fast 8051 compatible microcontroller with a redesigned processor core without wasted clock and memory cycles. As a result, it executes every 8051 instruction faster than the original 8051 for the same crystal speed. Typically, the instruction executing time of W77E532A is 1.5 to 3 times faster then that of traditional 8051, depending on the type of instruction. In general, the overall performance is about 2.5 times better than the original for the same crystal speed. Giving the same throughput with lower clock speed, power consumption has been improved. Consequently, the W77E532A is a fully static CMOS design; it can also be operated at a lower crystal clock. The W77E532A contains In-System Programmable(ISP) 128 KB bank-addressed Flash EPROM; 4KB auxiliary Flash EPROM for loader program; operating voltage from 4.5V to 5.5V; on-chip 1 KB MOVX SRAM; three power saving modes.

 
  8-bit CMOS microcontroller
 
  Wide supply voltage of 4.5V to 5.5V
 
  High speed architecture of 4 clocks/machine cycle runs up to 40 MHz
 
  Pin compatible with standard 80C52
 
  Instruction-set compatible with MCS-51
 
  Four 8-bit I/O Ports; Port 0 has internal pull-up resisters enabled by software
 
  One extra 4-bit I/O port, chip select and Wait State control signal (available on 44-pin PLCC/QFP package)
 
  Three 16-bit Timers
 
  12 interrupt sources with two levels of priority
 
  On-chip oscillator and clock circuitry
 
  Two enhanced full duplex serial ports
 
  Dual 64KB In-System Programmable Flash EPROM banks (APFLASH0 and APFLASH1)
 
  4KB Auxiliary Flash EPROM for loader program (LDFLASH)
 
  256 bytes scratch-pad RAM
 
  1 KB on-chip SRAM for MOVX instruction
 
  Programmable Watchdog Timer
 
  Software Reset
 
  Dual 16-bit Data Pointers
 
  Software programmable access cycle to external RAM/peripherals
 

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