GENERAL DESCRIPTION
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.

FEATURES
• 8-bit CMOS microcontroller
• 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)
• 64 Bytes Non-Volatile Memory for critical date storage.
• 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
• Packages:
    − Lead Free(RoHS) DIP 40: W77E532A40DL
    − Lead Free(RoHS) PLCC 44: W77E532A40PL
    − Lead Free(RoHS) QFP 44: W77E532A40FL