W77C516

Preliminary W77C516 8 BIT MICROCONTROLLER GENERAL DESCRIPTION The W77C516 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 W77C516 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 W77C516 is a fully static CMOS design; it can also be operated at a lower crystal clock. The W77C516 provides operating voltage from 4.5V to 5.5V. All W77C516 types also support on-chip 1KB SRAM without external memory component and glue logic, saving more I/O pins for users application usage if they use on-chip SRAM instead of external SRAM. 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 64KB on-chip Mask-ROM Four 8-bit I/O Ports One extra 4-bit I/O port 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 256 bytes scra...