W77E058A40PL

Product Summary

The W77E058 features a faster running and better performance 8-bit CPU with a redesigned core
processor without wasted clock and memory cycles. it improves the performance not just by running at
high frequency but also by reducing the machine cycle duration from the standard 8052 period of
twelve clocks to four clock cycles for the majority of instructions. This improves performance by an
average of 1.5 to 3 times. The W77E058 also provi des dual Data Pointers (DPTRs) to speed up block
data memory transfers. It can also adjust the durati on of the MOVX instruction (access to off-chip data
memory) between two machine cycles and nine machine cycles. This flexibility allows the W77E058 to
work efficiently with both fast and slow RAMs and peripheral devices. In addition, the W77E058
contains on-chip 1KB MOVX SRAM, the address of which is between 0000H and 03FFH. It only can
be accessed by MOVX instruction; this on-chip SRAM is optional under software control.

Parametrics

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
? 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
? 32 KB Flash EPROM
? 256 bytes scratch-pad RAM
? 1 KB on-chip SRAM for MOVX instruction
? Programmable Watchdog Timer
? Dual 16-bit Data Pointers
? Software programmable access cycle to external RAM/peripherals
? Packages:
? Lead Free(RoHS) DIP 40: W77E058A40DL
? Lead Free(RoHS) PLCC 44: W77E058A40PL
? Lead Free(RoHS) PQFP 44: W77E058A40FL

Features

The W77E058 is a fast 8051 compatible microcontroller with a redesigned processor core without
wasted clock and memory cycles. As a result, it executes every 8051 instru ction faster than the
original 8051 for the same crystal speed. Typically, t he instruction executing time of W77E058 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
W77E058 is a fully static CMOS design; it can also be operated at a lower crystal clock. The
W77E058 contains 32 KB Flash EPROM, and provides operating voltage from 4.5V to 5.5V. All
W77E058 types also support on-chip 1 KB 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.