W77IE58/W77I058A
1. GENERAL DESCRIPTION
The W77I058 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 W77I058 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
W77I058 is a fully static CMOS design; it can also be operated at a lower crystal clock. The W77I058
contains 32 KB Flash EPROM, and provides operating voltage from 2.7V to 5.5V. All W77I058 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.
2. FEATURES
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8-bit CMOS microcontroller
High speed architecture of 4 clocks/machine cycle runs up to 20 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:
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Lead Free (RoHS) DIP 40: W77I058A25DL
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Lead Free (RoHS) PLCC 44: W77I058A25PL
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