W79E648 Datasheet, PDF (2/80 Pages) Winbond – Fast 8051 Compatible microcontroller with a redesigned Processor

Preliminary W79E648
1. GENERAL DESCRIPTION
The W79E648 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 W79E648 is 1.5 to
3 times faster than 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
W79E648 is a fully static CMOS design; it can also be operated at a lower crystal clock. The
W79E648 contains In-System Programmable (ISP) 128 KB bank-addressed Flash EPROM; 4KB
auxiliary Flash EPROM for loader program; on-chip 1 KB MOVX SRAM; power saving modes.
2. FEATURES
• 8-bit CMOS microcontroller
• High speed architecture of 4 clocks/machine cycle runs up to 40 MHz
• Instruction-set compatible with MCS-51
• Seven 8-bit I/O Ports
• One extra 4-bit I/O ports, chip select, reboot fuction
• Three 16-bit Timers
• 7 interrupt sources with two levels of priority
• On-chip oscillator and clock circuitry
• One enhanced full duplex serial port
• Dual 64KB In-System Programmable Flash EPROM banks (AP Flash EPROM 0 and AP Flash
EPROM 1)
• 4KB Auxiliary Flash EPROM for loader program (LD Flash EPROM)
• 256 bytes scratch-pad RAM
• 1 KB on-chip SRAM for MOVX instruction
• Programmable Watchdog Timer
• 6 channels of 8 bit PWM
• Software Reset
• Software programmable access cycle to external RAM/peripherals
• Code protection
• Packages:
− PLCC 68: W79E648X40PX
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