W79E548 Datasheet, PDF (3/79 Pages) Winbond – 8-BIT MICROCONTROLLER

W79E548/W79L548
1. GENERAL DESCRIPTION
The W79E(L)548 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 W79E(L)548 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
W79E(L)548 is a fully static CMOS design; it can also be operated at a lower crystal clock. The
W79E(L)548 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
y 8-bit CMOS microcontroller
y High speed architecture of 4 clocks/machine cycle
y Pin compatible with standard 80C52
y Instruction-set compatible with MCS-51
y Seven 8-bit I/O Ports; Port 0 has internal pull-up resisters enabled by software
y One extra 4-bit I/O port, chip select
y Three 16-bit Timers
y 7 interrupt sources with two levels of priority
y On-chip oscillator and clock circuitry
y One enhanced full duplex serial port
y Dual 64KB In-System Programmable Flash EPROM banks (APFlash0 and APFlash1)
y 4KB Auxiliary Flash EPROM for loader program (LDFlash)
y 256 bytes scratch-pad RAM
y 1 KB on-chip SRAM for MOVX instruction
y Programmable Watchdog Timer
y 6 channels of 8 bit PWM
y Software Reset
y Software programmable access cycle to external RAM/peripherals
y Code protection
y Packages:
− PLCC 68: W79E548A40PN, W79L548A25PN
− Lead Free (RoHS)PLCC 68: W79E548A40PL, W79L548A25PL
Publication Release Date: December 12, 2005
-3-
Revision A1