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W79E549A40PL Datasheet(PDF) 3 Page - Winbond |
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W79E549A40PL Datasheet(HTML) 3 Page - Winbond |
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3 / 81 page  W79E549/W79L549 Publication Release Date: December 11, 2005 - 3 - Revision A1 1. GENERAL DESCRIPTION The W79E(L)549 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)549 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)549 is a fully static CMOS design; it can also be operated at a lower crystal clock. The W79E(L)549 contains In-System Programmable (ISP) 32 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 Pin compatible with standard 80C52 Instruction-set compatible with MCS-51 Seven 8-bit I/O Ports; Port 0 has internal pull-up resisters enabled by software One extra 4-bit I/O port, chip select Three 16-bit Timers 7 interrupt sources with two levels of priority On-chip oscillator and clock circuitry One enhanced full duplex serial port 32KB In-System Programmable Flash EPROM 4KB Auxiliary Flash EPROM for loader program (LDFlash) 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: W79E549A40PN, W79L549A25PN − Lead Free (RoHS)PLCC 68: W79E549A40PL, W79L549A25PL |
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