W79E217AFG
W79E217AFG - 8-bit 8051 MCU 64KB Flash 33MHz PQFP-100 | Nuvoton
The Nuvoton Technology Corporation W79E217AFG is an 8-bit 8051/8052-compatible microcontroller (MCU) with a redesigned processor core that eliminates wasted clock and memory cycles, delivering up to 33 MHz core frequency and integrating 64 KB (64K x 8) of on-chip Flash program memory. Housed in a 100-pin PQFP package, it operates from a single 5 V supply (with operating voltage range per datasheet) and is positioned as a drop-in upgrade for legacy 80C51/80C52 designs that need more code space, more I/O, and embedded Flash in-system programming (ISP).
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory (ROM/Flash), data memory (RAM), and peripherals such as timers, UARTs, ADC, GPIO, and interrupt controllers. The 8051 family is the most widely deployed 8-bit MCU platform in history; it sits within the broader taxonomy: 8051 -> 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. The W79E217AFG belongs to Nuvoton's W79 series of industrial-grade, Flash-based 8051 derivatives aimed at motor control, instrumentation, and human-machine interface (HMI) applications.
Key features of the W79E217AFG include the 33 MHz single-cycle enhanced 8052 core, 64 KB Flash, 256 + 1 KB on-chip SRAM, four 8-bit I/O ports (P0-P3), three 16-bit timers, two full-duplex UARTs, an 8-channel 10-bit ADC, an on-chip oscillator, watchdog timer, power-on reset, and brown-out detector. Industrial temperature range (-40 °C to +85 °C), PQFP-100 package with 84 usable I/O lines, and ISP via UART make it well-suited for embedded designs.
Architecturally, Nuvoton re-engineered the classic 8051 pipeline to remove the original 12-clock-per-machine-cycle penalty, allowing most instructions to complete in one clock. This typically yields 2x-3x throughput vs. legacy 80C51 at the same crystal frequency, while preserving binary compatibility with standard 8051 code, assemblers, and Keil C51 toolchains. The integrated 64 KB Flash also enables field updates without external EPROM.
Typical applications include industrial motor drives, AC/DC inverter controls, induction cooker controllers, smart appliance HMI panels, security alarm panels, and other 8051-based legacy designs that need to migrate from ROM/EPROM to Flash. The wide operating temperature range and large PQFP package with abundant I/O make it appropriate for human-interface boards that drive LEDs, keypads, and character/graphic LCDs.
When designing with this part, ensure your ISP tool is configured for the W79E217 family boot-loader entry mode and that decoupling is placed close to the analog AVSS/AVDD pins if the 10-bit ADC is used. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet alone.
USD $2.74
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