W78L812A24FL - 8-Bit 24MHz 8051 Flash MCU | Nuvoton
Артикул: W78L812A24FL ✓ АктивенW78L812A24FL Обзор
An 8051-compatible microcontroller is a compact embedded-control device built around the classic MCS-51 instruction set. Microcontrollers combine a CPU, program memory, data memory, timers, serial communication, and digital I/O on one integrated circuit. This integration allows control systems to monitor inputs, execute embedded software, operate timers, and exchange serial data without requiring a separate processor and supporting components.
The W78L812A24FL combines 8 KB of Flash EPROM with 256 bytes of RAM, providing useful program storage for compact embedded applications. Its four 8-bit ports and dedicated P4 port offer multiple digital interfaces, while the three 16-bit timer/counters support periodic events, timing measurements, and waveform generation. The hardware watchdog timer adds an independent mechanism for recovering from stalled program execution.
The 24 MHz operating frequency provides a higher instruction-processing rate than lower-frequency members of the same device family while retaining standard 8051 instruction-set compatibility. This makes the device suitable for designs based on established 8051 firmware, industrial controllers, compact instruments, appliance controls, and general-purpose embedded products requiring deterministic digital I/O.
Typical uses include motor and actuator sequencing, temperature-instrument signal acquisition, keypad interfaces, LED status panels, programmable timers, and serial-connected control modules. The 2.4 V to 5.5 V operating range supports both lower-voltage and conventional 5 V designs, allowing system designers to choose the MCU around the power architecture of the finished product.
PCB design should preserve stable supply decoupling near the power pins and route the oscillator, reset, and high-speed signals according to the manufacturer reference layout. Because the device offers limited RAM, firmware should use the available data memory carefully. Firmware development also benefits from 8051-compatible tools because the instruction set remains compatible with the standard 8051 architecture.
This page organizes the principal electrical, memory, peripheral, package, and application characteristics of the W78L812A24FL. It also identifies same-family alternatives and explains the practical distinctions that matter when evaluating an 8051-compatible control IC for an embedded product.
Аналоги без доработки для W78L812A24FL — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
W78L812A16FL
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
W78L812A20FL
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
W78L812A28FL
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
W78L812A24FL Максимальные параметры и электрические характеристики
| Product Type | 8-bit Flash Microcontroller |
| CPU Architecture | 8051-compatible |
| Maximum CPU Frequency | 24 MHz |
| Program Memory | 8 KB Flash EPROM |
| Data Memory | 256 bytes RAM |
| Operating Voltage Range | 2.4 V to 5.5 V |
| General-Purpose I/O Ports | 4 ports, 8 bits each |
| Additional I/O Port | 1 port, 5 bits |
| Timer/Counter Count | 3 timers/counters, 16-bit each |
| Watchdog Timer | Hardware watchdog timer |
| Serial Interface | 1 serial port |
| Корпус | 44-pin QFP |
| Число выводов | 44 pins |
| RoHS Compliance | Compliant |
| Word Size | 8 bits |
| Instruction Set Compatibility | Standard 8051-compatible instruction set |
Руководство по цоколевке W78L812A24FL в корпусе 44-pin qfp
Цоколевка для W78L812A24FL (корпус 44-pin qfp). Эта цифровая ИС включает выводы GPIO, интерфейсы связи (UART, SPI, I2C) и выводы питания. Обратитесь к техническому описанию производителя для альтернативных функций выводов и вариантов конфигурации. Необходимо для проектирования встраиваемых систем и трассировки печатных плат.
Нет подробных данных о распиновке для W78L812A24FL.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
W78L812A24FL подходит для 6 применениеs: Industrial Control Panels, Temperature Instrument Controller, Appliance and Motor Sequencer, LED Display Controller, Serial Data Acquisition Module, Embedded Communication Module.
Industrial Control Panels
The W78L812A24FL fits industrial control-panel logic that combines push-button inputs, status LEDs, timing functions, and a wired control link. Its four 8-bit bidirectional ports plus the 5-bit P4 port provide flexible digital signal routing, while three 16-bit timer/counters can handle scan intervals, delays, and periodic maintenance tasks. The 24 MHz clock gives the 8051-compatible CPU additional execution margin over 16 MHz and 20 MHz family members. At the same time, the 256-byte RAM requires disciplined allocation, and the 8 KB Flash limit favors compact, event-driven firmware rather than large graphical interfaces.
Рекомендуется
Temperature Instrument Controller
The W78L812A24FL can control a compact temperature-measurement instrument that samples sensors, drives a numerical display, handles operator keys, and records measurements through a serial link. Its three 16-bit timer/counters support accurate sampling intervals and input timing, while the serial port provides communication with a host computer or data logger. Operating from 2.4 V to 5.5 V gives flexibility for compact battery-assisted instruments and conventional 5 V laboratory equipment. Firmware must accommodate only 256 bytes of RAM and 8 KB of Flash, favoring compact display buffers and interrupt-driven sampling.
Рекомендуется
Appliance and Motor Sequencer
The W78L812A24FL is suitable for appliance controls and small motor or actuator sequencers where deterministic timing, digital interlocks, and fault recovery are required. Three 16-bit timer/counters can generate operating intervals, while the hardware watchdog timer provides a recovery path after firmware stalls. The 8051-compatible instruction set supports established control routines, and the 24 MHz operating rate improves execution margin in polling and debounce routines. Designers should size motor-driving circuitry outside the MCU, preserve logic-level compatibility across its 8-bit ports, and account for the limited 256-byte RAM during state-machine design.
Рекомендуется
LED Display Controller
The W78L812A24FL can drive an LED status panel, sign controller, or sequencing display using its parallel I/O ports and timer resources. Four 8-bit ports and the dedicated 5-bit P4 port allow multiplexed display rows and columns to be connected without another general-purpose logic device. At 24 MHz, the MCU provides useful cycle headroom for display refresh and serial update tasks compared with the 16 MHz family option. The design should minimize refresh overhead, multiplex current appropriately, and use timer-based scheduling to avoid blocking delays that reduce responsiveness.
Рекомендуется
Serial Data Acquisition Module
The W78L812A24FL is well suited to a compact data-acquisition module that receives sensor or command data through its serial port and distributes control signals through the parallel ports. The 24 MHz 8051-compatible core supports protocol handling and moderate processing loads, while the three timers can establish sampling periods and timeout intervals. Its 2.4 V minimum operating voltage allows integration into lower-voltage portable equipment, although power budgeting and regulator selection remain external design tasks. Firmware should use buffered, interrupt-driven serial reception to protect the limited 256-byte RAM from variable-length input.
Рекомендуется
Embedded Communication Module
The W78L812A24FL can serve as the control MCU in a small embedded communication module that connects a simple sensor, switch, or indicator network to a host through the serial port. Its 8051-compatible architecture allows reuse of established communication routines, while the 24 MHz clock provides more execution headroom than lower-frequency family members. Three timer/counters support baud-rate generation, periodic synchronization, and receive timeouts. Because only 256 bytes of RAM and 8 KB of Flash are available, the application should minimize copied buffers and use a compact protocol; hardware flow control and ESD protection should be added where required by the interface environment.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для W78L812A24FL — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | W78L812A16FL | W78L812A20FL | W78L812A28FL |
|---|---|---|---|---|
| Brand | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation |
| Package | QFP-44 (44-pin) | QFP-44 (44-pin) | QFP-44 (44-pin) | QFP-44 (44-pin) |
| Maximum CPU Frequency | 24 MHz | 16 MHz | 20 MHz | 28 MHz |
| CPU Architecture | 8051-compatible | 8051-compatible | 8051-compatible | 8051-compatible |
Ключевые отличия
- Balanced CPU timing margin in the W78L812 family (против W78L812A20FL)
- Higher timing rate than the lower-frequency family option (против W78L812A16FL)
- Lower clock rate than the higher-frequency family option (против W78L812A28FL)
Заметки по проектированию
Place the decoupling capacitor immediately between the device supply and ground pins, with the shortest possible ground return. Keep oscillator routing compact and away from switching nodes and high-current relay or motor traces. Route the 44 QFP lands according to the manufacturer footprint, and inspect the assembled board for solder bridges because closely spaced leads can complicate rework.
Validate the power rail across the complete 2.4 V to 5.5 V operating range and account for startup current when the external circuitry activates. The MCU can share a regulated rail with compatible sensors and logic, but motors, heaters, and high-current LEDs should use separate switching or driver stages. Confirm that external pull-up and pull-down networks do not create excessive static or dynamic current on any 8-bit I/O port.
Do not assume that identical package dimensions guarantee identical firmware behavior. Before replacing W78L812A24FL with a 16 MHz, 20 MHz, or 28 MHz family member, compare oscillator settings, timer periods, serial timing, interrupt priorities, and startup behavior. Also review the 8 KB Flash and 256-byte RAM constraints, because code or buffer assumptions that work in one firmware build may overflow when optimization settings or diagnostic features change.
Treat the oscillator, reset, and serial signals as the most sensitive interconnects on the board. Keep them short, use a stable ground reference, and avoid routing them alongside switching-node or high-current outputs. The serial port may be used for an external host connection, so confirm logic levels, baud-rate tolerance, grounding, and any required isolation or protection before connecting equipment outside the controller enclosure.
Информация о соответствии
The product listing identifies W78L812A24FL as RoHS compliant. No additional compliance claims are stated.