W78L812A24DL - 8-Bit 24MHz 8051 MCU | Nuvoton
MPN: W78L812A24DL ✓ نشطW78L812A24DL نظرة عامة
An 8-bit microcontroller is a programmable semiconductor designed for embedded control. The W78 series combines an 8051-compatible core, program memory, data memory, and peripherals in one device. Within the embedded-control hierarchy, the W78L812A24DL is an MCU, or microcontroller unit, intended to execute firmware that monitors inputs and controls outputs in appliances, industrial equipment, and compact automation systems.
Key features include 8 KB of flash program memory organized as 8K x 8, a maximum clock frequency of 24 MHz, and 32 I/O lines. EBI/EMI and UART/USART interfaces provide external-memory and serial-communication options, while integrated LED and watchdog-timer functions support status indication and system supervision. The stated 2.4 V to 5.5 V operating-voltage range also supports compatibility with common embedded power rails.
The device uses an 8-bit data path and an 8051-compatible processor core. Its flash memory permits firmware to be programmed and updated without an external program-memory device, simplifying both production and maintenance. The 40-DIP mechanical package facilitates through-hole assembly and prototyping, although its larger footprint is less suitable for compact surface-mount products than smaller microcontroller packages.
Typical applications include appliance controllers, LED status and sequencing systems, industrial control panels, small motor or relay interfaces, serial-connected embedded modules, and educational 8051 platforms. Designers should confirm RAM capacity, detailed timer and peripheral assignments, clock behavior, and all electrical limits against the manufacturer datasheet before creating a production PCB.
For a new design, verify the 40-pin footprint, oscillator requirements, reset behavior, and available I/O functions. The DIP package simplifies breadboard and through-hole prototypes, but a high-density production design may require a different package variant and a corresponding PCB redesign.
This product page consolidates the confirmed operating specifications, interface capabilities, application guidance, sourcing path, and drop-in-replacement status for engineers evaluating the W78L812A24DL.
بدائل مباشرة لـ W78L812A24DL — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
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اطلب بدائلW78L812A24DL الحدود القصوى والخصائص الكهربائية
| Microcontroller Type | 8-bit 8051-compatible microcontroller |
| Core Processor | 8051 |
| Core Size | 8-bit |
| أقصى تردد للساعة | 24 MHz |
| Program Memory Size | 8 KB (8K x 8) |
| Program Memory Type | Flash |
| Operating Voltage Range | 2.4 V to 5.5 V |
| Number of I/O Pins | 32 |
| External Bus Interface | EBI/EMI |
| Serial Interface | UART/USART |
| Integrated Peripheral Functions | LED and watchdog timer (WDT) |
| العلبة | 40-pin DIP |
| نوع التركيب | Through-hole |
| Part Status | Active |
| Lead-Free Status | Pb-free |
دليل تكوين أطراف W78L812A24DL 40-pin dip
تكوين الأطراف لـ W78L812A24DL (حزمة 40-pin dip). تتضمن هذه الدائرة المتكاملة الرقمية GPIO وواجهات الاتصال (UART وSPI وI2C) وأطراف الطاقة. راجع ورقة بيانات الشركة المصنعة لوظائف الأطراف البديلة وخيارات التكوين. ضرورية لتصميم الأنظمة المدمجة وتخطيط PCB.
لا تتوفر بيانات مفصلة لمخطط التوصيلات لـ W78L812A24DL.
راجع ورقة البيانات للحصول على تكوين الأطراف الكامل.
التطبيقات النموذجية
W78L812A24DL مناسب لـ 6 التطبيقs: Appliance Control Panels, LED Sequencing and Indicators, Industrial Interface Modules, Serial Sensor Controllers, Education and 8051 Prototyping, Embedded Automation Controllers.
Appliance Control Panels
The W78L812A24DL fits an appliance control panel requiring an 8-bit controller, 8 KB of onboard flash, 32 I/O lines, and serial communication. Its 24 MHz 8051-compatible core can manage button inputs, LEDs, relay-control logic, and status reporting within one embedded design. The 40-pin DIP package is particularly convenient for prototypes, appliance test fixtures, and through-hole production runs where manual assembly and easy access to I/O are priorities. The 2.4 V to 5.5 V operating range also allows use with common low-voltage logic systems. Confirm the exact I/O multiplexing and peripheral assignments in the manufacturer datasheet before assigning high-current loads, since the MCU pins should be paired with suitable driver circuitry rather than driving loads directly.
LED Sequencing and Indicators
The W78L812A24DL is suitable for LED sequencing, diagnostic indicators, and multistep status displays because the manufacturer lists LED functions and the device provides 32 I/O pins. Its 24 MHz clock rate supports responsive firmware updates, debouncing, and visual timing sequences, while 8 KB of flash provides dedicated program storage for control tables and animation logic. The 8051-compatible architecture is familiar in embedded-control environments, which can simplify firmware maintenance for established 8051 platforms. Use suitable current-limiting resistors and confirm whether each LED function has a dedicated output or shares a general-purpose port. For dense displays, external driver ICs may be preferable because a 40-pin DIP controller has limited routing space for a large number of individually addressed LEDs.
Industrial Interface Modules
The W78L812A24DL can serve as the controller in a compact industrial interface module that converts local inputs and serial commands into control outputs. Its EBI/EMI interface offers a route to external bus or memory expansion, while UART/USART supports communication with sensors, converters, or an upstream controller. The 24 MHz processor speed and 8 KB flash capacity are appropriate for deterministic supervisory logic, and the integrated watchdog timer supports recovery from firmware or communication faults. The 40-pin DIP format makes the module straightforward to prototype, replace, and service. The 2.4 V to 5.5 V supply range supports 3.3 V and 5 V system rails, but grounding, isolation, protection, and environmental requirements must be addressed separately for deployment in industrial environments.
Serial Sensor Controllers
The W78L812A24DL fits a serial sensor-controller design where a UART/USART connection is needed alongside discrete digital outputs. Firmware can read commands, validate sensor responses, update indicator LEDs, and drive relays or logic-level enable inputs. Its 8-bit core and 24 MHz maximum clock provide sufficient throughput for many low-bandwidth measurement and supervisory tasks, while 8 KB of flash eliminates a separate program-memory component. The watchdog timer can restart the controller if firmware stops responding, improving system robustness. Confirm the complete serial electrical specification and available port pins in the manufacturer datasheet, and use an appropriate level translator when the sensor interface uses a voltage outside the W78L812A24DL operating range.
Education and 8051 Prototyping
The W78L812A24DL is well suited to education, training, and 8051 prototyping because it combines an established 8051-compatible core with flash memory in an accessible 40-pin DIP package. Students can connect LEDs, switches, displays, and serial modules directly through the I/O and UART/USART resources while learning interrupt-driven firmware, timing, and external-bus concepts. Its 2.4 V to 5.5 V operating range makes it workable in both 3.3 V and 5 V laboratory exercises, subject to careful signal compatibility. The large through-hole footprint is easy to insert into breadboards and sockets, although it consumes more board area than modern surface-mount MCUs. Check the manufacturer pin description and memory map before beginning laboratory exercises.
Embedded Automation Controllers
The W78L812A24DL can be used in small embedded automation controllers that combine local I/O, status indication, and a serial command interface. Its 24 MHz 8051-compatible core can execute control sequencing, event handling, and communication routines, while the 32 available I/O pins support inputs, outputs, and interlocks. Flash program storage simplifies firmware updates, and the watchdog timer offers basic supervisory protection in unattended equipment. The 40-pin DIP package is advantageous for rapid assembly and field replacement but may be excessive in a miniaturized controller. Designers should account for the limited package space, verify RAM and EEPROM requirements, and use external drivers or interface expanders when the application needs more I/O than the direct pin assignments can provide.
بيانات مرجعية هندسية لـ W78L812A24DL — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج |
|---|---|
| Brand | Nuvoton Technology Corporation |
| Package | 40-pin DIP |
| Core Processor | 8051 |
| Core Size | 8-bit |
| Maximum Clock Frequency | 24 MHz |
| Program Memory Size | 8 KB (8K x 8) |
| Program Memory Type | Flash |
| Operating Voltage Range | 2.4 V to 5.5 V |
| Number of I/O Pins | 32 |
| Serial Interface | UART/USART |
| External Bus Interface | EBI/EMI |
| Integrated Peripherals | LED and watchdog timer |
أبرز الفروقات
- Integrated flash avoids an external program-memory device (مقابلConventional 8051 designs requiring external program memory)
- 24 MHz clock supports responsive embedded-control execution (مقابلLower-clock 8051-compatible controller designs)
- Broad I/O and peripheral integration in one package (مقابلMinimal 8051 implementations requiring multiple support ICs)
ملاحظات التصميم
Design the PCB around the exact 40-pin DIP footprint and verify every signal against the manufacturer pin-description table. Keep the oscillator, reset network, and decoupling connections short, and provide clean ground return paths to all VSS pins. Because the complete pin map is not reproduced on this page, use the manufacturer document as the routing authority rather than inferring pin functions from another 8051 device.
Design the supply path for the documented 2.4 V to 5.5 V operating range. Place the regulator output and the MCU's required local decoupling components close to the power pins, use a low-impedance ground plane, and keep switching-regulator switching nodes away from oscillator and serial-signal routing. Confirm whether the oscillator and I/O structures require particular clock or input levels in the electrical-characteristics section.
Do not treat compatibility with the 8051 instruction set as proof that another MCU is a drop-in replacement. A W78L812A24DL replacement must also reproduce the 40-pin assignments, reset behavior, oscillator configuration, 8 KB flash organization, available RAM, EBI/EMI functions, UART/USART functions, and peripheral assignments. Verify any candidate with a complete pin and timing comparison before changing an approved PCB.
Route UART/USART signals away from the oscillator and switching-power nodes, and provide a common low-impedance ground reference for the MCU, external bus devices, and serial transceiver. If EBI/EMI is used, inspect the manufacturer's timing requirements and leave appropriate routing space in the 40-pin layout. Prototype on a solderable board rather than relying solely on a loose breadboard when bus timing or reset behavior matters.
معلومات الامتثال
The manufacturer listing identifies the W78L812A24DL as Pb-free. RoHS, REACH, halogen-free, and conflict-minerals status were not established from the available product information. AEC-Q100 status is not applicable to the listed general-purpose microcontroller.