W78L032A24PL - 8-Bit ROMless 24MHz Microcontroller | Nuvoton
MPN： W78L032A24PL ✓ 啟用中W78L032A24PL 概覽
The W78L032A24PL is a ROMless microcontroller, meaning application firmware must be stored in external memory. This architecture can be useful in low-cost systems, industrial controllers, appliances, instrumentation, and legacy-compatible embedded platforms where a dedicated external ROM or Flash memory is acceptable. The 24 MHz operating speed supports more responsive control loops than slower 8-bit designs, while the 256-byte internal RAM provides working memory for variables, stack operations, and peripheral data handling.
The 32 available I/O lines make the device suitable for products that require multiple digital inputs and outputs, such as keypads, indicators, relays, displays, sensors, and communication transceivers. The 44-pin PLCC package provides a leaded surface-mount format with a defined J-lead footprint and adequate board spacing for inspection and rework. The package designation indicates the PLCC configuration, while the exact pin assignment and electrical limits should be confirmed against the manufacturer datasheet before layout or firmware development.
The internal peripheral set includes three 16-bit timer/counters, which can support timing, counting, pulse measurement, and periodic service functions. A serial port adds a basic serial communication resource, and the two-level, six-source interrupt capability allows multiple internal events to be prioritized. These resources make the W78L032A24PL appropriate for embedded control logic that is more parallel and timer-oriented than a minimal modern 8-bit MCU.
Because the W78L032A24PL is ROMless, the system designer must provide external program memory and ensure that the memory interface, address decoding, timing, and reset behavior are correctly implemented. Firmware development also depends on the supported toolchain and device-specific interrupt and peripheral definitions. Use the manufacturer datasheet for the complete pin description, electrical characteristics, external-memory requirements, timing diagrams, and recommended application circuit.
This page combines the verified device identity and electrical highlights with practical replacement and design guidance. It focuses on the W78L032A24PL as a 44-pin, 24 MHz, ROMless 8-bit microcontroller rather than a generic 8-bit controller, allowing engineers to compare packaging, memory architecture, peripheral availability, and sourcing constraints before committing to a PCB design.
直接替換替代品，適用於 W78L032A24PL — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： W78L032A24PL （相同外形與佔位） — 差異在於 Mounting Type, Oscillator Type, Package, Series.
W78L032A24DL
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →W78L032A24PL
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →W78L032A24PL 最大額定值與電氣特性
| Product Type | 8-bit ROMless microcontroller |
| Series | W78 series |
| Core | 80C32-compatible W78 architecture |
| Operating Frequency | 24 MHz |
| RAM Size | 256 x 8 bits |
| Number of I/O Pins | 32 |
| Parallel Ports | 4 x 8-bit bidirectional parallel ports |
| Timer/Counter Resources | 3 x 16-bit timer/counters |
| Serial Port | 1 serial port |
| Interrupt Structure | 6-source, 2-level interrupt capability |
| Oscillator Type | Internal oscillator |
| 封裝 | 44-pin PLCC (J-Lead) |
| Package Family | PLCC |
| 安裝類型 | Surface mount |
| RoHS 狀態 | ROHS3 compliant |
W78L032A24PL plcc 腳位配置指南
W78L032A24PL（plcc 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： W78L032A24PL.
請參閱 資料表 以查看完整腳位配置。
典型應用
W78L032A24PL 適用於 6 應用s: Industrial Appliance Controller, Legacy-compatible Embedded Control, Timer-based Sequencer, Instrumentation and Data Acquisition Front End, Keypad, Display, and Human-interface Controller, Communication Interface Controller.
Industrial Appliance Controller
The W78L032A24PL fits appliance and industrial sequencing designs that need many parallel control lines, three 16-bit timer/counters, and external program storage. Its four 8-bit bidirectional ports can connect relays, indicators, switches, and discrete sensors, while the 24 MHz core provides responsive task timing. The ROMless architecture allows firmware to be updated in an external memory device, which can be useful during manufacturing or field updates. Designers should verify external-memory timing and address decoding in the manufacturer datasheet before committing the PCB layout.
推薦
Legacy-compatible Embedded Control
The W78L032A24PL is a practical choice for maintaining or cloning an existing 80C32-compatible control design that expects a 24 MHz clock, 256-byte RAM, four parallel ports, and a serial port. ROMless operation is valuable when program storage is already implemented externally or when the product program benefits from a separately managed memory device. Firmware portability must be checked because peripheral register layouts, interrupt vectors, and external bus timing are device-specific. A hardware refresh should preserve the original 44-pin PLCC footprint whenever possible.
推薦
Timer-based Sequencer
The three 16-bit timer/counters in the W78L032A24PL support applications built around precise event counting, periodic service routines, pulse-width measurement, and multi-stage sequencing. The 32 I/O lines can drive stepper-control signals, solenoid drivers, status indicators, and interlock inputs. At 24 MHz, the device offers useful timing headroom for coordinating several sequential functions while retaining an external-memory-based architecture. Validate timer operating modes and interrupt latency against the specific firmware requirements, because the controller must support the original timing assumptions.
推薦
Instrumentation and Data Acquisition Front End
The W78L032A24PL can serve as a legacy-compatible front-end controller in instrumentation systems requiring parallel sensor inputs, digital control outputs, and timed measurement sequences. Four 8-bit ports allow multiplexing of switch closures, digital sensor buses, front-panel controls, and alarm outputs without a large external I/O expander. The serial port can connect the controller to a host or measurement subsystem. Designers should define input thresholds, settling delays, and interrupt priorities in firmware and confirm the electrical limits for each connected signal.
推薦
Keypad, Display, and Human-interface Controller
The W78L032A24PL is suitable for human-interface modules that scan key matrices, drive segmented or multiplexed indicators, and coordinate serial status reporting. Its parallel ports provide direct connections for keypad rows and columns, while timer resources can debounce inputs and schedule display updates. The 24 MHz operating rate helps separate scanning, communication, and control tasks. Firmware must account for the device's limited 256-byte RAM and should avoid large display buffers or blocking routines that could degrade input responsiveness.
推薦
Communication Interface Controller
The W78L032A24PL can act as a dedicated protocol or communication controller when a system needs legacy 8-bit processing alongside parallel I/O. Its serial port provides a basic communication resource, while the 24 MHz clock and timer/counter bank can support framing, timeouts, and scheduled transmission tasks. The external program-memory architecture is useful for protocol firmware that can be revised independently of the surrounding controller. Confirm serial levels, baud-rate support, and interrupt behavior with the manufacturer datasheet before selecting external transceivers.
推薦
推薦產品摘要
工程參考資料，適用於 W78L032A24PL — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | W78L032A24DL | W78L032A24PL |
|---|---|---|---|
| Manufacturer | Nuvoton Technology Corporation | Nuvoton | Nuvoton |
| Package | 44-pin PLCC (J-Lead) | 44-pin PLCC (J-Lead) | 44-pin PLCC (J-Lead) |
| Product Type | 8-bit ROMless microcontroller | 8-bit ROMless W78-family microcontroller | 8-bit ROMless W78-family microcontroller |
主要差異化特點
- Documented W78/80C32-compatible control architecture (對比W78L032A24DL)
- Parallel I/O density for legacy control systems (對比W78L032A24PL)
- Dedicated timing resources (對比W78L032A24DL)
- External-program-memory architecture (對比W78L032A24PL)
設計說明
Do not treat the 24 MHz clock rating as permission to use an external-memory bus without verification. The W78L032A24PL is ROMless, so the external memory interface must meet the device's address, data, and timing requirements. Check reset behavior, address decoding, memory enable signals, and access-cycle assumptions against the manufacturer datasheet before routing the board.
Keep the 44-pin PLCC footprint and pin numbering centered on the component origin, with the J-lead orientation defined by the package drawing. Leave access around the package for inspection and rework, and avoid placing tall components where they interfere with lead removal. Verify the land pattern and pin-one location against the actual package drawing rather than a generic PLCC footprint.
Route the external-program-memory bus with short, controlled traces and provide nearby decoupling according to the manufacturer's recommended application circuit. Place the crystal or oscillator circuitry, if used, close to the device and follow the datasheet grounding recommendations. Because the verified record identifies an internal oscillator, confirm the intended clock source and external components before finalizing the layout.
Use the datasheet pin descriptions to map all port, timer, serial, reset, power, and ground signals; the verified listing identifies 32 I/O lines but does not reproduce the complete pin assignment. In particular, do not infer the PLCC pinout solely from the I/O count. Validate pull-ups, unused inputs, reset polarity, and interface direction in the final schematic and firmware initialization sequence.
合規資訊
The verified product information identifies the device as ROHS3 compliant. REACH, halogen-free, conflict-minerals, and automotive qualification status are not established in the available records.
