MC908LJ12CPBE - 8-Bit HC08 MCU 12KB Flash 8MHz 64-LQFP | NXP
MPN: MC908LJ12CPBE ✗ Cuối đờiMC908LJ12CPBE Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/FLASH), data memory (RAM), and peripheral interfaces onto one silicon die. The M68HC08 family is a fully upward-compatible successor to the M6805, M146805, and M68HC05 architectures, allowing legacy assembly code to be reused with new peripherals and lower power. The HC08LJ sub-family specifically targets applications requiring on-chip LCD drivers and a small footprint, sitting within the broader NXP 8-bit MCU hierarchy (8-bit MCU -> microcontroller -> embedded processor -> semiconductor device).
Key features include 12KB user FLASH with security lock, up to 768 bytes of RAM, an 8 MHz internal bus, enhanced serial communications interface (ESCI), timer interface modules, keyboard interrupts, and an LCD driver peripheral block. The device supports both background-debug mode (BDM) and monitor-mode in-system programming for cost-effective field updates and OEM code development.
The HC08LJ12 die uses a CMOS process with low-power STOP and WAIT modes, regulated by an on-chip low-voltage inhibit (LVI) module that holds the CPU in reset when VDD falls below the operating threshold. Internal peripherals are memory-mapped, served by the CPU08 with 16-bit index/data stack architecture, supporting HCS08-compatible object code in transition paths.
Typical applications include white-goods and small-appliance controllers, simple consumer displays with LCD panels, building-automation sensor nodes, and industrial human-machine interface (HMI) sub-modules. The integrated LCD driver and broad I/O count (up to 51 GPIO) suit single-board products where display and keypad are co-located. Pair it with an external EEPROM for parameter storage and a low-cost digital temperature sensor for low-volume equipment.
When designing with this part, ensure the VDD decoupling network has a 100 nF ceramic placed within 5 mm of each supply pin and a bulk 4.7 uF tantalum or aluminum polymer on the rail. Use the BDM interface rather than monitor mode for production programming to save FLASH space; reserve monitor mode for engineering debug only.
Bộ thay thế dễ dàng lắp đặt cho MC908LJ12CPBE — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MC908LJ12CPBE (cùng hình factor và footprint) — khác nhau ở Package, Supply Voltage, Maximum Clock Frequency, Product Type, ADC.
MC908LJ12CFBE
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Xem tài liệu →MCL908LJ12CPBE
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Xem tài liệu →MC908AP32CFAER
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Xem tài liệu →MC908AP16CFAE
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Xem tài liệu →MC908LJ12CPBE Tỷ lệ tối đa & tính chất điện
| Core Architecture | M68HC08 (CPU08) |
| Bề rộng đường dữ liệu | 8-bit |
| Program Memory Type | FLASH |
| Program Memory Size | 12 KB (12K x 8) |
| RAM Size | up to 768 bytes |
| Tần số xung maksimum | 8 MHz (internal bus) |
| Supply Voltage (VDD) | 3.0 V to 5.5 V |
| Number of I/O Pins | up to 51 GPIO |
| Hộp | 64-LQFP (10x10 mm) |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40 C to +85 C (industrial) |
| LCD Driver | Integrated (HC08LJ family feature) |
| Communication Interfaces | Enhanced SCI (ESCI), SPI |
| On-Chip Debug | Background Debug Mode (BDM) |
| Security Feature | FLASH security lock |
| Low-Voltage Inhibit | On-chip LVI |
| Trạng thái RoHS | Compliant |
Cấu hình chân MC908LJ12CPBE
| Chân 1 | VDD — Positive supply (3.0V-5.5V) |
| Chân 2 | PTA0 — Port A bit 0 (GPIO / IRQ) |
| Chân 3 | PTA1 — Port A bit 1 (GPIO) |
| Chân 4 | PTA2 — Port A bit 2 (GPIO) |
| Chân 5 | PTA3 — Port A bit 3 (GPIO) |
| Chân 6 | PTA4 — Port A bit 4 (GPIO) |
| Chân 7 | PTA5 — Port A bit 5 (GPIO) |
| Chân 8 | PTA6 — Port A bit 6 (GPIO) |
| Chân 9 | PTA7 — Port A bit 7 (GPIO) |
| Chân 10 | VSS — Ground |
| Chân 11 | PTB0 — Port B bit 0 (GPIO) |
| Chân 12 | PTB1 — Port B bit 1 (GPIO) |
| Chân 13 | PTB2 — Port B bit 2 (GPIO) |
| Chân 14 | PTB3 — Port B bit 3 (GPIO) |
| Chân 15 | PTB4 — Port B bit 4 (GPIO) |
| Chân 16 | PTB5 — Port B bit 5 (GPIO) |
| Chân 17 | PTB6 — Port B bit 6 (GPIO) |
| Chân 18 | PTB7 — Port B bit 7 (GPIO) |
| Chân 19 | PTC0 — Port C bit 0 (GPIO) |
| Chân 20 | PTC1 — Port C bit 1 (GPIO) |
| Chân 21 | PTC2 — Port C bit 2 (GPIO) |
| Chân 22 | PTC3 — Port C bit 3 (GPIO) |
| Chân 23 | PTC4 — Port C bit 4 (GPIO) |
| Chân 24 | PTC5 — Port C bit 5 (GPIO) |
| Chân 25 | PTC6 — Port C bit 6 (GPIO) |
| Chân 26 | PTC7 — Port C bit 7 (GPIO) |
| Chân 27 | PTD0 — Port D bit 0 (GPIO) |
| Chân 28 | PTD1 — Port D bit 1 (GPIO) |
| Chân 29 | PTD2 — Port D bit 2 (GPIO) |
| Chân 30 | PTD3 — Port D bit 3 (GPIO) |
| Chân 31 | PTD4 — Port D bit 4 (GPIO) |
| Chân 32 | PTD5 — Port D bit 5 (GPIO) |
| Chân 33 | PTD6 — Port D bit 6 (GPIO) |
| Chân 34 | PTD7 — Port D bit 7 (GPIO) |
| Chân 35 | PTE0 — Port E bit 0 (GPIO) |
| Chân 36 | PTE1 — Port E bit 1 (GPIO) |
| Chân 37 | PTE2 — Port E bit 2 (GPIO) |
| Chân 38 | PTE3 — Port E bit 3 (GPIO) |
| Chân 39 | PTE4 — Port E bit 4 (GPIO) |
| Chân 40 | PTE5 — Port E bit 5 (GPIO) |
| Chân 41 | PTE6 — Port E bit 6 (GPIO) |
| Chân 42 | PTE7 — Port E bit 7 (GPIO) |
| Chân 43 | PTF0 — Port F bit 0 (GPIO) |
| Chân 44 | PTF1 — Port F bit 1 (GPIO) |
| Chân 45 | PTF2 — Port F bit 2 (GPIO) |
| Chân 46 | PTF3 — Port F bit 3 (GPIO) |
| Chân 47 | PTF4 — Port F bit 4 (GPIO) |
| Chân 48 | PTF5 — Port F bit 5 (GPIO) |
| Chân 49 | PTF6 — Port F bit 6 (GPIO) |
| Chân 50 | PTF7 — Port F bit 7 (GPIO) |
| Chân 51 | OSC1 — Oscillator input |
| Chân 52 | OSC2 — Oscillator output |
| Chân 53 | VSS — Ground |
| Chân 54 | BKGD — Background debug mode data |
| Chân 55 | RESET — External reset (active low) |
| Chân 56 | IRQ — External interrupt request |
| Chân 57 | TCLK — Timer clock input |
| Chân 58 | TxD — ESCI transmit data |
| Chân 59 | RxD — ESCI receive data |
| Chân 60 | LCD0 — LCD segment drive 0 |
| Chân 61 | LCD1 — LCD segment drive 1 |
| Chân 62 | LCDBP — LCD backplane drive |
| Chân 63 | VDD — Positive supply (3.0V-5.5V) |
| Chân 64 | VSS — Ground |
Ứng dụng tiêu biểu
MC908LJ12CPBE phù hợp cho 7 Áp dụngs: White-Goods Appliance Control, Industrial HMI / Keypad and LCD Panels, Building Automation Sensor Nodes, Consumer Electronics Controllers, Automotive Body Electronics (Non-Safety), Smart Metering / Utility Endpoints, Educational and Hobbyist Embedded Projects.
White-Goods Appliance Control
The MC908LJ12CPBE fits white-goods appliance controllers - washing machines, dishwashers, microwave ovens - because its 12 KB FLASH holds a typical user-interface and motor-control state machine, the integrated LCD driver directly drives segment displays for time/temperature readouts, and 51 GPIO are ample for keypad scanning plus relay/triac drive. 8 MHz internal bus is sufficient for 50/60 Hz mains-timebase sensing and PWM timer tasks without external oscillators. Operating from 3.0-5.5 V supports both 3.3 V and 5 V designs, and the FLASH security lock protects OEM firmware. The EOL status should be considered: design new appliances on the recommended NXP replacement to avoid lifetime support risk.
Được đề xuất
Industrial HMI / Keypad and LCD Panels
Why the MC908LJ12CPBE fits industrial HMI: 768 bytes of RAM, ESCI for host-side diagnostics, and integrated LCD driver eliminate an external display driver IC. The 51 GPIO support 8x8 key matrix scanning directly without an expander. The 64-LQFP (10x10 mm) package has 0.5 mm pitch compatible with low-cost 4-layer FR-4 PCBs and hand-rework with hot air. BDM mode allows field firmware updates without disassembly, useful for factory-floor equipment with sealed enclosures. Trade-off: 8 MHz clock is the bottleneck for anything beyond simple text rendering on the LCD.
Được đề xuất
Building Automation Sensor Nodes
The MC908LJ12CPBE suits low-cost building-automation sensor nodes - thermostats, CO2 sensors, occupancy detectors - because the HC08 core with 12 KB FLASH runs a simple duty-cycled sensor-fusion stack and the low-voltage inhibit handles brown-out cleanly across long cabling runs. The integrated LCD driver displays room temperature and setpoint without an extra chip. Operating range up to +85 C covers plenum-rated enclosures. Same 64-LQFP footprint across the family lets one PCB be re-flashed with HC08LJ12CFBE for volume production once MC908LJ12CPBE stock is exhausted.
Được đề xuất
Consumer Electronics Controllers
In consumer products such as remote controls, kitchen timers, simple toys, and small audio appliances the MC908LJ12CPBE provides an 8-bit MCU with adequate FLASH (12 KB) for menu-driven user interfaces and the LCD driver for status display, all in one chip. Its 3.0-5.5 V supply covers battery-powered 3 V designs and 5 V USB-powered units. ROM-resident MON08 monitor and BDM both allow OEM programming. The FLASH security lock prevents casual firmware theft. The 8-bit CPU is sufficient when human-perceptible UI delay is acceptable.
Được đề xuất
Automotive Body Electronics (Non-Safety)
Although the MC908LJ12CPBE itself is not AEC-Q100 qualified, it has been used historically in non-safety body electronics: window-lift switches, mirror adjusters, seat-position modules, simple climate-control panels. The 12 KB FLASH holds the calibration tables for 4-channel actuation and the LCD driver shows seat/mirror position. Operating temperature up to +85 C is sufficient for cabin modules. New automotive designs should select AEC-Q100 qualified replacements from the NXP S08/S12 portfolio; the standard MC908LJ12CPBE remains valid for non-automotive or pre-existing automotive platforms with vendor approval.
Được đề xuất
Smart Metering / Utility Endpoints
Within utility metering endpoints such as electricity, gas, and water sub-meters with simple LCD readout, the MC908LJ12CPBE integrates the meter firmware, LCD driver, and tamper-detect GPIO in a single 64-LQFP device. The integrated LVI prevents corruption during brown-out, FLASH security protects metrology IP, and 51 GPIO accept pulse outputs from metering front-ends plus keypad for manual read. EOL status restricts the part to legacy retrofits; new meter designs should move to the recommended NXP replacement listed in the discontinuance notice.
Được đề xuất
Educational and Hobbyist Embedded Projects
The MC908LJ12CPBE and its development ecosystem remain popular in university microcontroller courses and hobbyist projects that teach 8-bit embedded design with on-chip FLASH and an LCD driver. The BDM interface plugs into legacy P&E Multilink pods, and free CodeWarrior HC08 tools still build for it. With 12 KB FLASH, 768-byte RAM, and 51 GPIO, students can implement a complete digital alarm-clock + thermometer project. Use the part for learning; for new commercial designs select a non-EOL replacement.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC908LJ12CPBE — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | MC908LJ12CFBE | MCL908LJ12CPBE | MC908AP32CFAER | MC908AP16CFAE |
|---|---|---|---|---|---|
| Package | 64-LQFP (10x10 mm) | 64-LQFP (FBE suffix) | 64-LQFP (10x10 mm) - same | 64-LQFP (FAE suffix) | 64-LQFP (FAE suffix) |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Program FLASH | 12 KB | 12 KB | 12 KB | 32 KB | 16 KB |
| Core Architecture | HC08 (8-bit) | HC08 (8-bit) | HC08 (8-bit) | HC08 (8-bit) | HC08 (8-bit) |
| Maximum Clock | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 2.7 V to 3.6 V (low-voltage variant) | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| LCD Driver | Integrated (HC08LJ family) | Integrated | Integrated | Not integrated (HC08AP family) | Not integrated (HC08AP family) |
Bảo phân biệt quan trọng
- Integrated LCD driver in a 64-LQFP HC08 part (vsMC908AP32CFAER (HC08AP family))
- Smaller FLASH footprint fits cost-sensitive designs (vsMC908AP32CFAER (32 KB FLASH))
- Tighter low-voltage variant available (vsStandard HC08LJ12 (3.0-5.5 V only))
Ghi chú thiết kế
Estimated: total quiescent current in STOP mode is in the single-digit microamp range from the HC08 family datasheet; actual figure requires the orderable part number's electrical characteristics table. Place a 100 nF ceramic decoupling capacitor within 5 mm of every VDD pin and a single 4.7 uF bulk tantalum or aluminum-polymer capacitor on the main supply rail. The on-chip Low-Voltage Inhibit (LVI) holds the CPU in reset if VDD droops below threshold during brown-out, preventing FLASH corruption.
Route the OSC1/OSC2 traces as short as possible and keep the crystal within 5 mm of the pins with a guard ground ring to reduce EMI susceptibility. Place BKGD near a 2-pin or 4-pin header to support in-system BDM programming without rework. Keep the reset line short with a 100 ns rise time and add a 10 kohm pull-up plus a 100 nF cap for debounce.
Do not exceed VDD of 5.5 V; over-voltage stresses the FLASH charge pump. Do not enable FLASH security unless the firmware is fully validated - a locked part cannot be re-programmed without external intervention and the security bit setting is irreversible in most HC08 derivatives. Use BDM mode rather than monitor mode for production programming to save 1 KB of FLASH that the monitor otherwise consumes.
Thông tin tuân thủ
RoHS and REACH compliance per NXP product page. Part is not AEC-Q100 qualified - do not use for automotive safety applications. Conflict-minerals declaration on NXP corporate compliance page.