NXP Semiconductors MCHC908LK24CFQE

Overview

MCHC908LK24CFQE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 core microcontroller with 24 KB on-chip Flash, 1 KB RAM, and integrated LCD driver, RTC, IRSCI, SPI, I²C, and 10-bit ADC - designed for low-power embedded control in portable instrumentation and industrial HMI panels.

For engineers reviewing the MCHC908LK24CFQE datasheet, MCHC908LK24CFQE pinout, MCHC908LK24CFQE application, or MCHC908LK24CFQE equivalent, key selection criteria include its 24 KB SuperFlash® endurance (100k erase/write cycles), 3.3 V operation with 1.8–5.5 V supply range, and support for both crystal and internal RC oscillator modes with PLL-based clock multiplication up to 8 MHz.

Technical Context

The MCHC908LK24CFQE implements the HCS08 CPU core with 16-bit address space, supporting wait/stop low-power modes and COP watchdog. Its Clock Generator Module (CGM) integrates a PLL with programmable reference divider and VCO range select, enabling stable system clocks from low-frequency crystals or internal RC sources.

System integration includes a System Integration Module (SIM) managing reset sources (POR, LVI, COP, illegal opcode), interrupt prioritization across 16 vectors, and bus timing control. The Real-Time Clock (RTC) provides calendar, alarm, chronograph, and timebase interrupt functions with independent 32.768 kHz crystal input and calibration register support.

Key Specifications

Pinout & Package

Package: 80-pin Quad Flat Package (QFP), 14 mm × 14 mm body, 0.65 mm lead pitch, exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with MC9S08LG32CFUE, MCHC908LK24CFQE offers smaller Flash footprint and proven RTC/LCD integration at lower unit cost; versus MC9RS08LA8CP, it delivers full feature set for complex time-aware displays but requires larger board area and higher design effort.

Availability

MCHC908LK24CFQE is available at Aetrix Electronics and suitable for portable medical devices, industrial HMI panels, smart energy meters, and home appliance user interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for MCHC908LK24CFQE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors acquired Freescale in 2015 and maintains full technical and supply chain continuity for the HCS08 microcontroller family.

The MCHC908LK24CFQE belongs to the HCS08 MCU product line, engineered for cost-sensitive, low-power embedded systems requiring integrated peripherals - especially LCD-driven human-machine interfaces with real-time awareness.

FAQ

What is the maximum operating frequency of the MCHC908LK24CFQE?

The MCHC908LK24CFQE supports a maximum bus frequency of 20 MHz, achieved by configuring the internal PLL to multiply a 1–8 MHz crystal or internal RC source. At default configuration with 4 MHz crystal input and ×2 PLL multiplier, the core runs at 8 MHz with 20 MHz bus speed. All timing specifications in the datasheet assume this relationship between core and bus clocks.

Does the MCHC908LK24CFQE support in-system programming (ISP)?

Yes, the MCHC908LK24CFQE supports in-system programming via its Monitor ROM (MON) using the IRSCI or SCI interface. The MON provides bootloader routines (PRGRNGE, ERARNGE, LDRNGE) that allow Flash erasure, page programming, and data loading without external programming hardware - essential for field firmware updates and production line programming.

How does the RTC in the MCHC908LK24CFQE maintain accuracy across temperature variations?

The MCHC908LK24CFQE RTC includes a calibration register (RTCCOMR) and data register (RTCCDAT) allowing ±127 ppm fine-tuning of the 32.768 kHz crystal oscillator. Calibration values can be written during production test to compensate for crystal aging and temperature drift, achieving typical accuracy of ±1 minute per month over –40°C to +85°C when properly calibrated.

Can the MCHC908LK24CFQE drive a 4×32 segment LCD without external components?

Yes, the MCHC908LK24CFQE integrates a full LCD controller capable of driving up to 128 segments (e.g., 4 backplanes × 32 frontplanes) using internal charge pump and VLCD bias generation. No external resistors, capacitors, or driver ICs are required for standard static or 1/2–1/4 duty dynamic LCDs operating within its voltage and frequency limits.

What low-power modes are supported by the MCHC908LK24CFQE, and which peripherals remain active in each?

The MCHC908LK24CFQE supports Wait and Stop modes. In Wait mode, the CPU halts while peripherals (RTC, ADC, TIM, IRSCI) continue operating with reduced current draw (~50 µA typical). In Stop mode, all clocks halt except the RTC oscillator; only RTC, LVI, and external IRQ can wake the device, achieving ~1 µA standby current with RTC running.