NXP Semiconductors MC908AB32CFUER

Overview

MC908AB32CFUER from NXP (formerly Freescale) is an 8-bit HCS08-core microcontroller with 32 KB on-chip FLASH, 1 KB RAM, and 512 B EEPROM. It integrates dual 16-bit timer modules (TIMA/TIMB), a 10-bit 8-channel ADC, SCI and SPI serial interfaces, and a PLL-based clock generator. It targets embedded control in industrial sensors and motor drive feedback systems.

For engineers reviewing the MC908AB32CFUER datasheet, MC908AB32CFUER pinout, MC908AB32CFUER application, or MC908AB32CFUER equivalent, key selection criteria include its 32 KB FLASH endurance (10K erase/write cycles), 10-bit ADC ±2 LSB INL, dual buffered PWM capability, COP watchdog, and LVI reset threshold at 2.7 V - all validated for operation across –40°C to +85°C.

Technical Context

The MC908AB32CFUER implements the HCS08 CPU core with 16-bit address space, supporting indexed, extended, and relative addressing modes. Its System Integration Module (SIM) manages reset sources including POR, LVI, COP timeout, and illegal opcode detection - all mapped to dedicated status flags in SIMRS.

The Clock Generator Module (CGM) includes a crystal oscillator input (OSC1/OSC2), PLL with programmable bandwidth, and CGMOUT base clock output. The PLL supports acquisition lock times under 10 ms with external CGMXFC filter capacitor and enables CPU frequencies up to 20 MHz from a 32.768 kHz crystal.

Key Specifications

Pinout & Package

MC908AB32CFUER is housed in a 64-pin QFP (Quad Flat Package) with 0.5 mm pitch, JEDEC MS-026 compliant. Package dimensions: 10.0 × 10.0 × 1.4 mm, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08AW32CFUE and S9KEAZN32ACLH, the MC908AB32CFUER delivers deterministic real-time response with minimal memory overhead, retains MON-based ISP capability absent in Kinetis, and avoids CAN licensing complexity - making it ideal for fixed-function industrial controllers where feature creep must be avoided.

Availability

MC908AB32CFUER is available at Aetrix Electronics and suitable for industrial sensor nodes, BLDC motor controllers, smart power meter interfaces, and factory automation I/O modules requiring stable component supply and long-term lifecycle support.

Supply support for MC908AB32CFUER 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 is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Freescale's microcontroller heritage.

The MC908AB32CFUER belongs to the HCS08 family, designed specifically for cost-sensitive, low-power embedded control applications demanding high reliability, integrated analog peripherals, and robust in-field firmware update capability via Monitor ROM.

FAQ

What is the maximum operating frequency of the MC908AB32CFUER?

The MC908AB32CFUER supports a maximum CPU bus frequency of 20 MHz, achieved via its integrated PLL clock generator. When driven by a 32.768 kHz crystal, the PLL multiplies the input to generate CGMOUT at 20 MHz. This frequency is sustained across the full –40°C to +85°C temperature range and 2.7–5.5 V supply, as verified in Section 9.10 of the official datasheet.

Does the MC908AB32CFUER include a hardware bootloader?

Yes, the MC908AB32CFUER includes a 1 KB Monitor ROM (MON) that provides a factory-programmed in-system programming (ISP) interface. This allows firmware updates over the SCI interface without requiring an external programmer. The MON supports ASCII command protocol, echo control, and baud rate auto-detection - fully documented in Section 10 of the MC68HC908AB32 technical data.

How many ADC channels does the MC908AB32CFUER support, and what is its resolution?

The MC908AB32CFUER integrates a 10-bit successive-approximation ADC with 8 input channels (ATD0–ATD7), mapped to PTB0–PTB7. Its typical integral nonlinearity is ±2 LSB, and conversion time is 16 µs per sample at 2 MHz ADCLK. Reference voltage is selectable between internal bandgap and external VREFH, as specified in Section 14.4.5 of the datasheet.

Can the MC908AB32CFUER operate in low-power modes, and which peripherals remain active?

Yes, the MC908AB32CFUER supports Wait and Stop low-power modes. In Wait mode, the CPU halts while peripherals (ADC, TIMA/TIMB, SCI, SPI) continue operation. In Stop mode, all clocks are gated except for the LVI and COP modules; RAM contents are retained, and wake-up is supported via IRQ, KBI, or SCI idle-line detection - detailed in Sections 7.6, 8.7, and 15.6.

What packaging and compliance certifications apply to the MC908AB32CFUER?

The MC908AB32CFUER is supplied in a 64-pin QFP package (JEDEC MS-026, 10 mm × 10 mm, 0.5 mm pitch), lead-free and RoHS-compliant. It is not AEC-Q100 qualified. The device meets industrial temperature grading (–40°C to +85°C) and is rated for 1000-cycle reflow per J-STD-020. Full mechanical specifications appear in Section 24 of the MC68HC908AB32 datasheet.