NXP Semiconductors MC908AP64ACFAE

Overview

MC908AP64ACFAE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller featuring 64 KB on-chip Flash memory, 2 KB RAM, and a 20 MHz CPU clock. It integrates a 16-channel 10-bit ADC, SCI, SPI, I²C, PWM timers, and low-power stop/wait modes. Designed for cost-sensitive industrial control and appliance applications requiring deterministic real-time response and flash reprogrammability.

For engineers reviewing the MC908AP64ACFAE datasheet, MC908AP64ACFAE pinout, MC908AP64ACFAE application, or MC908AP64ACFAE equivalent, this page delivers verified electrical specs, validated package mapping, confirmed peripheral register behavior, and field-tested alternative selection guidance - all grounded in Rev. 3 (Oct 2007) official documentation and Digi-Key/Mouser parametric data.

Technical Context

The MC908AP64ACFAE implements the HCS08 core with enhanced addressing modes and a 16-bit index register. Its Clock Generator Module (CGM) supports internal RC oscillator, external crystal (1–8 MHz), and PLL-based frequency multiplication up to 20 MHz bus speed. The System Integration Module (SIM) provides centralized reset management, interrupt prioritization, and low-power mode coordination across peripherals.

Peripheral integration includes a 16-channel 10-bit ADC with programmable sample time and conversion trigger sources; dual 16-bit TIM modules supporting input capture, output compare, and buffered/unbuffered PWM; and full-duplex SCI with break detection and LIN-compatible framing. All modules are memory-mapped and accessible via standard HCS08 instruction set.

Key Specifications

Pinout & Package

MC908AP64ACFAE is housed in a 64-pin LQFP (10 mm × 10 mm, 0.5 mm pitch) package with exposed thermal pad. Pin assignments follow the MC68HC908AP A-Family Data Sheet Rev. 3 Figure 1-4 (Pin Assignment) and Table 1-2 (Pin Functions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908AP32ACFAE, the MC908AP64ACFAE provides double Flash capacity for complex control logic and data logging, while S9KEAZN64AMLH offers modern ARM performance and peripherals at the cost of increased design complexity and ecosystem transition effort.

Availability

MC908AP64ACFAE is available at Aetrix Electronics and suitable for industrial motor control, home appliance UI, and smart power metering requiring stable component supply and long-term production continuity.

Supply support for MC908AP64ACFAE 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 markets, with roots in Freescale's legacy MCU portfolio.

The MC908AP64ACFAE belongs to the HCS08 family - engineered for cost-effective, low-power embedded control in appliances, industrial equipment, and metering where deterministic real-time response and field-upgradable firmware are essential.

FAQ

What is the maximum operating frequency of the MC908AP64ACFAE CPU core?

The MC908AP64ACFAE CPU core runs at a maximum bus frequency of 20 MHz, achieved via its integrated Clock Generator Module (CGM) PLL using a 1–8 MHz crystal input. This yields a 50 ns instruction cycle time for deterministic real-time execution. The MC908AP64ACFAE datasheet Rev. 3 specifies this limit under DC characteristics (Section 22.5), and it is enforced by the CGM's VCO range and PLL multiplier settings.

Does the MC908AP64ACFAE support in-system programming (ISP) without external hardware?

Yes, the MC908AP64ACFAE supports ISP via its ROM-resident Monitor Mode (MON), accessible through the SCI interface using standard UART signals. No external programmer is needed - firmware updates can be performed in the field using a simple terminal or custom host application. This capability is documented in Chapter 8 of the MC908AP64ACFAE datasheet Rev. 3 and validated in production deployments for appliance firmware patches.

How many ADC channels does the MC908AP64ACFAE provide, and what is their resolution?

The MC908AP64ACFAE integrates a single 10-bit successive-approximation ADC with 16 selectable input channels (including internal temperature sensor and bandgap reference). It achieves ±1 LSB integral nonlinearity over the full −40°C to +85°C range, as specified in Section 22.3 of the MC908AP64ACFAE datasheet Rev. 3. Channel selection and conversion triggering are fully software-configurable via ADCSC1 and ADCSC2 registers.

What low-power modes are available on the MC908AP64ACFAE, and what is the typical current draw in stop mode?

The MC908AP64ACFAE supports Wait and Stop low-power modes. In Stop mode, with all clocks disabled except the LVI and COP modules, typical current consumption is 0.5 µA at 3.0 V and 25°C (Section 22.5, Rev. 3). This enables multi-year battery operation in metering and sensor nodes. Wake-up is possible via RESET, IRQ, KBI, or COP timeout - all retaining RAM contents and register states.

Is the MC908AP64ACFAE pin-compatible with other members of the AP-family, such as MC908AP32ACFAE?

Yes, the MC908AP64ACFAE is fully pin-compatible with MC908AP32ACFAE, MC908AP16ACFAE, and MC908AP8ACFAE in the 64-pin LQFP package. They share identical pin functions, electrical characteristics, and peripheral mappings - differing only in Flash size (64/32/16/8 KB) and associated mask options. This allows scalable design reuse and simplified BOM management across product tiers.