NXP Semiconductors MC908AP64CFAE

Overview

MC908AP64CFAE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller featuring 64 KB on-chip Flash memory, 2 KB RAM, and integrated peripherals including SCI, SPI, I²C, ADC (8-channel, 10-bit), TIM, TBM, and CGM with PLL-based clock generation. It operates at up to 20 MHz bus frequency, supports 5 V operation, and targets embedded control in industrial sensors, motor drives, and appliance subsystems.

For engineers reviewing the MC908AP64CFAE datasheet, MC908AP64CFAE pinout, MC908AP64CFAE application, or MC908AP64CFAE equivalent, this page delivers verified electrical specs, package mapping (LQFP-64), functional pin roles, real-world use cases in closed-loop control and serial interface bridging, and two validated alternative parts with documented differences in Flash size and oscillator architecture.

Technical Context

The MC908AP64CFAE implements the HCS08 CPU core with enhanced addressing modes and a 16-bit index register, executing instructions at up to 20 MHz via its Clock Generator Module (CGM) - which includes a PLL capable of multiplying internal RC or external crystal reference clocks. Its System Integration Module (SIM) manages reset sources (POR, LVI, COP), interrupt prioritization across 32 vectors, and low-power Wait/Stop modes with wake-up on IRQ or KBI.

Peripheral integration includes a 10-bit ADC with programmable sample time and conversion trigger sources (TIM overflow, software, external pin), dual asynchronous SCI modules supporting full-duplex UART communication, and a Timer Interface Module (TIM) with four input-capture/output-compare channels and PWM generation capability. All modules are memory-mapped and accessible via standard I/O registers.

Key Specifications

Pinout & Package

LQFP-64 (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad; RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908AP32CFAE, the MC908AP64CFAE provides double Flash capacity for complex control logic and bootloader coexistence; versus MC9S08AW60CFUE, it offers pin-compatible 5 V operation and lower BOM cost but lacks 12-bit ADC and CAN interface - making it optimal for established 5 V industrial platforms requiring proven reliability over new feature sets.

Availability

MC908AP64CFAE is available at Aetrix Electronics and suitable for industrial motor control, smart appliance subsystems, and legacy protocol converter designs requiring stable component supply, long-term lifecycle support, and consistent 5 V operation.

Supply support for MC908AP64CFAE 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

Freescale Semiconductor (now part of NXP Semiconductors) is a global leader in embedded processing, delivering scalable MCU, MPU, and analog solutions for automotive, industrial, and consumer markets.

The MC908AP64CFAE belongs to the HCS08 family - designed specifically for cost-effective, 5 V-based industrial control applications where robustness, Flash endurance, and peripheral integration outweigh raw performance demands.

FAQ

What is the maximum operating frequency of the MC908AP64CFAE?

The MC908AP64CFAE achieves a maximum bus frequency of 20 MHz, derived from its internal Clock Generator Module (CGM) with PLL. This frequency is sustained across the full 4.5–5.5 V supply range and ambient temperatures from –40°C to +85°C, as validated in Freescale's DC and AC electrical specifications. The MC908AP64CFAE does not require external clock circuitry to reach this speed when using the internal RC oscillator or a 4 MHz crystal.

Does the MC908AP64CFAE support in-system programming (ISP)?

Yes, the MC908AP64CFAE includes a 256-byte Monitor ROM that enables in-system programming via its SCI1 interface without external hardware programmers. Using standard UART commands, users can erase, program, and verify Flash memory blocks directly in the target application. This capability is fully implemented in the MC908AP64CFAE and documented in Chapter 8 of the Rev. 3 datasheet.

What are the key differences between MC908AP64CFAE and MC908AP32CFAE?

The MC908AP64CFAE and MC908AP32CFAE share identical peripherals, pinout, and register mapping, differing only in Flash capacity (64 KB vs. 32 KB) and associated mask options. Both operate at 20 MHz, support the same 5 V supply, and use the LQFP-64 package. The MC908AP64CFAE is backward-compatible with MC908AP32CFAE designs when Flash usage remains under 32 KB.

Is the MC908AP64CFAE qualified for industrial temperature range?

Yes, the MC908AP64CFAE is specified for operation from –40°C to +85°C, meeting industrial-grade environmental requirements. Its electrical characteristics - including ADC linearity, PLL lock time, and I/O drive strength - are guaranteed across this full range, as confirmed in Section 22.5 (DC Electrical Characteristics) and Section 22.6 (AC Electrical Characteristics) of the MC68HC908AP A-Family Data Sheet, Rev. 3.

Can the MC908AP64CFAE generate PWM signals with dead-time insertion?

No, the MC908AP64CFAE's Timer Interface Module (TIM) supports standard PWM output compare but does not include hardware dead-time insertion logic. Dead-time must be implemented in firmware using complementary channel toggling with software-controlled delays. This limitation is inherent to the TIM architecture described in Chapter 9 of the datasheet and applies to all members of the AP-family, including the MC908AP64CFAE.