NXP Semiconductors MC908GP32CPE

Overview

MC908GP32CPE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller with 32 KB on-chip Flash memory, 1 KB RAM, and integrated peripherals including ADC, SCI, SPI, TIM, KBI, and CGM with PLL. It operates at up to 8 MHz bus frequency, supports low-power Wait/Stop modes, and targets embedded control in industrial sensors, motor controllers, and appliance subsystems.

For engineers reviewing the MC908GP32CPE datasheet, MC908GP32CPE pinout, MC908GP32CPE application, or MC908GP32CPE equivalent, key selection criteria include its 44-pin PDIP package, 8-channel 10-bit ADC, single-slope ADC conversion time of 25 µs (typ), CGM PLL lock time ≤10 ms, and COP watchdog timer with selectable timeout intervals.

Technical Context

The MC908GP32CPE implements the HCS08 CPU core with 16-bit address space, supporting indexed, extended, and relative addressing. Its Clock Generator Module integrates a crystal oscillator, PLL with programmable multiplier (×1 to ×32), and base clock selector for flexible system timing.

The device features two independent timer modules (TIM1/TIM2) with input capture, output compare, and PWM generation capability, plus a dedicated Timebase Module (TBM) for real-time interrupt generation. All peripherals are memory-mapped and controlled via dedicated I/O registers accessible in user mode.

Key Specifications

Pinout & Package

MC908GP32CPE is housed in a 44-pin Plastic Dual In-line Package (PDIP) with 0.9-inch body width and 0.1-inch lead pitch, compliant with JEDEC MS-001. Pin functions are defined per datasheet Rev. 10 Section 1.4 and 1.5.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908GP32CPE, MC908AP64CFUE offers double Flash/RAM for advanced firmware but demands layout change, while MC9S08QG8CDTE retains identical packaging and basic functionality at lower memory density and no PLL-making it a footprint-compatible upgrade path only for minimal-feature applications.

Availability

MC908GP32CPE is available at Aetrix Electronics and suitable for industrial sensor nodes, appliance motor controllers, smart power outlets, and building automation controllers requiring stable component supply and long-term manufacturability.

Supply support for MC908GP32CPE 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) designed high-reliability, mixed-signal microcontrollers for automotive, industrial, and consumer applications.

The MC908GP32CPE belongs to the HCS08 family, engineered for cost-effective, low-power embedded control in resource-constrained systems with integrated analog and communication peripherals.

FAQ

What is the maximum operating frequency of the MC908GP32CPE?

The MC908GP32CPE achieves a maximum bus frequency of 8 MHz, derived from its internal PLL which multiplies an external crystal input (1–8 MHz) by factors from ×1 to ×32. The actual achievable frequency depends on the crystal source and PLL configuration register settings. For example, a 4 MHz crystal with ×2 PLL yields 8 MHz bus clock. This value is confirmed in Section 5.3.2 and Table 19-1 of the Rev. 10 datasheet.

Does the MC908GP32CPE support in-system programming (ISP)?

Yes, the MC908GP32CPE supports in-system programming via its on-chip Flash memory using Freescale's standard background debug mode (BDM) interface. Programming requires only a 5 V supply-no external high-voltage VPP-and leverages SuperFlash® technology for fast erase/program cycles. This capability is documented in Section 2.6 and Chapter 18 of the MC908GP32CPE datasheet Rev. 10.

What ADC resolution and conversion time does the MC908GP32CPE provide?

The MC908GP32CPE integrates a 10-bit successive-approximation ADC with 8 input channels (AD0–AD7). Its typical conversion time is 25 µs at 8 MHz bus clock, corresponding to 200 bus cycles. Accuracy is specified as ±2 LSB integral nonlinearity and ±1.5 LSB differential nonlinearity over temperature. These values are detailed in Sections 4.3.3 and 4.3.5 of the MC908GP32CPE datasheet Rev. 10.

How does the COP watchdog timer function on the MC908GP32CPE?

The MC908GP32CPE includes a Computer Operating Properly (COP) module that generates a system reset if not serviced within a programmable timeout window. Timeout intervals range from 32 ms to 2.1 s, selected via the COPRS bits in the COPCTL register. The COP must be cleared by writing 0x55 followed by 0xAA to the COPCTL register before timeout; failure triggers hardware reset. This behavior is fully described in Chapter 7 of the MC908GP32CPE datasheet Rev. 10.

Is the MC908GP32CPE pin-compatible with other HCS08 devices in PDIP-44 package?

No, the MC908GP32CPE is not universally pin-compatible with other HCS08 devices in 44-pin PDIP. While some variants like MC908AP64 share the same pin count, their peripheral mappings differ-for example, AP64 assigns PTC5/PTC6 to SPI signals, whereas MC908GP32CPE uses those pins as general I/O. Pin assignments are device-specific and defined in Section 1.4 of the MC908GP32CPE datasheet Rev. 10.