NXP Semiconductors MC9S08GT32CFBE

Overview

MC9S08GT32CFBE from Freescale Semiconductor is an 8-bit HCS08 microcontroller with 32 KB Flash, 2 KB RAM, and integrated peripherals including SCI, SPI, IIC, TPM, ATD, and KBI. It operates at up to 40 MHz bus frequency in FEE mode and targets low-power embedded control in automotive body electronics and industrial sensors.

For engineers reviewing the MC9S08GT32CFBE datasheet, MC9S08GT32CFBE pinout, MC9S08GT32CFBE application, or MC9S08GT32CFBE equivalent, key selection criteria include its 48-pin LQFP package, internal clock generator (FBE/FEE/FEI modes), 10-bit ATD with 8 channels, and background debug interface support for in-circuit development.

Technical Context

The MC9S08GT32CFBE implements the HCS08 CPU core with 16-bit index register, 8-bit accumulator, and condition code register. Its Internal Clock Generator supports multiple modes: FBE (FLL Bypassed, External clock), FEI (FLL Engaged, Internal), and FEE (FLL Engaged, External), enabling flexible clock source selection from crystal, ceramic resonator, or external oscillator.

Peripherals include two serial interfaces (SCI1 and SCI2), one SPI module, one IIC module, two 16-bit Timer/PWM modules (TPM1 and TPM2) with up to six channels total, a 10-bit Analog-to-Digital Converter with 8 input channels and hardware trigger capability, and Keyboard Interrupt (KBI) on Port A pins - all mapped to dedicated I/O ports with configurable pullups and slew rate control.

Key Specifications

Pinout & Package

MC9S08GT32CFBE is housed in a 48-pin LQFP (7 mm × 7 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined per port mapping in the MC9S08GB/GT datasheet Rev. 2.3, Section 2.2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with MC9S08GT32CFBE, MC9S08AC60CFUE offers greater memory headroom at the cost of larger package and no KBI, while S9S08SG48F1MLC delivers modern toolchain support and LIN capability in identical footprint - both require firmware adaptation but avoid architectural redesign.

Availability

MC9S08GT32CFBE is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, smart appliance UIs, and portable medical diagnostic tools requiring stable component supply across long production lifecycles.

Supply support for MC9S08GT32CFBE 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 was a U.S.-based semiconductor company specializing in embedded processors, analog, and connectivity solutions before its acquisition by NXP Semiconductors in 2015.

The MC9S08GT32CFBE belongs to the HCS08 GB/GT microcontroller family, designed for cost-sensitive, low-power 8-bit control applications in automotive, industrial, and consumer systems where Flash density, peripheral integration, and debug flexibility are critical.

FAQ

What is the maximum operating frequency of the MC9S08GT32CFBE?

The MC9S08GT32CFBE supports a maximum bus frequency of 40 MHz, achievable in FEE (FLL Engaged, External) mode using an 8 MHz crystal with ×5 multiplication. Core instruction execution remains cycle-accurate at this rate, with most instructions completing in 1–5 bus cycles. The MC9S08GT32CFBE does not support overclocking beyond this specification, and sustained operation above 40 MHz violates electrical limits defined in Appendix A of the datasheet Rev. 2.3.

Does the MC9S08GT32CFBE include hardware debug support?

Yes, the MC9S08GT32CFBE integrates a single-wire Background Debug Mode (BDM) interface accessible via the PTG0 pin. This allows full in-circuit debugging, flash programming, register inspection, and breakpoint setting without requiring additional JTAG hardware. The MC9S08GT32CFBE BDM implementation complies with Freescale's standard protocol and is supported by CodeWarrior Development Studio v5.1+ and compatible third-party debug probes.

Can the MC9S08GT32CFBE operate from a 3.3 V supply?

Yes, the MC9S08GT32CFBE operates across a supply voltage range of 2.7 V to 5.5 V, making it fully compatible with 3.3 V systems. All I/O pins are 5 V tolerant when configured as inputs, and internal peripherals-including the ATD, TPM, and SCI-function correctly at 3.3 V. The MC9S08GT32CFBE's LVD module can be configured to monitor VDD and assert reset or interrupt at 3.1 V, ensuring reliable operation during 3.3 V rail droop.

How many analog input channels does the ATD module in the MC9S08GT32CFBE support?

The MC9S08GT32CFBE includes a 10-bit Analog-to-Digital Converter (ATD) module with eight dedicated analog input channels, mapped directly to PTB0–PTB7. These pins can be dynamically reconfigured as digital I/O when ATD is disabled. The ATD supports software or hardware (TPM/RTI) trigger sources, 8-channel scan mode, and configurable sample-and-hold time - all documented in Chapter 14 of the MC9S08GB/GT Data Sheet Rev. 2.3.

Is the MC9S08GT32CFBE pin-compatible with other devices in the HCS08 GB/GT family?

The MC9S08GT32CFBE shares the same 48-pin LQFP package and pinout with MC9S08GT16CFBE and MC9S08GT60CFBE, enabling direct PCB reuse across memory variants. However, it is not pin-compatible with 64-pin variants (e.g., MC9S08AC60CFUE) or devices with different peripheral sets (e.g., MC9S08GB60). The MC9S08GT32CFBE pin mapping matches Table 2-2 in the datasheet Rev. 2.3, confirming identical signal placement for all 48 terminals.