NXP Semiconductors MC9S08GT8AMFDE

Overview

MC9S08GT8AMFDE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller with 8 KB flash, 512 B RAM, and a 40-MHz CPU core. It integrates dual SCI, SPI, I²C, 10-bit ATD, two TPM modules (3+2 channels), KBI, and low-voltage detection. Designed for cost-sensitive industrial control and sensor interface applications requiring compact QFN-32 packaging and single-wire background debug.

For engineers reviewing the MC9S08GT8AMFDE datasheet, MC9S08GT8AMFDE pinout, MC9S08GT8AMFDE application, or MC9S08GT8AMFDE equivalent, key selection criteria include flash size vs. code footprint, QFN-32 thermal performance in space-constrained PCBs, real-time interrupt capability during stop modes, and compatibility with legacy HCS08 toolchains and BDM debug interfaces.

Technical Context

The MC9S08GT8AMFDE implements the HCS08 CPU core with HC08 instruction set extension (including BGND), supporting up to 32 interrupt/reset sources and three very low-power stop modes. Its internal clock generator includes FLL with selectable reference sources (internal RC, external crystal/resonator, or external clock), ±0.5% frequency deviation over voltage/temperature, and programmable trimming resolution of ±0.2%.

Peripherals are partitioned across six I/O ports: Port A supports keyboard interrupt inputs; Port B provides ATD analog inputs; Ports C–E host SCI1/SCI2, SPI, I²C, TPM1/TPM2, and high-current outputs; Port G handles BKGD/MS and oscillator signals. All I/O pins support software-selectable pullups and slew-rate control.

Key Specifications

Pinout & Package

MC9S08GT8AMFDE is housed in a 32-pin QFN package (98ASA00473D) with exposed thermal pad, copper-wire bonding, and 0.5 mm pitch. The package supports reflow soldering per JEDEC J-STD-020 and requires controlled thermal relief for the exposed pad per EB806 guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08GT8AMFDE, MC9S08GT16AMFDE offers double flash capacity with no change to peripherals or power profile, while S9KEAZ128AMLH delivers 32-bit compute headroom and modern toolchain support at the cost of increased static current and code migration effort.

Availability

MC9S08GT8AMFDE is available at Aetrix Electronics and suitable for industrial sensor nodes, smart HVAC actuators, PLC I/O modules, and medical infusion pump controllers requiring stable component supply and long-term lifecycle assurance.

Supply support for MC9S08GT8AMFDE 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 embedded microcontroller heritage.

The MC9S08GT8AMFDE belongs to the HCS08 family - a line of cost-optimized 8-bit MCUs designed for resource-constrained industrial control, appliance, and sensor interface applications where deterministic real-time response and ultra-low-power operation are critical.

FAQ

What is the maximum operating frequency of the MC9S08GT8AMFDE CPU core?

The MC9S08GT8AMFDE features an HCS08 CPU core with a maximum bus frequency of 40 MHz. This is achieved using the internal frequency-locked loop (FLL) driven by internal RC, external crystal, or external clock sources. The actual core instruction throughput depends on bus frequency and instruction cycle count, with most instructions executing in 1–3 bus cycles.

Does the MC9S08GT8AMFDE support in-circuit debugging, and what interface is used?

Yes, the MC9S08GT8AMFDE supports in-circuit debugging via a single-wire background debug (BDM) interface on the PTG0/BKGD/MS pin. This interface enables breakpoint setting, real-time bus capture, and on-chip emulation through an integrated ICE module with two comparators and nine trigger modes, all without requiring additional debug pins.

What are the power-saving modes supported by the MC9S08GT8AMFDE, and how do they differ?

The MC9S08GT8AMFDE supports Run, Wait, and three Stop modes (Stop1, Stop2, Stop3). Stop1 disables the FLL but retains RAM and register contents; Stop2 powers down the FLL and most clocks while preserving RAM; Stop3 shuts down all clocks including RTI, offering lowest current draw. All Stop modes support wake-up via RTI, IRQ, or KBI events.

Can the MC9S08GT8AMFDE operate without an external crystal, and what accuracy does the internal clock provide?

Yes, the MC9S08GT8AMFDE can operate using its internal trimmed RC oscillator without any external crystal. The internal clock generator supports ±0.5% frequency deviation across voltage and temperature ranges, with ±0.2% trimming resolution via the ICGTRM register - sufficient for UART communication and non-critical timing functions.

How many analog-to-digital converter (ATD) channels does the MC9S08GT8AMFDE include, and what is their resolution?

The MC9S08GT8AMFDE includes an 8-channel, 10-bit analog-to-digital converter (ATD) with dedicated VREFH and VREFL inputs. Each channel supports programmable sample time and conversion trigger sources (software, TPM, or RTI), delivering 10-bit resolution (0–1023) over a user-defined reference voltage range for precise sensor signal acquisition.