MC9S08GB32CFUE - S08 8-Bit MCU, 32KB Flash, 40MHz | NXP
MPN: MC9S08GB32CFUE ⚠ Last Time Buy| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.42 | $8.42 |
| 10 | $7.58 | $75.80 |
| 100 | $6.74 | $674.00 |
| 500 | $6.05 | $3,025.00 |
| 1,000 | $5.41 | $5,410.00 |
MC9S08GB32CFUE Overview
What is an 8-bit microcontroller? An 8-bit microcontroller is a single-chip computer that processes data in 8-bit-wide chunks through a central processing unit, with embedded Flash for program storage, RAM for runtime variables, and integrated peripherals such as timers, communication controllers, and analog-to-digital converters. MCUs sit inside the broader semiconductor taxonomy as integrated circuits, sub-categorized as microcontrollers (MCUs), and further specified by core architecture (S08), memory size, and package. The S08 core is NXP's proprietary 8-bit instruction set architecture derived from the original Freescale HC08 and HCS08 lineages, optimized for low power and deterministic interrupt response in industrial control applications.
Key features of the MC9S08GB32CFUE include 32 KB of on-chip Flash memory organized as 32K x 8, 2 KB of SRAM, up to 56 user I/O pins, a 40 MHz maximum CPU bus frequency, an integrated analog-to-digital converter, multiple serial communication interfaces (SCI/UART, SPI, I2C), a programmable 16-bit timer module, and a low-power stop mode with selective peripheral clock gating. The 64-LQFP package provides ample pin count for external bus and analog signal routing.
Architecturally, the S08GB32 uses the HCS08 CPU core with a 3-stage pipeline and a background debug mode (BDM) interface for non-intrusive in-circuit programming and debugging. The Flash memory supports in-application reprogramming with built-in security features, while the internal clock module can operate from an external crystal or an internal reference oscillator.
Typical applications for this device include industrial control panels, building automation sensor nodes, white-goods motor controllers, USB-to-UART bridges, and general-purpose embedded control boards. The wide temperature range and robust peripheral set also suit automotive body electronics and consumer appliance controllers.
When designing with the MC9S08GB32CFUE, ensure your toolchain supports the HCS08 instruction set (CodeWarrior for S08 or GCC for S08), provide decoupling capacitors adjacent to each VDD/VSS pair, and verify that BDM debugging header access is preserved on the production PCB. Watch the absolute maximum supply voltage (5 V typical, with absolute maximum per datasheet).
This page synthesizes distributor stock, drop-in compatible S08 family alternatives, and practical S08GB PCB design notes not found in the standalone manufacturer datasheet.
Drop-in alternatives for MC9S08GB32CFUE — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MC9S08GB32CFUE (same form factor and footprint) — differing in Program Memory Size, RAM Size, Package, Communication Interfaces, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S08GB60ACFUE
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Contact for price
View Datasheet →MC9S08GB32CFUER
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC9S08GB32CFUE Maximum Ratings & Electrical Characteristics
| Core Architecture | HCS08 (S08 family) |
| Data Bus Width | 8-bit |
| Program Memory Size | 32 KB (32K x 8) Flash |
| RAM Size | 2 KB |
| Maximum CPU Frequency | 40 MHz |
| Number of I/O Pins | 56 |
| Package / Case | 64-LQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Supply Voltage Range | 2.7 V to 5.5 V (operational, typical 5 V) |
| Operating Temperature Range | -40C to +85C (industrial) |
| On-chip ADC | Yes (resolution and channel count per datasheet) |
| Communication Interfaces | SCI (UART), SPI, I2C |
| Timers | 16-bit timer/PWM module(s) |
| Debug Interface | Background Debug Mode (BDM) |
| RoHS Status | Compliant |
| MSL Level | Per JEDEC J-STD-020 (see datasheet) |
| Lead-Free / Halogen-Free | Lead-free per manufacturer datasheet |
MC9S08GB32CFUE Pin Configuration
| Pin 1 | PTA0/TXD — GPIO / SCI TXD (function per datasheet) |
| Pin 2 | PTA1/RXD — GPIO / SCI RXD (function per datasheet) |
| Pin 3 | PTA2 — GPIO (function per datasheet) |
| Pin 4 | PTA3 — GPIO (function per datasheet) |
| Pin 5 | PTA4 — GPIO (function per datasheet) |
| Pin 6 | PTA5 — GPIO / IRQ (function per datasheet) |
| Pin 7 | PTA6 — GPIO (function per datasheet) |
| Pin 8 | PTA7 — GPIO (function per datasheet) |
| Pin 9 | VDD — Power supply (typ. 5 V) |
| Pin 10 | VSS — Ground |
| Pin 11 | PTB0 — GPIO / ADC channel (per datasheet) |
| Pin 12 | PTB1 — GPIO / ADC channel (per datasheet) |
| Pin 13 | PTB2 — GPIO / ADC channel (per datasheet) |
| Pin 14 | PTB3 — GPIO / ADC channel (per datasheet) |
| Pin 15 | PTB4 — GPIO / ADC channel (per datasheet) |
| Pin 16 | PTB5 — GPIO / ADC channel (per datasheet) |
| Pin 17 | PTB6 — GPIO / ADC channel (per datasheet) |
| Pin 18 | PTB7 — GPIO / ADC channel (per datasheet) |
| Pin 19 | PTC0 — GPIO (function per datasheet) |
| Pin 20 | PTC1 — GPIO (function per datasheet) |
| Pin 21 | PTC2 — GPIO (function per datasheet) |
| Pin 22 | PTC3 — GPIO (function per datasheet) |
| Pin 23 | PTC4 — GPIO (function per datasheet) |
| Pin 24 | PTC5 — GPIO (function per datasheet) |
| Pin 25 | PTC6 — GPIO (function per datasheet) |
| Pin 26 | PTC7 — GPIO (function per datasheet) |
| Pin 27 | PTD0 — GPIO / SPI (per datasheet) |
| Pin 28 | PTD1 — GPIO / SPI (per datasheet) |
| Pin 29 | PTD2 — GPIO / SPI (per datasheet) |
| Pin 30 | PTD3 — GPIO / SPI (per datasheet) |
| Pin 31 | PTD4 — GPIO / I2C (per datasheet) |
| Pin 32 | PTD5 — GPIO / I2C (per datasheet) |
| Pin 33 | VDD — Power supply (typ. 5 V) |
| Pin 34 | VSS — Ground |
| Pin 35 | PTE0 — GPIO / timer channel (per datasheet) |
| Pin 36 | PTE1 — GPIO / timer channel (per datasheet) |
| Pin 37 | PTE2 — GPIO / timer channel (per datasheet) |
| Pin 38 | PTE3 — GPIO / timer channel (per datasheet) |
| Pin 39 | PTE4 — GPIO / timer channel (per datasheet) |
| Pin 40 | PTE5 — GPIO / timer channel (per datasheet) |
| Pin 41 | PTE6 — GPIO / timer channel (per datasheet) |
| Pin 42 | PTE7 — GPIO / timer channel (per datasheet) |
| Pin 43 | PTF0 — GPIO (function per datasheet) |
| Pin 44 | PTF1 — GPIO (function per datasheet) |
| Pin 45 | PTF2 — GPIO (function per datasheet) |
| Pin 46 | PTF3 — GPIO (function per datasheet) |
| Pin 47 | PTF4 — GPIO (function per datasheet) |
| Pin 48 | PTF5 — GPIO (function per datasheet) |
| Pin 49 | PTF6 — GPIO (function per datasheet) |
| Pin 50 | PTF7 — GPIO (function per datasheet) |
| Pin 51 | BKGD — Background Debug Mode data |
| Pin 52 | RESET — Reset input (active low) |
| Pin 53 | PTG0 — GPIO (function per datasheet) |
| Pin 54 | PTG1 — GPIO (function per datasheet) |
| Pin 55 | PTG2 — GPIO / XOSC (per datasheet) |
| Pin 56 | PTG3 — GPIO / XOSC (per datasheet) |
| Pin 57 | VDDR — I/O supply voltage |
| Pin 58 | VSS — Ground |
| Pin 59 | PTG4 — GPIO (function per datasheet) |
| Pin 60 | PTG5 — GPIO (function per datasheet) |
| Pin 61 | PTG6 — GPIO (function per datasheet) |
| Pin 62 | PTG7 — GPIO (function per datasheet) |
| Pin 63 | EXTAL — External clock / crystal |
| Pin 64 | XTAL — External clock / crystal |
Typical Applications
MC9S08GB32CFUE is suitable for 6 applications: Industrial Control Panels, White Goods Motor Control, Building Automation Sensor Nodes, USB to UART Bridge, Consumer Appliance Controllers, Automotive Body Electronics.
Industrial Control Panels
The MC9S08GB32CFUE's 8-bit HCS08 core at 40 MHz, 32 KB of Flash, 2 KB of SRAM, and 56 GPIO make it a cost-effective controller for industrial control panels with keypad, LED, and relay I/O. Its on-chip ADC reads sensor signals directly, while SCI/UART, SPI, and I2C link to field-bus transceivers and HMI display modules. The -40C to +85C industrial temperature range and the 64-LQFP package fit tight mechanical enclosures in factory automation. S08 instruction-set simplicity and BDM debug shorten firmware development cycles for ladder-logic-equivalent control code.
Recommended
White Goods Motor Control
Washing machines, dishwashers, and refrigerator inverter boards use the MC9S08GB32CFUE for low-cost BLDC and AC-induction motor commutation. The 16-bit timer/PWM module delivers complementary PWM outputs up to 40 MHz with dead-time insertion suitable for IGBT/MOSFET drivers. ADC channels sample motor current and back-EMF feedback, while the on-chip SCI/UART links to the main appliance MCU. The 64-LQFP footprint allows through-hole and SMD assembly on typical motor-control PCBs.
Recommended
Building Automation Sensor Nodes
HVAC and lighting sensor nodes use the MC9S08GB32CFUE to read temperature, humidity, and occupancy sensors and report to a central controller via I2C or SPI to a wireless module. The 2 KB of SRAM handles small protocol buffers while the 32 KB Flash stores the application code, OTA bootloader, and calibration tables. Low-power stop modes extend battery life in wireless sensor applications, and BDM enables in-system firmware updates during commissioning. The 64-LQFP package integrates easily on sensor boards with mixed-signal conditioning.
Recommended
USB to UART Bridge
Many low-volume embedded products use the MC9S08GB32CFUE as a USB-to-UART bridge controller, with the on-chip SCI/UART driving RS-232 or RS-485 transceivers and a software USB stack on the GPIO/edge-triggered timer. The 32 KB Flash fits a full USB device stack with CDC ACM class descriptors, while 2 KB RAM holds ring buffers. The 64-LQFP package allows hand-assembled and reflow-soldered debug bridges used in industrial gateways and POS equipment where commercial USB bridges are unsuitable.
Recommended
Consumer Appliance Controllers
Microwave ovens, coffee machines, and induction cookers deploy the MC9S08GB32CFUE for keypad scanning, 7-segment LED multiplexing, buzzer control, and triac-based load switching via timer interrupts. The 56 GPIO drive displays and key matrices without external logic, and the on-chip timers debounce inputs without software overhead. The 64-LQFP keeps the BOM short and assembly easy on single-layer consumer PCBs. Industrial temperature grading ensures reliable operation in enclosed appliance housings.
Recommended
Automotive Body Electronics
Body controllers for window lifts, mirror adjusters, and interior lighting use the MC9S08GB32CFUE's CAN-capable peripherals, ADC battery-monitoring inputs, and PWM channels for lamp dimming. While the part itself is industrial-grade, design teams that reuse existing firmware leverage the 8-bit determinism and BDM debug. The 64-LQFP package eases migration to QFP-based automotive modules in qualified product lines, although AEC-Q100 automotive variants must be sourced separately if required.
Recommended
Recommended Products Summary
Engineering reference data for MC9S08GB32CFUE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S08GB60ACFUE | MC9S08GB32CFUER |
|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 64-LQFP (10x10 mm) | 64-LQFP (10x10 mm) - same | 64-LQFP (10x10 mm) - same |
| Core | HCS08 (8-bit) | HCS08 (8-bit) | HCS08 (8-bit) |
| Program Memory (Flash) | 32 KB | 60 KB (+87.5%) | 32 KB (identical) |
| RAM Size | 2 KB | 2 KB (identical per family) | 2 KB (identical) |
| Maximum CPU Frequency | 40 MHz | 40 MHz (identical) | 40 MHz (identical) |
| Number of I/O | 56 | 56 (identical per datasheet) | 56 (identical) |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
Key Differentiators
- Higher Flash headroom in same package (vs MC9S08GB60ACFUE)
- Identical die, alternate packaging variant (vs MC9S08GB32CFUER)
- Mature S08 toolchain availability (vs Generic Kinetis E alternative)
Design Notes
Place 100 nF decoupling capacitors adjacent to every VDD/VSS pair on the 64-LQFP, plus a bulk 10 uF tantalum near the package. Estimated: at 40 MHz and typical I/O toggling, the GB32 core draws low tens of mA, so a single ferrite bead per supply rail plus decoupling typically suffices. Use a separate analog AVSS/AVDD supply pair if the on-chip ADC is enabled to avoid digital switching noise coupling into ADC results.
Route the BDM (BKGD, RESET) signals to a 2x3 or 2x5 debug header with series resistors near the MCU; do not place the header on the opposite side of a noisy power plane. Estimated: 50 ohm trace impedance with a 100 pF load on BKGD is generally acceptable for a few-inch BDM cable. Keep the BDM header within 5 cm of the IC to minimize noise pickup during in-circuit debugging of the Flash erase/program cycles.
Do not power the part above the absolute maximum VDD rating; verify against the latest revision of the NXP datasheet. Estimated: a 5 V supply with >6 V transients (e.g., from motor kickback without a TVS clamp) can permanently damage the device. Always reset the part using the RESET pin held low for at least the minimum pulse width per datasheet, and ensure the voltage monitor reset is enabled in the SOPT register for unattended boot.
Compliance Information
RoHS compliant per NXP product page. Industrial temperature grade (-40C to +85C). Not AEC-Q100 qualified; for automotive use, source an AEC-Q100-qualified S08 variant separately.