MC9S12UF32PU - 16-bit HCS12 MCU 32KB Flash USB 2.0 | NXP
MPN: MC9S12UF32PU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.2 | $112.00 |
| 100 | $9.85 | $985.00 |
| 500 | $8.95 | $4,475.00 |
| 1,000 | $8.1 | $8,100.00 |
MC9S12UF32PU Overview
Background: A microcontroller (MCU) is a single-chip computer that combines a CPU core, program memory (typically Flash), data memory (RAM), and a rich set of peripherals such as timers, ADC, communication interfaces (UART, SPI, I2C), and increasingly specialized blocks like USB controllers. The HCS12 is NXP's (formerly Freescale's) 16-bit CISC MCU family, descended from the Motorola HC11/HC12 architecture, designed for automotive and embedded control. Microcontrollers like the MC9S12UF32PU sit within the broader hierarchy of embedded processors -> microcontrollers -> 16-bit microcontrollers -> HCS12 family, and are widely used in place of larger 32-bit ARM Cortex-M parts when cost, simplicity, and deterministic 16-bit performance matter more than raw compute.
Key features of the MC9S12UF32PU include integrated USB 2.0 full-speed device functionality, dedicated ATA/ATAPI host interface logic for connecting hard drives and optical storage, and 32 KB Flash for program storage. The 100-pin LQFP (14x14 mm) package gives the part generous I/O for storage peripherals, an MSC class-compliant mass-storage interface, and ample ground and supply pins for the mixed-signal USB PHY rails. The 30 MHz bus clock is generated from an internal PLL driven by an external resonator, while Flash-resident firmware handles the USB stack and ATA command set in firmware.
Technically, the S12 core is a 16-bit accumulator-based CISC design with 20-bit ALU operations and a von Neumann bus architecture. The USB 2.0 device block is on-die and exposes the standard full-speed endpoint set, so designers do not need an external USB transceiver. The integrated ATA/ATAPI host block supports PIO modes commonly used by 2.5-inch hard drives and CD/DVD optical drives, making this MCU a one-chip solution for USB mass-storage enclosures, card readers, and external optical drives.
Typical applications include USB memory card readers, USB-to-ATA bridge adapters for external HDD enclosures, USB-to-ATAPI optical drive controllers, digital photo frames, and industrial data-loggers with removable storage.
When designing with the MC9S12UF32PU, follow the application note guidance for USB 2.0 PHY PCB layout - keep the D+/D- traces length-matched, as short as possible, and routed over a continuous ground plane. Use the manufacturer's recommended 22 ohm series termination and a common-mode choke on the USB DP/DN lines to pass USB compliance.
This page synthesizes distributor pricing, drop-in alternatives from the same NXP S12 family, and practical design notes not found in the bare manufacturer datasheet.
Drop-in alternatives for MC9S12UF32PU — 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 MC9S12UF32PU (same form factor and footprint) — differing in Core, Package, Package Code.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S12UF32PUE
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$8.2 / Unit
View Datasheet →MC9S12UF32VPE
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC9S12UF32CPE
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC9S12UF32PUE-NXP
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC9S12UF32PU
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$8.1 / Unit
View Datasheet →MC9S12UF32PU Maximum Ratings & Electrical Characteristics
| Core | HCS12 16-bit CISC |
| Series | 9S12UF32 |
| Program Memory | 32 KB (32K x 8) Flash |
| CPU Clock Speed | 30 MHz |
| Supply Voltage | 5 V |
| Operating Temperature Grade | Commercial |
| Integrated USB Controller | USB 2.0 full-speed device |
| ATA/ATAPI Host Interface | Yes (PIO modes) |
| Package | 100-LQFP (14x14 mm), gull-wing |
| Package Code | LFQFP |
| Number of Terminals | 100 |
| Mounting Type | Surface Mount |
| Terminal Form | GULL WING |
| Temperature Grade | COMMERCIAL |
| Application Tier | Commercial (per Freescale product tiering) |
MC9S12UF32PU Pin Configuration
| Pin 1 | NC — Not connected (per datasheet) |
| Pin 2 | NC — Not connected (per datasheet) |
| Pin 3 | VDDR — Voltage regulator supply |
| Pin 4 | VSS — Ground |
| Pin 5 | VDDX — External supply (I/O) |
| Pin 6 | VSSX — External ground (I/O) |
| Pin 7 | USB_DP — USB D+ data line |
| Pin 8 | USB_DN — USB D- data line |
| Pin 9 | VUSB — USB 3.3V supply |
| Pin 10 | VSS — Ground |
| Pin 11 | RESET — Active-low reset input |
| Pin 12 | BKGD — Background debug mode pin |
| Pin 13 | MODC — Mode select |
| Pin 14 | XTAL — Crystal oscillator input |
| Pin 15 | EXTAL — Crystal oscillator output |
| Pin 16 | VSSPLL — PLL ground |
| Pin 17 | VDDPLL — PLL supply |
| Pin 18 | DA2 — ATA address bit 2 |
| Pin 19 | DA1 — ATA address bit 1 |
| Pin 20 | DA0 — ATA address bit 0 |
| Pin 21 | DD0 — ATA data bit 0 |
| Pin 22 | DD1 — ATA data bit 1 |
| Pin 23 | DD2 — ATA data bit 2 |
| Pin 24 | DD3 — ATA data bit 3 |
| Pin 25 | DD4 — ATA data bit 4 |
| Pin 26 | DD5 — ATA data bit 5 |
| Pin 27 | DD6 — ATA data bit 6 |
| Pin 28 | DD7 — ATA data bit 7 |
| Pin 29 | DD8 — ATA data bit 8 |
| Pin 30 | DD9 — ATA data bit 9 |
| Pin 31 | DD10 — ATA data bit 10 |
| Pin 32 | DD11 — ATA data bit 11 |
| Pin 33 | DD12 — ATA data bit 12 |
| Pin 34 | DD13 — ATA data bit 13 |
| Pin 35 | DD14 — ATA data bit 14 |
| Pin 36 | DD15 — ATA data bit 15 |
| Pin 37 | DIOR — ATA I/O read strobe |
| Pin 38 | DIOW — ATA I/O write strobe |
| Pin 39 | DCS1 — ATA chip select 1 |
| Pin 40 | DCS0 — ATA chip select 0 |
| Pin 41 | DRESET — ATA device reset |
| Pin 42 | VSS — Ground |
| Pin 43 | VDDX — External supply (I/O) |
| Pin 44 | PAD0 — Port AD bit 0 |
| Pin 45 | PAD1 — Port AD bit 1 |
| Pin 46 | PAD2 — Port AD bit 2 |
| Pin 47 | PAD3 — Port AD bit 3 |
| Pin 48 | PAD4 — Port AD bit 4 |
| Pin 49 | PAD5 — Port AD bit 5 |
| Pin 50 | PAD6 — Port AD bit 6 |
| Pin 51 | PAD7 — Port AD bit 7 |
| Pin 52 | PAD8 — Port AD bit 8 |
| Pin 53 | PAD9 — Port AD bit 9 |
| Pin 54 | PAD10 — Port AD bit 10 |
| Pin 55 | PAD11 — Port AD bit 11 |
| Pin 56 | PAD12 — Port AD bit 12 |
| Pin 57 | PAD13 — Port AD bit 13 |
| Pin 58 | PAD14 — Port AD bit 14 |
| Pin 59 | PAD15 — Port AD bit 15 |
| Pin 60 | VSS — Ground |
| Pin 61 | VDDX — External supply (I/O) |
| Pin 62 | PT0 — Port T bit 0 (TIM channel) |
| Pin 63 | PT1 — Port T bit 1 (TIM channel) |
| Pin 64 | PT2 — Port T bit 2 (TIM channel) |
| Pin 65 | PT3 — Port T bit 3 (TIM channel) |
| Pin 66 | PT4 — Port T bit 4 (TIM channel) |
| Pin 67 | PT5 — Port T bit 5 (TIM channel) |
| Pin 68 | PT6 — Port T bit 6 (TIM channel) |
| Pin 69 | PT7 — Port T bit 7 (TIM channel) |
| Pin 70 | PJ0 — Port J bit 0 |
| Pin 71 | PJ1 — Port J bit 1 |
| Pin 72 | PJ2 — Port J bit 2 |
| Pin 73 | PJ3 — Port J bit 3 |
| Pin 74 | PJ4 — Port J bit 4 |
| Pin 75 | PJ5 — Port J bit 5 |
| Pin 76 | PJ6 — Port J bit 6 |
| Pin 77 | PJ7 — Port J bit 7 |
| Pin 78 | VSS — Ground |
| Pin 79 | VDDX — External supply (I/O) |
| Pin 80 | PP0 — Port P bit 0 (PWM) |
| Pin 81 | PP1 — Port P bit 1 (PWM) |
| Pin 82 | PP2 — Port P bit 2 (PWM) |
| Pin 83 | PP3 — Port P bit 3 (PWM) |
| Pin 84 | PP4 — Port P bit 4 (PWM) |
| Pin 85 | PP5 — Port P bit 5 (PWM) |
| Pin 86 | PP6 — Port P bit 6 (PWM) |
| Pin 87 | PP7 — Port P bit 7 (PWM) |
| Pin 88 | PS0 — Port S bit 0 (SPI) |
| Pin 89 | PS1 — Port S bit 1 (SPI) |
| Pin 90 | PS2 — Port S bit 2 (SPI MISO) |
| Pin 91 | PS3 — Port S bit 3 (SPI MOSI) |
| Pin 92 | PS4 — Port S bit 4 (SPI SCK) |
| Pin 93 | PS5 — Port S bit 5 |
| Pin 94 | PS6 — Port S bit 6 |
| Pin 95 | PS7 — Port S bit 7 |
| Pin 96 | SCI_TX — SCI transmit (UART) |
| Pin 97 | SCI_RX — SCI receive (UART) |
| Pin 98 | VSS — Ground |
| Pin 99 | VDDX — External supply (I/O) |
| Pin 100 | TEST — Test mode pin (tie to VSS in normal operation) |
Typical Applications
MC9S12UF32PU is suitable for 6 applications: USB Memory Card Reader, USB to ATA/ATAPI HDD Bridge Enclosure, USB to ATAPI External Optical Drive, Digital Photo Frame with USB Storage, USB Industrial Data Logger with Removable Storage, USB MP3 Player with Hard Drive.
USB Memory Card Reader
The MC9S12UF32PU is purpose-designed for USB memory card readers, where the integrated USB 2.0 full-speed device controller and 32 KB Flash are perfectly matched to firmware running the USB Mass Storage Class (MSC) bulk-only transport. The on-chip USB PHY eliminates the external transceiver, cutting BOM to just the MCU, an LDO, and the card socket. The 30 MHz HCS12 CPU has more than enough headroom for SCSI command set handling, and the 100-LQFP gives generous GPIO for card detection, write-protect, and LED drive.
Recommended
USB to ATA/ATAPI HDD Bridge Enclosure
For external 2.5-inch HDD enclosures, the MC9S12UF32PU's integrated ATA/ATAPI host interface directly drives PIO-mode IDE signals (DD[15:0], DIOR, DIOW, DCS, DRESET) without an external bridge chip. Combined with the USB device port, this gives a true single-chip USB-ATA bridge that used to require separate SCSI-ATA bridge ASICs. The 100-LQFP package provides enough I/O for parallel ATA bus plus USB, and 32 KB Flash is adequate for MSC plus ATA command translation firmware in commercial enclosures.
Recommended
USB to ATAPI External Optical Drive
External CD/DVD optical drives use the ATAPI protocol extension of ATA, and the MC9S12UF32PU's ATAPI block supports the command set needed for packet-style transfers over USB Mass Storage Class. With the 16-bit HCS12 core handling ATAPI packet construction and the on-chip USB device managing bulk endpoints, the design eliminates external bridge ASICs. The 100-LQFP gives enough pin budget for the full 16-bit ATA data bus plus CD-audio analog interface routing typically found in optical drive designs.
Recommended
Digital Photo Frame with USB Storage
Digital photo frames that accept images from USB sticks or memory cards use the MC9S12UF32PU's USB device port plus ATA-like storage access to read media and feed a downstream display controller. The 30 MHz CPU and 32 KB Flash handle FAT32 filesystem parsing and thumbnail generation at low cost, while the commercial temperature grade keeps BOM within consumer-product budgets. The 100-LQFP provides sufficient GPIO for display parallel interface and IR remote control.
Recommended
USB Industrial Data Logger with Removable Storage
Industrial data loggers with removable CompactFlash or HDD storage use the MC9S12UF32PU as the USB host bridge plus storage controller, logging sensor data to ATA media and exposing files to a PC via USB device MSC. The 100-LQFP industrial-friendly package is well suited to conformal-coated PCBs, and the HCS12's deterministic interrupt latency is a plus for time-stamped logging. The commercial temperature grade is sufficient for most indoor industrial enclosures.
Recommended
USB MP3 Player with Hard Drive
Older-generation portable MP3 players with 1.8-inch or 2.5-inch hard drives used the MC9S12UF32PU as the USB-MSC plus ATA host bridge, decoding MP3 in a companion DAC chip while the S12 manages file I/O and USB transfers. The 30 MHz HCS12 core handles USB bulk transfer protocol and FAT32 directory walks without taxing the audio DSP. The 100-LQFP gives enough I/O for the ATA bus, USB, keypad, and LCD, and commercial temperature grade is appropriate for indoor portable use.
Recommended
Recommended Products Summary
Engineering reference data for MC9S12UF32PU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S12UF32PUE | MC9S12UF32VPE | MC9S12UF32CPE |
|---|---|---|---|---|
| Brand | NXP Semiconductors (formerly Freescale) | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 100-LQFP (14x14) | 100-LQFP (14x14) - same | 100-LQFP (14x14) - same | 100-LQFP (14x14) - same |
| Core | HCS12 16-bit CISC | HCS12 16-bit CISC - same | HCS12 16-bit CISC - same | HCS12 16-bit CISC - same |
| CPU Clock | 30 MHz | 30 MHz | Lower speed grade | 30 MHz |
| Program Flash | 32 KB | 32 KB | 32 KB | 32 KB |
| USB 2.0 Controller | Yes (device) | Yes (device) | Yes (device) | Yes (device) |
| ATA/ATAPI Host | Yes (PIO modes) | Yes (PIO modes) | Yes (PIO modes) | Yes (PIO modes) |
| Temperature Grade | Commercial (0C to +70C) | Extended commercial (-40C to +85C) | Commercial | Extended commercial |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V |
Key Differentiators
- Single-chip USB 2.0 device + ATA/ATAPI host integration (vs Generic 16-bit MCU with external USB PHY and ATA bridge ASIC)
- 30 MHz HCS12 core with deterministic interrupt latency (vs Lower-end 8-bit MCUs (e.g., 8051 class))
- 100-LQFP with abundant GPIO for parallel ATA bus (vs Smaller QFP packages with limited I/O)
Design Notes
USB 2.0 layout is critical on the MC9S12UF32PU. Route the USB_DP and USB_DN differential pair with 90 ohm differential impedance, length-matched to within 150 mil, and over an unbroken ground reference plane. Place the 22 ohm series termination resistors within 4 mm of the MCU pins and consider a common-mode choke for EMI. The integrated USB PHY derives its 3.3V rail from VUSB - place a 1 uF ceramic + 100 nF ceramic bypass right at the VUSB pin and a 4.7 uF bulk near the USB connector shield.
The ATA/ATAPI host bus on this MCU runs at PIO-mode timing, which is sensitive to bus loading. Keep the 16-bit DD[15:0] data bus and DA[2:0] address lines length-matched within 1 inch and avoid routing them parallel to the USB DP/DN pair or other high-speed signals. Series-terminate the data bus with 33 ohm resistors near the MCU if the ATA cable exceeds 6 inches, and ensure DIOR/DIOW strobes have clean edges by adding 10 kohm pull-ups to VDDX where recommended by the application note.
Power sequencing on the MC9S12UF32PU: VDDX (5V I/O) and VDDR (regulator input) should rise together, with VDDPLL following no later than VDDX. Place a 100 nF ceramic + 4.7 uF bulk on each VDDX pin and a 1 uF + 100 nF pair on VDDPLL/VSSPLL to keep the 30 MHz PLL clean. The internal voltage regulator powers the core logic from VDDR - do not back-drive any internal rail. Hold RESET low until VDDX is stable for at least 1 ms per the datasheet, and tie TEST pin to VSS with a 10 kohm resistor for production boards.
Compliance Information
RoHS, REACH, lead-free, halogen-free, and conflict-minerals compliance status are not explicitly stated in the verified distributor listings provided. Request certificates directly from NXP via authorized distributors for mission-critical compliance decisions. Part is commercial-grade per Freescale product tiering, not AEC-Q100 qualified.
