MC9S08RE8CFJER - 8-Bit S08 MCU 8KB Flash 8MHz LQFP-32 | NXP
MPN: MC9S08RE8CFJER ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.32 | $6.32 |
| 10 | $5.74 | $57.40 |
| 100 | $5.1 | $510.00 |
| 500 | $4.61 | $2,305.00 |
| 1,000 | $4.18 | $4,180.00 |
MC9S08RE8CFJER Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates an 8-bit CPU core, program memory (Flash/ROM), data memory (RAM), and peripheral set (timers, ADC, communication interfaces) into one IC. The 8-bit class sits below 16-bit and 32-bit MCUs in computational throughput but excels at deterministic real-time control, lower power, and lower unit cost, making it ideal for sensor interfacing, keypad scanning, simple motor control, and battery-powered appliances. Within NXP's portfolio hierarchy, 8-bit MCU -> HCS08 family -> S08RE sub-family -> low-power series.
Key features of the MC9S08RE8CFJER include an internal oscillator, low-voltage detection (LVD), power-on reset (POR), pulse-width modulation (PWM) outputs, and a watchdog timer (WDT). It supports multiple low-power modes (wait, stop, and run) and operates from a 2.5V/3.3V supply, which suits handheld instruments and remote controls. The 32-LQFP package provides easy hand-soldering and breadboard-friendly pin spacing.
The MC9S08RE8CFJER uses the HCS08 CPU core, which is a fully static CISC design with a BCD arithmetic extension and a 16-bit stack pointer. BDM (Background Debug Mode) is supported through a single-wire interface, enabling in-circuit programming and debug without an expensive emulator. The Flash memory supports in-application reprogramming via the built-in Flash controller, allowing firmware updates in the field.
Typical applications include universal remote controls, handheld instruments, portable consumer devices, sensor signal conditioning nodes, and low-power wireless control peripherals. The combination of small Flash footprint, low active current, and rich interrupt-driven peripherals makes it well-suited for products where BOM cost and battery life dominate.
A critical design tip is to add a 0.1uF decoupling capacitor between VDD and VSS as close as possible to the IC, plus a bulk capacitor (4.7uF to 10uF) on the supply rail. When configuring the internal oscillator for low-power wakeup timing, verify the trim register value against the datasheet's ICS (Internal Clock Source) section, as default trim may yield inaccurate timing.
This page synthesizes distributor pricing, drop-in NXP/Freescale S08RE family alternatives, and practical design notes not found in a single distributor listing or the manufacturer datasheet alone.
Drop-in alternatives for MC9S08RE8CFJER — 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 MC9S08RE8CFJER (same form factor and footprint) — differing in Maximum CPU Frequency, Operating Temperature, Program Memory Size, RAM Size, Series.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC9S08RE16CFJER
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S08RE8CFJE
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S08RE32CFJER
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S08RG32CFJE
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →MC9S08FL8CLC
✅ Drop-In📋 Reference alternative (not in catalog)
MC9S08RE8CFJER Maximum Ratings & Electrical Characteristics
| Manufacturer | NXP Semiconductors (formerly Freescale) |
| Series | S08RE |
| Core | HCS08 CISC 8-bit |
| Program Memory Size | 8 KB (8K x 8) Flash |
| RAM Size | 1 KB (1K x 8) |
| Maximum CPU Frequency | 8 MHz |
| Number of I/O Lines | 25 |
| Supply Voltage | 2.5 V / 3.3 V |
| Package | 32-LQFP (7x7 mm) |
| Mounting Type | Surface Mount |
| Oscillator Type | Internal |
| Peripherals | LVD, POR, PWM, WDT |
| Operating Temperature | -40 C to +85 C |
| Packaging | Tape & Reel (TR) |
| Compliance | RoHS compliant, PB-Free |
MC9S08RE8CFJER Pin Configuration
| Pin 1 | PTA0/KBIP0/TCLK — Port A bit 0 / keyboard interrupt / timer clock |
| Pin 2 | PTA1/KBIP1 — Port A bit 1 / keyboard interrupt |
| Pin 3 | PTA2/KBIP2 — Port A bit 2 / keyboard interrupt |
| Pin 4 | PTA3/KBIP3 — Port A bit 3 / keyboard interrupt |
| Pin 5 | VDDA — Analog supply voltage |
| Pin 6 | VSSA — Analog ground |
| Pin 7 | PTB0 — Port B bit 0 |
| Pin 8 | PTB1 — Port B bit 1 |
| Pin 9 | PTB2 — Port B bit 2 |
| Pin 10 | PTB3 — Port B bit 3 |
| Pin 11 | PTB4 — Port B bit 4 |
| Pin 12 | PTB5 — Port B bit 5 |
| Pin 13 | PTB6 — Port B bit 6 |
| Pin 14 | PTB7 — Port B bit 7 |
| Pin 15 | PTC0 — Port C bit 0 |
| Pin 16 | PTC1 — Port C bit 1 |
| Pin 17 | PTC2 — Port C bit 2 |
| Pin 18 | PTC3 — Port C bit 3 |
| Pin 19 | PTC4 — Port C bit 4 |
| Pin 20 | PTC5 — Port C bit 5 |
| Pin 21 | VDD — Digital supply voltage |
| Pin 22 | VSS — Digital ground |
| Pin 23 | BKGD/MS — Background Debug Mode / Mode Select |
| Pin 24 | RESET — External reset input (active low) |
| Pin 25 | PTC6 — Port C bit 6 |
| Pin 26 | PTC7 — Port C bit 7 |
| Pin 27 | PTD0 — Port D bit 0 |
| Pin 28 | PTD1 — Port D bit 1 |
| Pin 29 | PTD2 — Port D bit 2 |
| Pin 30 | PTD3 — Port D bit 3 |
| Pin 31 | PTD4 — Port D bit 4 |
| Pin 32 | PTD5 — Port D bit 5 |
Typical Applications
MC9S08RE8CFJER is suitable for 6 applications: Universal Remote Controls, Handheld Instruments and Meters, Portable Consumer Devices, Sensor Signal Conditioning Nodes, Low-Power Wireless Control Peripherals, Appliance Keypad and User Interface.
Universal Remote Controls
The MC9S08RE8CFJER fits universal remote control designs because its 8 KB Flash easily holds IR protocol stacks (NEC, RC5, SIRC) and button-scan firmware, while 1 KB RAM suffices for state buffers. The 8 MHz HCS08 core delivers cycle-accurate IR carrier generation at 38 kHz to 56 kHz without DMA overhead. Low-power Stop and Wait modes reduce standby current to microamp levels for years of battery life on a coin cell. The 25 GPIO lines are sufficient for 4x5 key matrices and LED indicators.
Recommended
Handheld Instruments and Meters
Handheld DMMs, clamp meters, and environmental testers benefit from the MC9S08RE8CFJER's low active power and integrated peripherals including PWM (for buzzer drive) and WDT (for fault recovery). The 8-bit ADC-free design pairs well with external sigma-delta converters via SPI or I2C. The 32-LQFP package offers easy hand-rework and a compact PCB footprint. Internal oscillator trim eliminates the need for an external crystal, reducing BOM cost and saving PCB space.
Recommended
Portable Consumer Devices
For portable consumer devices such as fitness bands, electronic toys, and personal care tools, the MC9S08RE8CFJER provides 8 KB Flash for application logic, low Stop-mode current for battery longevity, and PWM channels for motor or LED brightness control. The internal oscillator eliminates the BOM cost of an external resonator. BDM single-wire debug allows rapid firmware iteration during development. Supply voltage tolerance down to 2.5V supports direct Li-ion battery connection through a low-dropout regulator.
Recommended
Sensor Signal Conditioning Nodes
Industrial and IoT sensor nodes use the MC9S08RE8CFJER as a low-cost signal conditioning front-end that reads analog sensors, performs local filtering, and forwards processed data over UART or SPI to a host controller. The 8 MHz core handles 100 Hz to 1 kHz sample rates with simple FIR or moving-average filters in firmware. The WDT protects unattended nodes from firmware lockups in the field. Low-power modes extend battery life in remote deployments.
Recommended
Low-Power Wireless Control Peripherals
The MC9S08RE8CFJER can act as a control host for low-power wireless modules in wireless key fobs, remote switches, and home automation bridges. The HCS08 core handles button polling, link-layer state machine, and encryption helpers within 8 KB Flash. Sleep current below 1 uA in Stop mode preserves coin-cell batteries for multi-year deployments. PWM channels drive status LEDs and provide feedback to the user during pairing operations.
Recommended
Appliance Keypad and User Interface
Microwave ovens, washing machines, and HVAC controllers use the MC9S08RE8CFJER as a user-interface MCU handling 4x4 or 5x5 key matrix scanning, 7-segment or character LCD drive, and beeper control. The 25 GPIO lines are sufficient for key matrix plus LED indicators. PWM channels generate beeper tones and triac-zero-cross timing for heater control. Internal oscillator with ICS trim keeps BOM cost low while maintaining timing accuracy for debounce algorithms.
Recommended
Recommended Products Summary
Engineering reference data for MC9S08RE8CFJER — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC9S08RE16CFJER | MC9S08RE8CFJE | MC9S08RE32CFJER | MC9S08RG32CFJE | MC9S08FL8CLC |
|---|---|---|---|---|---|---|
| Package | 32-LQFP (7x7) | 32-LQFP (7x7) - same | 32-LQFP (7x7) - same | 32-LQFP (7x7) - same | 32-LQFP (7x7) - same | 32-LQFP - same family |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core | HCS08 8-bit | HCS08 8-bit | HCS08 8-bit | HCS08 8-bit | HCS08 8-bit | HCS08 8-bit |
| Flash Memory | 8 KB | 16 KB (+100%) | 8 KB (same) | 32 KB (+300%) | 32 KB (+300%) | 8 KB (same) |
| RAM | 1 KB | 1 KB | 1 KB | 1 KB or 2 KB | 2 KB | 1 KB |
| Max CPU Frequency | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 20 MHz |
| GPIO Count | 25 | 25 | 25 | 25 | 25 | 28 |
| Supply Voltage | 2.5 V to 3.3 V | 2.5 V to 3.3 V | 2.5 V to 3.3 V | 2.5 V to 3.3 V | 2.5 V to 3.3 V | 2.7 V to 5.5 V |
Key Differentiators
- Lowest Flash option in the S08RE LQFP-32 family (vs MC9S08RE16CFJER)
- Smaller Flash than RG32 family (vs MC9S08RG32CFJE)
- Tape & Reel packaging for high-volume manufacturing (vs MC9S08RE8CFJE)
Design Notes
Place a 0.1 uF decoupling capacitor as close as possible between each VDD/VSS pin pair (pins 21/22 and 5/6) to suppress high-frequency switching noise. Add a bulk 4.7 uF to 10 uF tantalum or ceramic capacitor on the main 3.3V supply rail within 25 mm of the IC. Use a ferrite bead in series with the supply if the MCU shares a rail with noisy loads (relays, motors).
Do not assume the internal oscillator runs at the datasheet's nominal frequency without calibration. Use the ICS trim register (ICSTRM and ICSSC) to trim the reference to within +/- 2% of the target frequency for accurate UART baud rates and ADC timing. After exiting Stop mode, allow 1 ms to 5 ms for the oscillator to stabilize before resuming timing-critical operations.
Keep the BKGD/MS pin trace short (under 50 mm) and away from high-frequency switching nodes to prevent debug interface noise. Route the RESET line with a pull-up resistor (typically 4.7 kOhm) directly to VDD, and place any reset capacitor close to the IC pin. Avoid running digital signal traces parallel to the analog VDDA/VSSA pins to prevent digital switching noise from coupling into the analog supply.
If using PWM outputs to drive inductive loads (relays, solenoids), add a flyback diode across the load and a snubber (100 ohm + 0.01 uF) if switching speeds exceed 1 kHz. For UART lines, ensure the baud-rate tolerance stays within +/- 2.5% to avoid framing errors. The HCS08 SCI peripheral has a built-in fractional baud-rate divider to assist with non-standard crystal frequencies.
Compliance Information
RoHS compliant per NXP product page and distributor listings (PB-Free designation). Not AEC-Q100 qualified; choose an automotive-grade S08 derivative if needed for vehicle applications.