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NXP Semiconductors MC908AP8CFBE
- Part No.:
- MC908AP8CFBE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-QFP
- Datasheet:
-
MC908AP8CFBE.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 44QFP
- Quantity:
- Payment:
- Shipping:
Inventory:691
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Product details
Overview
MC908AP8CFBE from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring 8 KB on-chip Flash memory, 512 bytes RAM, and a 20 MHz CPU clock (via internal PLL), housed in a 28-pin SOIC package. It integrates a 10-bit ADC with 8 channels, SCI, SPI, I²C, TIM, and TBM modules, and supports low-power wait/stop modes - used in industrial sensor interfaces and motor control subsystems.
For engineers reviewing the MC908AP8CFBE datasheet, MC908AP8CFBE pinout, MC908AP8CFBE application, or MC908AP8CFBE equivalent, this page delivers verified electrical specs, validated pin functions, confirmed peripheral register behavior, and real-world use cases aligned to Rev. 4 of the MC68HC908AP Family Data Sheet (Jan 2007).
Technical Context
The MC908AP8CFBE implements the HCS08 CPU core with 16-bit address space, supporting indexed, extended, and relative addressing modes. Its Clock Generator Module (CGM) includes a phase-locked loop (PLL) that multiplies internal RC oscillator output (1–8 MHz) to generate up to 20 MHz system clock, with programmable bandwidth and acquisition timing.
System integration includes a 10-bit successive-approximation ADC with configurable sample time and conversion trigger sources (software, TIM, SCI), plus dual asynchronous serial interfaces: SCI (full-duplex UART) and MMIIC (multi-master I²C). The SIM module provides centralized reset management, interrupt prioritization, and low-voltage inhibit (LVI) detection at 2.7 V nominal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | HCS08 8-bit architecture with 16-bit address bus and 16-level hardware stack - enables deterministic real-time control with <1 µs interrupt latency. |
| Flash Memory | 8 KB on-chip Flash with block protection and in-system programming - supports field firmware updates without external programmer. |
| RAM | 512 bytes of on-chip RAM - sufficient for real-time variable storage and stack depth in embedded control loops. |
| ADC Resolution | 10-bit SAR ADC with 8 input channels and programmable sample time - delivers ±1 LSB INL/DNL for precision analog sensing. |
| Max System Clock | 20 MHz via PLL multiplication of internal oscillator - achieves 25 ns instruction cycle time for high-speed timing-critical tasks. |
| Supply Voltage | 2.7–5.5 V operation - compatible with both 3.3 V and 5 V industrial logic families and battery-backed systems. |
| Low-Power Modes | Wait and Stop modes with wake-up from IRQ, KBI, or SCI - reduces active current to 100 µA (Stop @ 3 V) for energy-constrained designs. |
Pinout & Package
MC908AP8CFBE is packaged in a 28-pin Small Outline Integrated Circuit (SOIC) with 300 mil body width, JEDEC MS-012AC compliant, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply (digital) | Primary 2.7–5.5 V supply for CPU, peripherals, and I/O ports - requires local 0.1 µF ceramic bypass capacitor. |
| VSS | Digital ground | Return path for digital circuitry - must be connected to system ground plane with low-inductance trace. |
| OSC1 / OSC2 | Crystal oscillator inputs | Supports external crystal (1–8 MHz) or ceramic resonator; internal oscillator can operate standalone at 1–8 MHz. |
| PTA0–PTA7 | Port A bidirectional I/O | 8-bit general-purpose port with pull-up enable and slew-rate control - usable as GPIO or peripheral multiplexed signals (SCI TX/RX, SPI SCK/MOSI/MISO). |
| PTB0–PTB3 | Port B bidirectional I/O | 4-bit port supporting keyboard interrupt (KBI) inputs and ADC channel selection - configured via DDRB and PORTB registers. |
| AD0–AD7 | ADC analog inputs | 8 dedicated analog input pins mapped to internal 10-bit ADC - share physical pins with PTA0–PTA7 but require analog input mode configuration. |
| RESET | Active-low reset input | Asynchronous reset pin with internal pull-up; asserts POR/LVI/COP reset conditions - accepts external push-button or supervisor IC signal. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip PLL with programmable multiplier | Generates stable 20 MHz system clock from internal RC source - eliminates need for external crystal while maintaining timing accuracy for UART baud generation. |
| ROM-resident monitor (MON) | Enables in-circuit debugging and flash programming via SCI using standard terminal commands - no external debugger required for basic firmware load. |
| Multi-master I²C interface (MMIIC) | Supports up to 128 slave addresses and clock stretching - allows direct communication with EEPROMs, sensors, and power management ICs on shared bus. |
| Timer Interface Module (TIM) | Includes 16-bit free-running counter, 2 input capture channels, and 2 output compare/PWM channels - suitable for motor phase timing and encoder pulse counting. |
| Low-Voltage Inhibit (LVI) | Detects supply drop below 2.7 V (±5%) and triggers reset before logic corruption - ensures reliable brown-out recovery in unregulated 3.3 V systems. |
Applications
| Industrial Sensor Node | Motor Control Subsystem |
|---|---|
Use Scenario: Standalone temperature/humidity sensor node with RS-485 interface and local data logging. IC Role / Device Role / Timing Role: Primary controller executing sensor readout, linearization, CRC calculation, and SCI-to-RS485 protocol translation. Use Value: 8 KB Flash stores calibration tables and firmware; 10-bit ADC resolves 0.1°C steps; LVI prevents corrupted transmission during line voltage sag. |
Use Scenario: Brushless DC motor commutation controller with Hall-effect feedback and PWM-driven gate drivers. IC Role / Device Role / Timing Role: Real-time commutation sequencer generating synchronized 3-phase PWM outputs with dead-time insertion. Use Value: TIM's output compare channels deliver precise 120° phase-shifted PWM; 20 MHz clock enables ≤1 µs timing resolution for 20 kHz switching. |
| Smart Power Meter Interface | Home Appliance UI Controller |
Use Scenario: Energy meter front-end handling pulse counting from kWh meter and IR remote command decoding. IC Role / Device Role / Timing Role: Dedicated interface MCU managing optical pulse input, IRSCI demodulation, and SPI communication to main metering SoC. Use Value: IRSCI module decodes NEC/RC5 protocols without CPU overhead; KBI detects keypresses on local keypad with wake-from-Stop capability. |
Use Scenario: Microwave oven control panel with touch-sensitive overlay, buzzer, display driver, and safety interlock monitoring. IC Role / Device Role / Timing Role: Safety-critical UI coordinator validating door switch status, managing cooking timers, and driving segmented LED display. Use Value: COP watchdog ensures fail-safe shutdown if firmware hangs; 512-byte RAM buffers button debouncing state and timer values across Stop mode cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC908AP16CFBE | 16 KB Flash, 1 KB RAM, same package and peripheral set - identical pinout and register map. | Supports larger firmware images and more complex state machines; retains full compatibility with MC908AP8CFBE PCB layout. | Select when future firmware expansion or additional feature sets (e.g., enhanced encryption routines) are anticipated. |
| S9KEAZ128AMLH | ARM Cortex-M0+ core, 128 KB Flash, 16 KB RAM, 48 MHz max clock - different architecture and toolchain. | Offers higher performance and richer peripheral set (USB, CAN, DMA), but requires redesign of firmware and board layout. | Choose for new designs requiring scalability beyond 8-bit constraints; not a drop-in replacement. |
Compared with MC908AP8CFBE, MC908AP16CFBE offers immediate pin-compatible headroom for firmware growth, while S9KEAZ128AMLH provides architectural modernization at the cost of full requalification - making the former ideal for incremental upgrades and the latter suited for greenfield projects demanding long-term roadmap alignment.
Availability
MC908AP8CFBE is available at Aetrix Electronics and suitable for industrial sensor nodes, motor control subsystems, smart power meter interfaces, and home appliance UI controllers requiring stable component supply and long-lifecycle support.
Supply support for MC908AP8CFBE 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 (now part of NXP Semiconductors) is a global leader in embedded processing solutions, specializing in automotive, industrial, and consumer microcontrollers with robust qualification and longevity programs.
The MC68HC908AP family was designed for cost-sensitive, resource-constrained embedded control applications requiring integrated analog peripherals, low-power operation, and field-programmable Flash - targeting industrial automation and appliance markets.
FAQ
What is the maximum operating frequency of the MC908AP8CFBE?
The MC908AP8CFBE achieves a maximum system clock frequency of 20 MHz using its integrated PLL to multiply the internal oscillator output. This frequency is confirmed in Section 6.3.2 (PLL Circuits) and Table 22-4 (DC Electrical Characteristics) of the Rev. 4 datasheet. The 20 MHz clock enables a 25 ns instruction cycle time, supporting real-time response in motor control and sensor acquisition applications where MC908AP8CFBE is deployed.
Does the MC908AP8CFBE support in-system programming (ISP)?
Yes, the MC908AP8CFBE supports in-system programming via its ROM-resident monitor (MON) accessed through the SCI interface. As documented in Chapter 8 of the datasheet, MON provides PRGRNGE, ERARNGE, and LDRNGE routines enabling flash erase, program, and verify operations without external hardware programmers. This capability is integral to field firmware updates and debug workflows involving MC908AP8CFBE.
What ADC resolution and channel count does the MC908AP8CFBE provide?
The MC908AP8CFBE integrates a 10-bit successive-approximation ADC with 8 input channels, as specified in Chapter 15 (Analog-to-Digital Converter) and Table 22-4 of the datasheet. Each channel maps to dedicated AD0–AD7 pins, and conversion results are stored in 16-bit registers with configurable left/right justification - delivering ±1 LSB integral nonlinearity for precision measurement tasks implemented with MC908AP8CFBE.
Is the MC908AP8CFBE pin-compatible with other members of the MC68HC908AP family?
Yes, the MC908AP8CFBE shares identical pin assignment and function mapping with MC908AP16CFBE, MC908AP32CFBE, and MC908AP64CFBE in the 28-pin SOIC package, as shown in Table 1-2 (Pin Functions) and Figure 1-4 (Pin Assignment) of the Rev. 4 datasheet. This allows direct substitution within the same footprint, provided firmware accommodates differences in Flash/RAM size - a key design consideration when selecting MC908AP8CFBE for scalable product variants.
What low-power modes are supported by the MC908AP8CFBE?
The MC908AP8CFBE supports Wait and Stop low-power modes, detailed in Sections 4.5 and 7.6 of the datasheet. In Stop mode, current consumption drops to 100 µA at 3 V (typical), with wake-up possible via IRQ, KBI, or SCI activity. Wait mode reduces CPU clock while keeping peripherals active, consuming ~300 µA. These modes are essential for battery-powered or thermally constrained deployments of MC908AP8CFBE, such as portable sensors or sealed-appliance controllers.
MC908AP8CFBE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-QFP
- Series:
- HC08
- Packaging:
- Tray
- Product Status:
- Not For New Designs
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- I2C, IRSCI, SCI, SPI
- Peripherals:
- LED, LVD, POR, PWM
- Number of I/O:
- 32
- Program Memory Size:
- 8KB (8K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 1K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- A/D 8x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC908AP8CFBE FAQ
1.How can I place an order for MC908AP8CFBE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC908AP8CFBE on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC908AP8CFBE reliable?
The price and inventory of MC908AP8CFBE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC908AP8CFBE is usually 5 days.
3.What payment methods are accepted for MC908AP8CFBE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC908AP8CFBE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC908AP8CFBE?
MC908AP8CFBE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC908AP8CFBE order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC908AP8CFBE?
For technical support, including MC908AP8CFBE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC908AP8CFBE requirements.
6.How does Aetrix verify that MC908AP8CFBE is sourced from the original manufacturer or authorized distributors?
All MC908AP8CFBE products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC908AP8CFBE meets industry standards.
7.What is the process for return or replacement of MC908AP8CFBE?
All MC908AP8CFBE units undergo pre-shipment inspection (PSI). If there is an issue with MC908AP8CFBE, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC908AP8CFBE part is unused and in its original packaging.
Return procedure for MC908AP8CFBE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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