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NXP Semiconductors MC908GR16ACFAER
- Part No.:
- MC908GR16ACFAER
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
MC908GR16ACFAER.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,643
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Product details
Overview
MC908GR16ACFAER from NXP (formerly Freescale) is an 8-bit HCS08 microcontroller featuring 16 KB on-chip Flash memory, 512 B RAM, a 10-bit ADC with 8 input channels, and integrated peripherals including ESCI, SPI, two timer modules (TIM1/TIM2), KBI, COP watchdog, and a PLL-based Clock Generator Module. It operates at up to 8 MHz bus frequency and targets low-cost embedded control in industrial sensors and appliance motor interfaces.
For engineers reviewing the MC908GR16ACFAER datasheet, MC908GR16ACFAER pinout, MC908GR16ACFAER application, or MC908GR16ACFAER equivalent, key selection criteria include its 48-pin LQFP package, 2.7–5.5 V supply range, Flash endurance (100k erase/write cycles), COP timeout configurability, and support for Wait/Stop low-power modes with peripheral wake-up capability.
Technical Context
The MC908GR16ACFAER implements the HCS08 CPU core with 16-bit address space, indexed addressing, and 59-instruction set optimized for deterministic real-time control. Its Clock Generator Module integrates a crystal oscillator, PLL with programmable multiplier (×1 to ×32), and base clock selector enabling flexible system clock derivation from external crystals or internal RC sources.
Peripheral integration includes dual 16-bit timer modules supporting input capture, output compare, and PWM generation; an Enhanced Serial Communications Interface (ESCI) compatible with RS-232/RS-485 protocols; and a Keyboard Interrupt Module (KBI) with debounced scan support for up to 8 keys. All modules retain functionality in Wait mode and support selective wake-up from Stop mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-bit address bus and 59-instruction set for deterministic real-time execution |
| Flash Memory | 16 KB on-chip Flash with block protection, 100k erase/write cycles, and in-system programmability |
| RAM Size | 512 bytes of on-chip RAM for data storage and stack operations |
| ADC Resolution | 10-bit successive approximation ADC with 8 analog inputs, ±1 LSB integral nonlinearity |
| Max Bus Frequency | 8 MHz derived from PLL (e.g., 4 MHz crystal ×2), enabling 8 MIPS throughput at 8 MHz |
| Supply Voltage | 2.7–5.5 V operation supports direct interface with 3.3 V and 5 V logic systems without level shifting |
| Low-Power Modes | Wait mode (CPU halted, peripherals active) and Stop mode (all clocks gated, wake-up via IRQ/KBI/ADC) |
Pinout & Package
MC908GR16ACFAER is housed in a 48-pin LQFP (7 mm × 7 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined per Freescale MC68HC908GR16A Rev. 1.0 datasheet Section 1.4 (Pin Assignments) and Section 1.5 (Pin Functions).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: VDD/VSS for digital core; VDDA/VSSA for analog/PLL; VDDAD/VSSAD for ADC reference |
| OSC1, OSC2 | Crytal oscillator inputs | Supports 32 kHz–8 MHz parallel-resonant crystals; internal load capacitors eliminate need for external caps |
| RST | Active-low reset input | Asynchronous reset with internal pull-up; accepts external push-button or supervisor IC assertion |
| IRQ | External interrupt request | Edge-triggered (rising/falling configurable), debounced in hardware, wakes CPU from Wait/Stop modes |
| PTA0–PTA7 | Port A I/O with keyboard scan | Configurable as general-purpose I/O or KBI inputs (KBD0–KBD7); supports matrix keypad scanning |
| PTB0–PTB7 | Port B I/O with ADC inputs | Shares pins with ADC channels AD0–AD7; supports analog input, digital I/O, or comparator functions |
| PTD0–PTD7 | Port D I/O with SPI/UART/TIM | Multi-function: SS (SPI slave select), TxD/RxD (ESCI), T2CH1 (TIM2 input capture), and general I/O |
| PTE0–PTE5 | Port E I/O with TIM/ESCI | Includes TxD (ESCI transmit), TIM1 channel inputs, and general-purpose digital I/O |
Key Features
| Feature | Design Value |
|---|---|
| Programmable PLL clock generator | Enables precise bus frequency scaling (e.g., 4 MHz crystal ×2 = 8 MHz bus) with automatic lock detection and bandwidth control |
| Computer Operating Properly (COP) watchdog | Configurable timeout (0.5 ms to 1.0 s) with software-serviced window; prevents runaway code in safety-critical loops |
| Keyboard Interrupt Module (KBI) | Hardware-accelerated 8-key matrix scan with auto-debounce and interrupt-on-change, reducing CPU polling overhead |
| Enhanced Serial Communications Interface (ESCI) | Full-duplex UART supporting RS-232/RS-485 with programmable baud rate, parity, stop bits, and break detection |
| Two independent 16-bit timer modules | TIM1 and TIM2 each provide input capture, output compare, PWM generation, and free-running counter modes |
| Low-voltage inhibit (LVI) | Monitors VDD and asserts reset if voltage drops below 2.5 V (±0.1 V), preventing erratic operation during brownout |
Applications
| Industrial Sensor Node | Home Appliance Control |
|---|---|
Use Scenario: Standalone temperature/humidity sensor node with local display and serial telemetry. IC Role / Device Role / Timing Role: Main system controller managing ADC sampling, LCD segment drive (via GPIO), ESCI UART transmission, and periodic wake-up from Stop mode. Use Value: Integrated 10-bit ADC eliminates external converter; COP watchdog ensures reliable long-term unattended operation; 2.7–5.5 V range enables direct battery or wall-adapter power. |
Use Scenario: Washing machine main control board managing motor drive signals, water valve actuation, and user interface. IC Role / Device Role / Timing Role: Central MCU coordinating PWM motor control (via TIM outputs), KBI for button panel, and ESCI for service port diagnostics. Use Value: Dual 16-bit timers enable precise motor phase timing; KBI reduces firmware complexity for keypad handling; Flash endurance supports field firmware updates. |
| Smart HVAC Thermostat | POS Peripheral Controller |
Use Scenario: Battery-powered thermostat with ambient sensing, LCD UI, and wired RS-485 communication to HVAC controller. IC Role / Device Role / Timing Role: System-on-chip managing thermistor ADC readings, LCD refresh, KBI for menu navigation, and ESCI in RS-485 half-duplex mode. Use Value: Low-power Stop mode extends battery life; integrated VREFL/VREFH enables ratiometric ADC accuracy; 48-pin LQFP allows compact PCB layout with minimal external components. |
Use Scenario: Point-of-sale peripheral such as barcode scanner controller interfacing with host PC via RS-232 and managing laser/decoder logic. IC Role / Device Role / Timing Role: Dedicated interface controller handling ESCI UART framing, GPIO-driven laser activation, and TIM-based decoder timing windows. Use Value: ESCI's break detection identifies scanner trigger events; TIM modules generate precise pulse widths for laser driver control; Flash memory stores device configuration and firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC908AP64CFUE | 64 KB Flash, 2 KB RAM, same HCS08 core but larger memory and additional SPI/ESCI buffers; no KBI module | Better suited for applications requiring larger firmware footprint or higher serial throughput, but lacks hardware keyboard scan | Select when memory headroom or serial buffer depth outweighs need for KBI; requires software keypad management |
| S9KEAZ128AMLH | Kinetis E-series ARM Cortex-M0+ core, 128 KB Flash, 16 KB RAM, 12-bit ADC, and enhanced peripherals (DMA, USB) | Targets next-generation designs needing higher performance, connectivity, or toolchain continuity with modern NXP platforms | Choose for new designs requiring scalability beyond 8-bit constraints; not drop-in compatible due to architecture and pinout differences |
Compared with MC908GR16ACFAER, MC908AP64CFUE offers greater memory capacity at the cost of keyboard interface hardware, while S9KEAZ128AMLH provides a 32-bit upgrade path with advanced peripherals but requires full hardware and firmware redesign.
Availability
MC908GR16ACFAER is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control units, and smart HVAC thermostats requiring stable component supply and long-term manufacturability.
Supply support for MC908GR16ACFAER 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.
The MC908GR16ACFAER belongs to the legacy HCS08 microcontroller family designed for cost-sensitive, low-power embedded control in appliances, industrial equipment, and consumer electronics where deterministic real-time response and Flash reprogrammability are essential.
FAQ
What is the maximum operating frequency of the MC908GR16ACFAER?
The MC908GR16ACFAER achieves a maximum bus frequency of 8 MHz, derived from its integrated PLL clock generator. For example, a 4 MHz crystal input multiplied by 2 yields the 8 MHz bus clock. This frequency defines instruction execution speed (8 MIPS) and peripheral timing resolution, and is validated across the full 2.7–5.5 V supply range per Freescale MC68HC908GR16A Rev. 1.0 datasheet Section 20.
Does the MC908GR16ACFAER support in-system programming?
Yes, the MC908GR16ACFAER supports in-system programming via its on-chip Flash memory. The device includes dedicated Flash control registers (FPROT, FCNFG, FCDIV) and supports mass erase, page erase, and byte/word programming through standard BDM (Background Debug Mode) interface. This enables field firmware updates without removing the MC908GR16ACFAER from the target PCB.
How does the Keyboard Interrupt Module (KBI) function on the MC908GR16ACFAER?
The KBI on the MC908GR16ACFAER provides hardware-accelerated scanning of up to 8 keys connected to Port A pins (PTA0–PTA7). It includes built-in debounce timing, edge detection, and interrupt generation upon key press/release. Configuration is handled via KBI status/control (KBSCR) and interrupt enable (KBIE) registers, eliminating the need for CPU-intensive polling loops in the MC908GR16ACFAER firmware.
What low-power modes are available on the MC908GR16ACFAER?
The MC908GR16ACFAER supports two primary low-power modes: Wait mode (CPU halted, peripherals remain clocked and functional) and Stop mode (all clocks gated except optional RTC or LPO, with wake-up via IRQ, KBI, ADC conversion complete, or reset). Both modes are entered via STOP or WAIT instructions and are detailed in Chapter 10 of the MC908GR16ACFAER datasheet.
Is the MC908GR16ACFAER pin-compatible with other HCS08 devices?
No, the MC908GR16ACFAER is not universally pin-compatible with other HCS08 microcontrollers. Its 48-pin LQFP package and specific peripheral mapping (e.g., KBI on Port A, ESCI on Port D/E) differ from variants like MC908AP64CFUE (64-pin LQFP) or MC908QT4 (20-pin SOIC). Pin compatibility must be verified per device-specific datasheets; substitution requires PCB layout review.
MC908GR16ACFAER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 48-LQFP
- Series:
- HC08
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- LINbus, SCI, SPI
- Peripherals:
- LVD, POR, PWM
- Number of I/O:
- 37
- Program Memory Size:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 1K x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 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:
MC908GR16ACFAER FAQ
1.How can I place an order for MC908GR16ACFAER through Aetrix?
Please submit a Request for Quotation (RFQ) for MC908GR16ACFAER 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 MC908GR16ACFAER reliable?
The price and inventory of MC908GR16ACFAER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC908GR16ACFAER is usually 5 days.
3.What payment methods are accepted for MC908GR16ACFAER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC908GR16ACFAER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC908GR16ACFAER?
MC908GR16ACFAER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC908GR16ACFAER 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 MC908GR16ACFAER?
For technical support, including MC908GR16ACFAER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC908GR16ACFAER requirements.
6.How does Aetrix verify that MC908GR16ACFAER is sourced from the original manufacturer or authorized distributors?
All MC908GR16ACFAER 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 MC908GR16ACFAER meets industry standards.
7.What is the process for return or replacement of MC908GR16ACFAER?
All MC908GR16ACFAER units undergo pre-shipment inspection (PSI). If there is an issue with MC908GR16ACFAER, 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 MC908GR16ACFAER part is unused and in its original packaging.
Return procedure for MC908GR16ACFAER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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