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NXP Semiconductors MC68HC705C9AVFNE
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- Part No.:
- MC68HC705C9AVFNE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
MC68HC705C9AVFNE.pdf
- Description:
- IC MCU 8BIT 16KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,259
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Product details
Overview
MC68HC705C9AVFNE from Freescale Semiconductor is a 8-bit HCMOS EPROM-based microcontroller in the M68HC05 family, featuring 15,932 bytes of user EPROM, 352 bytes of RAM, a 16-bit capture/compare timer, asynchronous SCI and synchronous SPI interfaces, and COP watchdog with clock monitor. It operates from 3.0 V to 5.5 V and supports wait/stop low-power modes for embedded control in industrial sensors and legacy automotive subsystems.
For engineers reviewing the MC68HC705C9AVFNE datasheet, MC68HC705C9AVFNE pinout, MC68HC705C9AVFNE application, or MC68HC705C9AVFNE equivalent, key selection considerations include EPROM programmability, dual-configuration capability (C9A/C12A), port D wire-OR mode support, boot ROM presence (239 bytes), and compatibility with 44-pin PLCC mechanical footprint per Case 777-02.
Technical Context
The MC68HC705C9AVFNE implements the M68HC05 CPU core with accumulator, index register, stack pointer, and condition code register. Its memory map is software-configurable to emulate either MC68HC05C9A (full 16 KB address space) or MC68HC05C12A (reduced map), controlled via mask option registers (PBMOR at $3FF2, C12MOR at $3FF1) and C9A option register at $3FDF.
Timer functionality includes input capture and output compare on TCAP/TCMP pins, with dedicated registers for control ($0008), status ($0013), and timing values. The SCI supports idle-line and address-mark wakeup; SPI operates in master/slave mode with SS, SCK, MOSI, and MISO mapped to PD7, PD4, PD3, and PD2 respectively under port D direction control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | M68HC05 8-bit HCMOS architecture with 31 bidirectional I/O lines and 24+6 configurable I/O pins |
| Memory | 15,932 bytes EPROM + 352 bytes RAM (C9A mode); 12,092 bytes EPROM + 176 bytes RAM (C12A mode) |
| Supply Voltage | 3.0 V to 5.5 V DC - enables direct interface with legacy 5 V logic and mixed-voltage systems |
| Peripherals | SCI (asynchronous UART), SPI (synchronous serial), 16-bit capture/compare timer, COP watchdog + clock monitor |
| Package | 44-lead PLCC (Case 777-02), 16.59 mm × 16.59 mm body, 1.27 mm pitch, lead-free compatible |
| Operating Temp | –40 °C to +85 °C - qualified for industrial and under-hood automotive environments |
| Security | EPROM security feature prevents unauthorized readout; not absolute but raises barrier against casual copying |
Pinout & Package
MC68HC705C9AVFNE is housed in a 44-lead Plastic Leaded Chip Carrier (PLCC), Case 777-02, with J-lead profile and surface-mount compatibility. Pin numbering follows standard PLCC convention (Pin 1 = corner mark, counterclockwise).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD / VSS | Power supply / Ground | Single 3.0–5.5 V supply rail; decoupling required at VDD pin for noise immunity |
| OSC1 / OSC2 | Crystal oscillator inputs | Supports external crystal (1–8 MHz) or ceramic resonator; internal oscillator circuitry enabled |
| RESET | Bidirectional reset control | Drives low on POR, COP timeout, or clock monitor failure; accepts external active-low reset pulse |
| IRQ | Interrupt request input | Edge-triggered interrupt source; sensitivity configurable via software or mask option register |
| TCAP / TCMP | Timer capture / compare I/O | Dedicated pins for edge-triggered input capture and PWM/timing output generation |
| PA0–PA7 | Port A data I/O | 8-bit bidirectional port with individual data direction control; no internal pullups |
| PB0–PB7 | Port B data I/O | 8-bit port with software-selectable internal pullups and IRQ enable per bit via PBMOR |
| PC0–PC7 | Port C data I/O | 8-bit port; PC7 supports high-current sink/source for LED/drivers |
| PD0–PD5, PD7 | Port D multifunction I/O | 7-bit port supporting RDI/TDO (SCI), MISO/MOSI/SCK/SS (SPI), and wire-OR mode via SPCR bit 5 |
Key Features
| Feature | Design Value |
|---|---|
| Configurable C9A/C12A mode | Software-selectable memory map and peripheral enablement via MOR registers - eliminates hardware redesign when migrating between variants |
| Port D wire-OR mode | Bit 5 of SPCR enables open-drain output on PD0–PD5/7 - supports shared-bus SCI/SPI arbitration without external logic |
| Boot ROM (239 bytes) | Fixed startup code for EPROM programming and bootloader entry - enables in-system reprogramming without external programmer |
| COP + clock monitor | Dual-failure detection: COP timeout resets MCU if firmware hangs; clock monitor resets on oscillator failure - critical for safety-critical control loops |
| EPROM security | Prevents readout of programmed code via dedicated security fuse - protects firmware IP in cost-sensitive OEM applications |
Applications
| Industrial Sensor Node | Legacy Automotive Subsystem |
|---|---|
Use Scenario: Standalone temperature/humidity sensor with local display and RS-232 telemetry. IC Role / Device Role / Timing Role: Primary controller managing ADC sampling, LCD segment drive, and SCI-based UART communication. Use Value: Integrated SCI eliminates external level-shifter; 352-byte RAM buffers sensor readings; EPROM retains calibrated coefficients across power cycles. | Use Scenario: Dashboard illumination controller responding to CAN bus commands via discrete interface. IC Role / Device Role / Timing Role: Dedicated lighting sequencer interpreting command packets and driving LED strings via PC7 high-current outputs. Use Value: COP watchdog ensures fail-safe dimming on firmware crash; 3.0–5.5 V operation tolerates vehicle battery fluctuations; PLCC package withstands thermal cycling. |
| Motor Control Interface | Smart Power Switch Monitor |
Use Scenario: Brushed DC motor driver with current sensing, overtemp shutdown, and tach feedback. IC Role / Device Role / Timing Role: Real-time supervisor using TCAP/TCMP for RPM measurement and PWM timing, with SCI reporting fault codes. Use Value: 16-bit capture timer measures tach pulses with ±1-count accuracy at 1 MHz; PC7 drives gate logic directly; stop mode reduces quiescent current during idle. | Use Scenario: Monitoring solid-state relay status and load current in programmable logic controller (PLC) backplane. IC Role / Device Role / Timing Role: Isolated I/O conditioner interfacing 24 V field signals to 5 V logic, with SPI-linked diagnostics. Use Value: Port D SPI pins (PD2–PD4/PD7) connect to isolated SPI transceiver; EPROM stores calibration offsets; IRQ handles fast overcurrent interrupts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC705C8ACPE | Same M68HC05 core, 8 KB EPROM, 128 bytes RAM, no SPI, 40-pin DIP package | Lacks SPI and reduced memory - suitable only for simpler control tasks without serial expansion | Select when board space allows DIP and system requires no synchronous serial peripheral interface |
| MC68HC705P6ACPE | Same family, 4 KB EPROM, 64 bytes RAM, no SCI, 28-pin DIP, no COP clock monitor | Missing SCI and clock monitor - limits use to non-communication, non-safety-critical functions | Choose only for cost-constrained, low-complexity timing or I/O expansion where watchdog redundancy is unnecessary |
Compared with MC68HC705C8ACPE and MC68HC705P6ACPE, the MC68HC705C9AVFNE provides the largest on-chip memory, full SCI+SPI dual-serial support, COP+clock monitor redundancy, and PLCC packaging for higher I/O density - making it the most capable variant for integrated control in space- and feature-constrained industrial modules.
Availability
MC68HC705C9AVFNE is available at Aetrix Electronics and suitable for industrial sensor nodes, legacy automotive subsystems, and motor control interfaces requiring stable component supply and long-term obsolescence management.
Supply support for MC68HC705C9AVFNE 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) was a leading designer of embedded processors, analog, and connectivity solutions for automotive, industrial, and consumer markets.
The MC68HC705C9AVFNE belongs to the M68HC05 microcontroller family, engineered for cost-sensitive, low-power embedded control applications where EPROM programmability, peripheral integration, and industrial temperature operation are essential.
FAQ
What is the maximum operating frequency of the MC68HC705C9AVFNE?
The MC68HC705C9AVFNE supports an external crystal or resonator up to 8 MHz, yielding a maximum internal bus frequency of 4 MHz (via on-chip divide-by-two). This is confirmed in Section 12.5 of the Advance Information Data Sheet, which specifies timing parameters for 4 MHz operation at 5.0 Vdc. The device does not support frequencies beyond this limit without violating AC electrical specifications.
Does the MC68HC705C9AVFNE support in-system programming?
Yes, the MC68HC705C9AVFNE includes a 239-byte boot ROM that implements a bootloader mode for in-system EPROM programming. As described in Appendix A, entering bootloader mode via specific reset sequences allows reprogramming via SCI without external hardware programmers - a key feature for field firmware updates in deployed MC68HC705C9AVFNE units.
How is the C9A vs. C12A configuration selected on the MC68HC705C9AVFNE?
The MC68HC705C9AVFNE uses two mask option registers (MORs): C12MOR at address $3FF1 and C9A option register at $3FDF. Writing appropriate values to these EPROM-programmable registers before runtime selects C9A mode (full memory map, software IRQ control) or C12A mode (reduced map, ROM-masked features). Configuration is persistent across power cycles and verified in Chapter 1.3 of the datasheet.
What are the voltage-level requirements for the MC68HC705C9AVFNE's I/O pins?
All I/O pins on the MC68HC705C9AVFNE are CMOS-compatible and tolerate input voltages from VSS to VDD. The device operates from 3.0 V to 5.5 V, and I/O logic thresholds scale accordingly: VIH ≥ 0.7×VDD and VIL ≤ 0.3×VDD. This is specified in Section 12.5 (5.0-Vdc) and 12.6 (3.3-Vdc) of the Electrical Specifications chapter.
Is the MC68HC705C9AVFNE pin-compatible with other M68HC05 family members?
No - the MC68HC705C9AVFNE in 44-lead PLCC (Case 777-02) is not pin-compatible with 40-pin DIP (MC68HC705C9ACPE) or 28-pin DIP (MC68HC705P6ACPE) variants. Pin counts, layouts, and signal assignments differ significantly across packages. Migration requires PCB redesign; only functional equivalence - not mechanical or electrical drop-in replacement - is supported among M68HC05 family members.
MC68HC705C9AVFNE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- HC05
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC05
- Core Size:
- 8-Bit
- Speed:
- 2.1MHz
- Connectivity:
- SCI, SPI
- Peripherals:
- POR, WDT
- Number of I/O:
- 24
- Program Memory Size:
- 16KB (16K x 8)
- Program Memory Type:
- OTP
- EEPROM Size:
- -
- RAM Size:
- 352 x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC705C9AVFNE FAQ
1.How can I place an order for MC68HC705C9AVFNE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC705C9AVFNE 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 MC68HC705C9AVFNE reliable?
The price and inventory of MC68HC705C9AVFNE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC705C9AVFNE is usually 5 days.
3.What payment methods are accepted for MC68HC705C9AVFNE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC705C9AVFNE transactions.
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4.How is shipping managed for MC68HC705C9AVFNE?
MC68HC705C9AVFNE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC705C9AVFNE 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 MC68HC705C9AVFNE?
For technical support, including MC68HC705C9AVFNE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC705C9AVFNE requirements.
6.How does Aetrix verify that MC68HC705C9AVFNE is sourced from the original manufacturer or authorized distributors?
All MC68HC705C9AVFNE 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 MC68HC705C9AVFNE meets industry standards.
7.What is the process for return or replacement of MC68HC705C9AVFNE?
All MC68HC705C9AVFNE units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC705C9AVFNE, 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 MC68HC705C9AVFNE part is unused and in its original packaging.
Return procedure for MC68HC705C9AVFNE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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