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NXP Semiconductors MC68HC705C9ACFN
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- Part No.:
- MC68HC705C9ACFN
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
MC68HC705C9ACFN.pdf
- Description:
- IC MCU 8BIT 16KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,462
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Product details
Overview
MC68HC705C9ACFN from NXP (formerly Freescale) 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 - used in legacy industrial control, appliance timing, and embedded sensor interface applications.
For engineers reviewing the MC68HC705C9ACFN datasheet, MC68HC705C9ACFN pinout, MC68HC705C9ACFN application, or MC68HC705C9ACFN equivalent, key selection criteria include EPROM programmability, dual-configuration support (C9A/C12A), 3.0–5.5 V single-supply operation, 31 I/O lines with high-current PC7, and compatibility with legacy M68HC05 toolchains and bootloaders.
Technical Context
The MC68HC705C9ACFN implements the M68HC05 CPU core with 8-bit ALU, accumulator, index register, stack pointer, and condition code register. Its memory map supports two configurable modes: full C9A mode (16 KB address space, dual-mapped RAM/EPROM) or C12A-compatible mode (reduced memory map, ROM-mask-style option control via MOR registers).
It integrates three major peripherals: an asynchronous SCI supporting idle-line and address-mark wakeup; a synchronous SPI master/slave interface with SS, SCK, MOSI, and MISO on Port D; and a 16-bit timer with input capture and output compare functions, all operating under wait/stop low-power modes with COP timeout and clock monitor reset protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | M68HC05 8-bit CPU with 40-instruction set, inherent/immediate/direct/extended/indexed addressing |
| User Memory | 15,932 bytes EPROM (12,092 bytes in C12A mode); 352 bytes RAM (176 bytes in C12A mode) |
| Supply Voltage | 3.0 V to 5.5 V DC - enables direct interface with 3.3 V and 5 V logic without level shifters |
| I/O Capability | 31 bidirectional I/O lines (PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD5, PD7); PC7 supports high-current sink/source |
| Peripherals | SCI (asynchronous UART), SPI (synchronous master/slave), 16-bit capture/compare timer, COP watchdog + clock monitor |
| Package | 44-pin PLCC (Case 777-02), leaded, surface-mountable with standard reflow profile |
| Operating Temp | −40 °C to +85 °C - qualified for industrial ambient environments |
Pinout & Package
MC68HC705C9ACFN is housed in a 44-lead Plastic Leaded Chip Carrier (PLCC) package (Case 777-02), with gull-wing leads, JEDEC-standard footprint, and thermal pad omitted - suitable for through-hole prototyping and surface-mount production using standard PLCC sockets or reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD / VSS | Power supply / Ground | Dual power pins ensure stable core voltage distribution; decoupling required at both for noise immunity |
| OSC1 / OSC2 | Crystal oscillator inputs | Supports external crystal (1–4 MHz) or ceramic resonator; internal feedback path enabled by default |
| RESET | Active-low reset input/output | Bidirectional: driven low during POR/COP timeout; accepts external active-low reset pulse |
| IRQ | Interrupt request input | Edge-triggered (configurable polarity); shares pin with PB0 when port B interrupt enabled |
| TCAP / TCMP | Timer capture / compare inputs/outputs | Dedicated pins for edge-sensitive input capture and PWM/timing output generation |
| PA0–PA7 | Port A data I/O | 8-bit quasi-bidirectional port; no pullups; configured via DDR A ($0000) |
| PB0–PB7 | Port B data I/O | 8-bit port with software-selectable pullups and IRQ capability per bit (via PBMOR) |
| PC0–PC7 | Port C data I/O | 8-bit port; PC7 supports 20 mA sink/source - usable for LED drive or relay control |
| PD0–PD5, PD7 | Port D multifunction I/O | Hosts SCI (RDI/TDO), SPI (MISO/MOSI/SCK/SS), and wire-OR mode (bit 5 of SPCR) |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable C9A/C12A mode | Runtime-selectable memory map and peripheral enablement via mask option registers (PBMOR, C12MOR) |
| EPROM security lock | Prevents unauthorized read-out of program memory - implemented via EPROM fuse bit at $3FF2 |
| Bootloader-mode programming | On-chip 239-byte boot ROM enables in-system EPROM programming via SCI without external hardware programmer |
| Wire-OR port D configuration | Bit 5 of SPCR enables open-drain behavior on PD0–PD5/PD7 - essential for wired-AND bus arbitration |
| COP + clock monitor | Dual-failure detection: COP timeout resets MCU; clock monitor detects oscillator failure and forces reset |
Applications
| Industrial Motor Control | Home Appliance Timer |
|---|---|
Use Scenario: Embedded timing and sequencing in washing machine drum control and pump activation cycles. IC Role / Device Role / Timing Role: Primary controller executing state-machine logic, managing relay outputs via PC7, and synchronizing with front-panel keypad via Port B. Use Value: 352-byte RAM supports multi-stage cycle buffers; EPROM retention ensures firmware persistence across 10+ year product lifecycles. |
Use Scenario: Oven temperature ramping, display refresh, and safety interlock monitoring in microwave control panels. IC Role / Device Role / Timing Role: System-on-chip managing analog sensor inputs (thermistor), digital UI (LED segments), and audible alerts via SCI-driven buzzer. Use Value: Single 3.3–5.5 V supply simplifies power design; COP watchdog prevents runaway heating sequences. |
| Legacy HVAC Sensor Node | Factory Automation I/O Module |
Use Scenario: Remote temperature/humidity acquisition node interfacing with RS-232 gateway via SCI. IC Role / Device Role / Timing Role: Data concentrator reading analog sensors via external ADC, formatting packets, and transmitting via SCI at 9600 baud. Use Value: Idle-line wakeup allows low-power listening; 15,932-byte EPROM hosts protocol stack and calibration tables. |
Use Scenario: DIN-rail mounted digital I/O expansion module with opto-isolated inputs and transistor outputs. IC Role / Device Role / Timing Role: Local intelligence handling debounce, status reporting, and SPI communication with host PLC over isolated bus. Use Value: 31 I/O lines support 16-in/16-out configuration; Port D wire-OR mode enables shared interrupt signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC705C8ACFN | 12 KB EPROM, 256-byte RAM, no C12A mode support, lacks SCI wakeup features | Suitable only for fixed-function, non-wakeup applications with smaller code footprint | Select when firmware size ≤12 KB and no idle-line/address-mark SCI wakeup is required |
| MC68HC705P6ACFN | 8 KB EPROM, 128-byte RAM, no SPI, only 8-bit timer, no COP clock monitor | Targeted at cost-sensitive, low-complexity control where peripheral count is minimal | Choose for basic I/O sequencing without communications or advanced timing requirements |
Compared with MC68HC705C8ACFN and MC68HC705P6ACFN, the MC68HC705C9ACFN provides the largest EPROM capacity, dual-mode configurability, full SCI/SPI/timer feature set, and robust COP+clock monitor - making it the highest-integration option in the HC705 EPROM series for field-deployable industrial firmware.
Availability
MC68HC705C9ACFN is available at Aetrix Electronics and suitable for industrial motor control, home appliance timer systems, and legacy HVAC sensor nodes requiring stable component supply and long-term obsolescence management.
Supply support for MC68HC705C9ACFN 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 (formerly Freescale Semiconductor) is a global leader in secure connectivity solutions for automotive, industrial, and IoT applications, with deep heritage in 8-bit and 16-bit microcontroller innovation.
The MC68HC705C9ACFN belongs to the M68HC05 family - designed specifically for cost-sensitive, high-reliability embedded control in appliances, industrial equipment, and instrumentation where EPROM-based field-programmability and long-lifecycle support are critical.
FAQ
What is the maximum operating frequency of the MC68HC705C9ACFN?
The MC68HC705C9ACFN operates with an external crystal or resonator up to 4 MHz, yielding a 2 MHz internal CPU clock (divided-by-two oscillator output). This frequency is specified across the full −40 °C to +85 °C temperature range and 3.0–5.5 V supply, ensuring deterministic timing for real-time control loops in the MC68HC705C9ACFN.
Does the MC68HC705C9ACFN support in-system programming?
Yes, the MC68HC705C9ACFN supports in-system EPROM programming via its on-chip 239-byte boot ROM and SCI interface. Using bootloader mode, firmware updates can be performed without removing the IC from the board - a key capability confirmed in Appendix A of the MC68HC705C9ACFN Advance Information Data Sheet.
How does the C9A/C12A configuration mode affect memory mapping in the MC68HC705C9ACFN?
In C9A mode, the MC68HC705C9ACFN enables the full 16 KB memory map including dual-mapped RAM/EPROM regions ($0020–$004F and $0100–$017F); in C12A mode, addresses $0100–$0FFF are disabled, matching the MC68HC05C12A layout. Configuration is controlled by EPROM-programmed mask option registers (PBMOR, C12MOR) prior to runtime.
What I/O pins on the MC68HC705C9ACFN support high-current drive?
Only PC7 supports high-current drive (20 mA sink/source) on the MC68HC705C9ACFN - explicitly documented in Section 1.2 Features and Figure 1-1 block diagram. All other I/O pins are standard CMOS drivers with typical 1–2 mA capability; PC7 is commonly used for driving LEDs, small relays, or optocouplers directly.
Is the MC68HC705C9ACFN pin-compatible with other PLCC-packaged HC705 devices?
No - while the MC68HC705C9ACFN uses the same 44-pin PLCC (Case 777-02) package as MC68HC705C8ACFN and MC68HC705P6ACFN, pin functions differ significantly across variants (e.g., TCAP/TCMP placement, SCI/SPI signal assignment on Port D). Direct PCB substitution is not supported; layout verification against each device's pinout table is mandatory before replacement.
MC68HC705C9ACFN 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC705C9ACFN FAQ
1.How can I place an order for MC68HC705C9ACFN through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC705C9ACFN 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 MC68HC705C9ACFN reliable?
The price and inventory of MC68HC705C9ACFN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC705C9ACFN is usually 5 days.
3.What payment methods are accepted for MC68HC705C9ACFN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC705C9ACFN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68HC705C9ACFN?
MC68HC705C9ACFN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC705C9ACFN 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 MC68HC705C9ACFN?
For technical support, including MC68HC705C9ACFN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC705C9ACFN requirements.
6.How does Aetrix verify that MC68HC705C9ACFN is sourced from the original manufacturer or authorized distributors?
All MC68HC705C9ACFN 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 MC68HC705C9ACFN meets industry standards.
7.What is the process for return or replacement of MC68HC705C9ACFN?
All MC68HC705C9ACFN units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC705C9ACFN, 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 MC68HC705C9ACFN part is unused and in its original packaging.
Return procedure for MC68HC705C9ACFN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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