NXP Semiconductors MC68HC11F1CFN3

Overview

MC68HC11F1CFN3 from Freescale Semiconductor is an 8-bit microcontroller unit (MCU) with 2 KB of on-chip EEPROM, 256 bytes of RAM, and integrated peripherals including SCI, SPI, timer system, and 8-channel 8-bit ADC. It operates at up to 3.2 MHz internal bus speed in single-chip mode and targets embedded control in automotive subsystems, industrial sensors, and legacy instrumentation.

For engineers reviewing the MC68HC11F1CFN3 datasheet, MC68HC11F1CFN3 pinout, MC68HC11F1CFN3 application, or MC68HC11F1CFN3 equivalent, key selection criteria include its 68-pin PLCC package, EEPROM reprogrammability in-system, COP watchdog, and support for both single-chip and expanded memory modes without external glue logic.

Technical Context

The MC68HC11F1CFN3 implements the classic HC11 CPU core with 16-bit index registers (X, Y), 16-bit stack pointer, and condition code register supporting seven status flags. Its memory architecture includes fixed 2 KB EEPROM mapped at $E000–$E7FF, 256-byte RAM at $0000–$00FF, and a configurable 512-byte bootstrap ROM.

Peripherals are tightly coupled via memory-mapped I/O: the 16-bit timer system supports input capture, output compare, real-time interrupt, and pulse accumulation; the 8-channel ADC uses a successive-approximation architecture with software-selectable conversion sequence and sample-and-hold timing controlled by ADCTL register bits.

Key Specifications

Pinout & Package

MC68HC11F1CFN3 is housed in a 68-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration, lead pitch of 0.05 inch (1.27 mm), and body size 1.100 × 1.100 inches (27.94 × 27.94 mm). Pin assignments follow Freescale's standard HC11 PLCC layout per Figure 2-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with MC68HC11F1CFN3, MC68HC11E9CP2 offers more RAM and EEPROM in a larger package but shares identical instruction set and peripheral register mapping; MC9S12XDP512 delivers significantly higher compute throughput and CAN capability but introduces architectural discontinuity and toolchain changes.

Availability

MC68HC11F1CFN3 is available at Aetrix Electronics and suitable for automotive subsystems, industrial sensor nodes, legacy test equipment, and medical infusion pump controllers requiring stable component supply across long-lifecycle programs.

Supply support for MC68HC11F1CFN3 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 was a U.S.-based semiconductor company specializing in microcontrollers, analog, and RF solutions before its acquisition by NXP Semiconductors in 2015.

The MC68HC11F1CFN3 belongs to the HC11 family - designed for cost-sensitive, deterministic real-time control in automotive, industrial, and instrumentation applications where EEPROM-based field updates and low-power operation are essential.

FAQ

What is the maximum bus frequency supported by the MC68HC11F1CFN3?

The MC68HC11F1CFN3 supports a maximum internal bus frequency of 3.2 MHz. This corresponds to a 6.4 MHz crystal or external clock applied to the XTAL/EXTAL pins, as the internal phase-locked loop divides the input by two. Timing-critical peripherals like the ADC and timer must be configured to operate within this clock domain, and all electrical characteristics in Appendix A assume operation at or below this rated speed.

Does the MC68HC11F1CFN3 support in-application programming of its EEPROM?

Yes, the MC68HC11F1CFN3 supports in-application programming (IAP) of its 2 KB on-chip EEPROM. The device includes dedicated EEPROM programming control registers (PPROG) and a CONFIG register that enables/disables write protection. Programming requires execution from RAM or ROM while applying specific voltage and timing sequences documented in Section 4.4.1 - enabling firmware updates without removing the MC68HC11F1CFN3 from the target board.

How many interrupt sources does the MC68HC11F1CFN3 support, and what is their priority order?

The MC68HC11F1CFN3 supports 16 maskable and non-maskable interrupt sources, including IRQ, XIRQ, SCI, SPI, timer overflow, input capture, output compare, RTI, and COP timeout. Priority is fixed in hardware: XIRQ is highest, followed by IRQ, then SCI, SPI, timer, and others as defined in Table 5-1. The CCR register bits I and X control masking of IRQ and XIRQ, respectively, and cannot be overridden by software reordering.

Can the MC68HC11F1CFN3 operate in low-power STOP mode while retaining RAM contents?

Yes, the MC68HC11F1CFN3 retains full RAM contents during STOP mode. In STOP, the internal clock is gated, CPU and peripheral clocks halt, and current drops to under 100 µA (typical), but the 256-byte RAM remains powered and accessible upon wake-up. Wake-up is triggered by IRQ, XIRQ, or RESET assertion. The CONFIG register bit STOPE must be cleared to enable STOP mode entry via the STOP instruction.

What packaging and lead finish does the MC68HC11F1CFN3 use?

The MC68HC11F1CFN3 uses a 68-pin Plastic Leaded Chip Carrier (PLCC) package with J-type leads and a matte tin (Sn) lead finish. Per Freescale's ordering information in Appendix B, the "FN" suffix denotes PLCC packaging, and "3" indicates commercial temperature range (0°C to +70°C). The package conforms to JEDEC MS-026 and is RoHS-compliant per Freescale's environmental program documentation.