NXP Semiconductors MC68HC16Z1CEH16

Overview

MC68HC16Z1CEH16 from Freescale Semiconductor is a 16-bit microcontroller unit (MCU) featuring the CPU16 core, 16 KB on-chip SRAM, no ROM, 10-bit ADC with 8 channels, QSM serial interface (QSPI + SCI), and GPT timer. It operates at 16 MHz max, supports external bus expansion, and targets industrial control and embedded instrumentation.

For engineers reviewing the MC68HC16Z1CEH16 datasheet, MC68HC16Z1CEH16 pinout, MC68HC16Z1CEH16 application, or MC68HC16Z1CEH16 equivalent, key selection criteria include its 16-bit CPU16 architecture, absence of on-chip ROM (requires external program memory), 16 MHz bus clock capability, QSM dual-serial interface support, and 80-pin PQFP package with full external bus interface.

Technical Context

The MC68HC16Z1CEH16 implements the CPU16 instruction set with 16-bit data/32-bit address capability via address extension registers. Its System Integration Module (SIM) provides clock synthesis, interrupt arbitration, chip-select generation, and external bus control with dynamic sizing for 8/16-bit peripherals.

It integrates a Queued Serial Module (QSM) combining QSPI and SCI controllers, enabling simultaneous synchronous and asynchronous serial communication. The 10-bit ADC supports software- or timer-triggered conversions across eight analog inputs, with internal reference options and configurable sample time.

Key Specifications

Pinout & Package

MC68HC16Z1CEH16 is housed in an 80-pin PQFP (Plastic Quad Flat Package) with 0.65 mm lead pitch, JEDEC MS-026 compliant, thermal pad optional. Pin functions are defined per the M68HC16Z Series User's Manual Section 3.4 and Figure 3-2 (Pin Assignment Diagram).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit microcontroller applications.

Compared with MC68HC16Z2CEH16, the MC68HC16Z1CEH16 trades embedded ROM for flexibility in firmware updates and reduced BOM count; versus MC9328MX1CZK, it offers deterministic real-time latency and minimal power at the cost of raw throughput and ecosystem maturity.

Availability

MC68HC16Z1CEH16 is available at Aetrix Electronics and suitable for industrial automation, motor control, and legacy equipment modernization requiring stable component supply, long-term lifecycle assurance, and consistent electrical behavior across production batches.

Supply support for MC68HC16Z1CEH16 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 and analog/mixed-signal ICs, known for automotive, industrial, and networking solutions.

The M68HC16Z series was developed as a high-integration 16-bit MCU family targeting cost-sensitive, real-time industrial controls with robust external bus expansion and debug capabilities - directly extending the 68HC11 ecosystem.

FAQ

What is the maximum operating frequency of the MC68HC16Z1CEH16?

The MC68HC16Z1CEH16 supports a maximum bus clock frequency of 16 MHz, which governs external memory access timing, peripheral operation, and instruction execution rate. This frequency is derived from the internal clock synthesizer and is specified under standard V_DD = 5.0 V and ambient temperature conditions. The MC68HC16Z1CEH16 does not include an on-chip PLL; clock synthesis relies on external crystal or oscillator input to the EXTAL/XTAL pins.

Does the MC68HC16Z1CEH16 include on-chip program memory?

No, the MC68HC16Z1CEH16 contains 16 KB of on-chip SRAM but no masked ROM or Flash memory. It requires external program memory (e.g., EPROM, Flash, or EEPROM) connected via its full 24-bit address / 16-bit data bus. This distinguishes it from the MC68HC16Z2CEH16 and MC68HC16Z3CEH16 variants, which integrate 32 KB and 64 KB of masked ROM respectively.

What serial communication interfaces are supported by the MC68HC16Z1CEH16?

The MC68HC16Z1CEH16 integrates a Queued Serial Module (QSM) that combines both QSPI (queued serial peripheral interface) and SCI (serial communication interface) functionality. QSPI supports master/slave SPI communication with hardware FIFOs and wrap-around modes; SCI provides full-duplex UART operation with programmable baud rates and framing options. Both operate independently under shared QSM control logic.

Is the MC68HC16Z1CEH16 pin-compatible with other members of the M68HC16Z family?

Yes, the MC68HC16Z1CEH16 shares the same 80-pin PQFP package and pinout with MC68HC16Z2CEH16, MC68HC16Z3CEH16, and MC68HC16Z4CEH16. All share identical external bus signals, reset/interrupt pin assignments, and clock interface. Differences lie in on-chip memory content (ROM presence/size) and peripheral inclusion (e.g., MCCI in Z4), not pin function or electrical behavior.

What debug capabilities does the MC68HC16Z1CEH16 provide?

The MC68HC16Z1CEH16 includes on-chip Background Debug Mode (BDM) supporting non-intrusive breakpoints, real-time opcode tracing via IPIPE0/IPIPE1 signals, and register visibility during halted execution. BDM uses a dedicated serial interface (BKGD pin) and requires no external emulator - enabling field firmware updates and diagnostics without board modifications. This capability is fully retained in the MC68HC16Z1CEH16 despite its lack of on-chip ROM.