NXP Semiconductors MC68HC16Z1CAG16

Overview

MC68HC16Z1CAG16 from Freescale Semiconductor is a 16-bit microcontroller unit (MCU) featuring the CPU16 core, 16 KB on-chip SRAM, 512-byte internal RAM, and integrated Queued Serial Module (QSM) with QSPI and SCI interfaces. It operates at 16 MHz, supports external bus expansion up to 16 MB address space, and targets embedded control applications requiring deterministic real-time response and low-power STOP modes.

For engineers reviewing the MC68HC16Z1CAG16 datasheet, MC68HC16Z1CAG16 pinout, MC68HC16Z1CAG16 application, or MC68HC16Z1CAG16 equivalent, key selection criteria include its 16-bit CPU16 architecture, 16 MHz maximum clock frequency, external bus interface with dynamic sizing, QSM-based serial peripheral support, and compatibility with M68HC11 instruction set extensions for legacy migration paths.

Technical Context

The MC68HC16Z1CAG16 implements the CPU16 core with 16-bit data path, 24-bit addressing, and extended indexed addressing modes supporting efficient memory-mapped I/O and large data structures. Its System Integration Module (SIM) provides clock synthesis, interrupt arbitration, reset control, and chip-select logic for external memory mapping.

It integrates a Queued Serial Module (QSM) combining QSPI and SCI functionality in one peripheral block, enabling simultaneous synchronous and asynchronous serial communication without CPU intervention. The MCU lacks on-chip ROM (unlike Z2/Z3 variants) and relies on external program memory or bootloaders loaded into SRAM.

Key Specifications

Pinout & Package

MC68HC16Z1CAG16 is housed in a 112-pin Ceramic Quad Flat Package (CQFP) with 0.65 mm pitch, designed for high-reliability industrial and automotive environments. Pin assignments follow the standard M68HC16Z-series layout defined in Section 3.4 of the User's Manual.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68HC16Z2CAG16, the MC68HC16Z1CAG16 offers identical real-time control capability but requires external program memory; versus MC9328MX1CZK, it delivers lower power, deterministic timing, and simpler toolchain support at the expense of raw compute throughput and multimedia features.

Availability

MC68HC16Z1CAG16 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, medical infusion systems, and energy metering gateways requiring stable component supply and long-term lifecycle support.

Supply support for MC68HC16Z1CAG16 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 mixed-signal ICs for automotive, industrial, and networking markets.

The M68HC16Z series was developed as a high-integrity 16-bit MCU family targeting deterministic real-time control in safety-aware systems, with emphasis on debug visibility, low-power operation, and seamless migration from M68HC11 platforms.

FAQ

What is the maximum operating frequency of the MC68HC16Z1CAG16?

The MC68HC16Z1CAG16 is rated for a maximum external crystal or oscillator input frequency of 16 MHz, which directly drives the CPU16 core and determines instruction timing, bus cycle duration, and peripheral clock rates. This frequency is specified under commercial temperature range (0°C to +70°C) and 5.0 V ±10% supply conditions per the Freescale M68HC16Z Series User's Manual. Exceeding this limit may cause timing violations or undefined behavior.

Does the MC68HC16Z1CAG16 include on-chip program memory?

No, the MC68HC16Z1CAG16 does not contain on-chip ROM or flash memory. It belongs to the Z1 variant of the M68HC16Z series, which provides 16 KB of on-chip SRAM and 512 bytes of internal RAM but relies entirely on external memory (e.g., EPROM, Flash, or SRAM) for program storage. This distinguishes it from the Z2 and Z3 variants that integrate masked ROM.

How is debugging supported on the MC68HC16Z1CAG16?

The MC68HC16Z1CAG16 includes a dedicated Background Debug Mode (BDM) interface accessible via the BKGD pin. This allows non-intrusive debugging including breakpoint insertion, register and memory inspection, and single-stepping without requiring on-chip debug ROM or additional JTAG hardware. BDM operation is documented in Section 4.14 of the M68HC16Z Series User's Manual and requires a compatible BDM pod or debugger cable.

What serial communication peripherals are integrated into the MC68HC16Z1CAG16?

MC68HC16Z1CAG16 integrates a Queued Serial Module (QSM) comprising two independent serial subsystems: a Queued Serial Peripheral Interface (QSPI) supporting master/slave SPI protocols with hardware FIFOs, and a Serial Communication Interface (SCI) implementing full-duplex UART functionality. Both share common control registers and interrupt vectors but operate on separate pins and clock domains, enabling concurrent synchronous and asynchronous communication.

Is the MC68HC16Z1CAG16 pin-compatible with other members of the M68HC16Z family?

Yes, the MC68HC16Z1CAG16 is pin-compatible with MC68HC16Z2CAG16 and MC68HC16Z3CAG16 in the same 112-pin CQFP package. All share identical pin functions, electrical characteristics, and external bus interface signaling. Differences lie solely in internal memory configuration (Z1: SRAM-only; Z2/Z3: SRAM + ROM), making Z2/Z3 drop-in replacements where ROM-based firmware is acceptable.