NXP Semiconductors MC908QY8CDWER

Overview

MC908QY8CDWER from NXP Semiconductors (formerly Freescale) is an 8-bit M68HC08 core microcontroller with 8 KB on-chip FLASH, 256 B RAM, and integrated ADC10, ESCI, SPI, TIM, AWU, and COP modules. It operates at up to 8 MHz bus frequency, supports 5 V operation, and targets low-cost embedded control in automotive body electronics and industrial sensors.

For engineers reviewing the MC908QY8CDWER datasheet, MC908QY8CDWER pinout, MC908QY8CDWER application, or MC908QY8CDWER equivalent, this page delivers verified technical context, package mapping, security byte configuration requirements, and validated alternative options for legacy design continuity and replacement sourcing.

Technical Context

The MC908QY8CDWER implements the M68HC08 CPU core with 16-bit address space, Harvard architecture memory organization, and a 4-stage instruction pipeline. It integrates a 10-bit successive-approximation ADC with 8 input channels, programmable sample time, and auto-triggering via TIM or AWU.

Its development support includes monitor mode entry requiring eight user-defined security bytes at $FFF6–$FFFD; entry is denied if five or more are zero. The device uses internal RC or external crystal oscillator sources, with BUSCLKX4 and BUSCLKX2 derived clocks feeding peripheral modules including ESCI (LIN-capable), SPI, and 16-bit TIM with input capture/output compare.

Key Specifications

Pinout & Package

MC908QY8CDWER is housed in a 32-pin LQFP (7 mm × 7 mm, 0.8 mm pitch) package with exposed thermal pad. Pin functions include dedicated OSC1/OSC2, RESET, IRQ, KBI inputs, ADC channel pins (AD0–AD7), and dual-function port pins supporting serial interfaces (ESCI, SPI) and timer I/O.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with MC908QY8CDWER, MC908QY4CDWER offers identical footprint and legacy compatibility at lower memory capacity, while S9KEAZ128AMLH provides architectural modernization and scalability at the cost of layout change and toolchain migration.

Availability

MC908QY8CDWER is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, home appliance timers, and legacy industrial HMI requiring stable component supply across long-life production cycles.

Supply support for MC908QY8CDWER 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 is a global semiconductor leader delivering secure, energy-efficient, and scalable solutions for automotive, industrial, IoT, and communication infrastructure markets.

The MC908QY8CDWER belongs to the legacy M68HC08 microcontroller family, designed for cost-sensitive, low-power embedded control applications where deterministic real-time response and long-term supply stability are critical.

FAQ

What is the function of the security bytes at memory locations $FFF6–$FFFD in the MC908QY8CDWER?

The MC908QY8CDWER uses eight user-programmable security bytes stored at $FFF6–$FFFD to control access to monitor mode. During monitor entry, the host must send a matching 8-byte sequence; if five or more bytes are $00, monitor mode is denied. This prevents unauthorized FLASH readout and protects firmware intellectual property. These locations must be programmed - even with dummy values - to ensure security enforcement.

Does the MC908QY8CDWER support LIN bus communication?

Yes, the MC908QY8CDWER supports LIN 1.3 communication through its Enhanced Serial Communications Interface (ESCI) module. The ESCI implements LIN-specific features including break detection, sync field generation, and configurable baud rate via the ESCIBDSRC register. It requires no external transceiver for basic LIN master/slave operation when paired with appropriate level-shifting circuitry.

What is the maximum operating frequency of the MC908QY8CDWER?

The MC908QY8CDWER supports a maximum bus frequency of 8 MHz, derived from either its internal RC oscillator (calibrated to ±2% over temperature) or an external crystal/resonator (1–8 MHz). The internal oscillator can be trimmed using the ICSTRM register, and BUSCLKX4/BUSCLKX2 signals are generated for peripheral clocking, enabling precise timing control for ADC, TIM, and ESCI modules.

How does the Auto Wakeup Module (AWU) operate in Stop mode on the MC908QY8CDWER?

In Stop mode, the MC908QY8CDWER's AWU uses a free-running 1 kHz internal RC oscillator or an external clock source to generate wakeup interrupts at intervals from 1 to 65536 bus clock periods. Upon timeout, it asserts the AWU interrupt flag and exits Stop mode, restoring full CPU operation. This enables ultra-low-power periodic sensing without external real-time clock hardware.

Can the MC908QY8CDWER be used as a direct replacement for the MC68HC908QB8?

No, the MC908QY8CDWER is not a pin-compatible or functional drop-in replacement for the MC68HC908QB8. While both belong to the M68HC08 family and share core architecture, they differ in pin count (32 vs. 28), FLASH size (8 KB vs. 8 KB), I/O count, and peripheral register maps. The MC908QY8CDWER adds ESCI and expands ADC channel count, requiring validation of signal routing, firmware initialization, and timing margins before substitution.