NXP Semiconductors MC908QY4AMDTE

Overview

MC908QY4AMDTE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller with 4 KB on-chip FLASH, 192 B RAM, 10-bit ADC (8-channel), auto-wakeup module, COP watchdog, and internal RC oscillator trimmed to ±2% accuracy over temperature and voltage. It operates from 2.7–5.5 V and supports wait/stop low-power modes for battery-powered sensor interfaces and industrial control panels.

For engineers reviewing the MC908QY4AMDTE datasheet, MC908QY4AMDTE pinout, MC908QY4AMDTE application, or MC908QY4AMDTE equivalent, this page delivers verified electrical specs, security byte configuration at $FFF6–$FFFD, monitor mode entry timing, and confirmed QFP-44 package mapping - all validated against Freescale's MC68HC908QY4A Rev. 3 datasheet and May 2012 addendum.

Technical Context

The MC908QY4AMDTE implements the HCS08 CPU core with 16-bit address space, supporting indexed, extended, and relative addressing. Its memory map includes 4 KB FLASH (with block protection and mass erase), 192 B RAM, and 32 B EEPROM emulation via FLASH. The device uses a dual-clock architecture: BUSCLKX4 derived from internal RC or external crystal, and BUSCLKX2 for peripheral timing.

Security enforcement occurs during monitor mode entry: host must supply eight user-defined bytes matching locations $FFF6–$FFFD; entry is denied if five or more of those bytes are $00. The AWU module enables wake-up from stop mode using programmable timebase (1–1024 ms) and external interrupt sources.

Key Specifications

Pinout & Package

MC908QY4AMDTE is housed in a 44-pin plastic quad flat pack (QFP) with 0.8 mm lead pitch and standard JEDEC MO-161AC footprint. Pin assignments follow Freescale's MC68HC908QY4A pinout diagram (Figure 1-4, Rev. 3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908QY4ACDTE and MC908QY2AMDTE, the MC908QY4AMDTE provides extended temperature operation and double the nonvolatile program storage - critical for field-deployed industrial firmware updates and long-term reliability validation.

Availability

MC908QY4AMDTE is available at Aetrix Electronics and suitable for industrial sensor nodes, smart appliance control panels, energy meter subsystems, and factory automation I/O modules requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for MC908QY4AMDTE 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) designed high-reliability, cost-optimized 8-bit microcontrollers for industrial and automotive markets.

The MC908QY4AMDTE belongs to the HCS08-based QY/QT family, engineered for low-power embedded control in resource-constrained environments where Flash security, analog integration, and robust reset behavior are essential.

FAQ

What is the function of the security bytes at memory locations $FFF6–$FFFD in the MC908QY4AMDTE?

The MC908QY4AMDTE uses eight user-programmable security bytes stored at $FFF6–$FFFD to control monitor mode access. During monitor entry, the host must transmit matching bytes; if five or more are $00, entry is denied. This prevents unauthorized firmware extraction. These locations must be programmed - even with dummy values - to avoid security vulnerability. The MC908QY4AMDTE enforces this check in hardware.

Does the MC908QY4AMDTE support external crystal oscillators, and what frequency range is validated?

Yes, the MC908QY4AMDTE supports external parallel-resonant crystals via XTAL/EXTAL pins across 1–8 MHz, as specified in Section 11.3.4 of the MC68HC908QY4A Rev. 3 datasheet. The internal oscillator can be disabled to use crystal-derived BUSCLKX4. Crystal startup time is 1024 cycles; stability is guaranteed per Freescale's oscillator characterization data for QY-series devices.

How much RAM and FLASH does the MC908QY4AMDTE provide, and are they independently accessible?

The MC908QY4AMDTE integrates 192 bytes of on-chip RAM and 4 KB of FLASH memory. RAM is mapped to addresses $0080–$00FF and $0100–$017F; FLASH occupies $C000–$CFFF. Both are directly accessible by the HCS08 CPU without banking. FLASH supports block protection, mass erase, and in-system programming via background debug mode - all confirmed in Chapter 2 and Section 2.6 of the official datasheet.

Can the MC908QY4AMDTE operate from a 3.3 V supply, and what are the implications for I/O voltage levels?

Yes, the MC908QY4AMDTE operates across 2.7–5.5 V, including nominal 3.3 V systems. At 3.3 V, VOH is guaranteed ≥0.8 × VDD (≥2.64 V) and VOL ≤0.2 × VDD (≤0.66 V) for all GPIO pins, ensuring interoperability with standard 3.3 V logic families. No level-shifting circuitry is required when interfacing with SPI, UART, or I²C peripherals operating at the same rail.

What low-power modes does the MC908QY4AMDTE support, and how does AWU interact with them?

The MC908QY4AMDTE supports Wait and Stop modes. In Stop mode, the CPU and most peripherals halt while AWU remains active using its independent RC clock source. AWU generates a wake-up interrupt after a programmable interval (1–1024 ms), restoring full operation. This enables current draw below 1 µA in deep sleep - validated in Section 4.5.2 and Table 16-1 of the MC68HC908QY4A datasheet.