NXP Semiconductors MC908QY1AMDWER

Overview

MC908QY1AMDWER from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08-core microcontroller with 4 KB Flash, 192 B RAM, and integrated ADC10, AWU, COP watchdog, and LVI voltage monitor. It operates at up to 8 MHz bus frequency, supports 2.7–5.5 V supply, and targets low-power industrial sensor nodes and appliance control. The device includes on-chip oscillator trimming and flash security via $FFF6–$FFFD byte matching.

For engineers reviewing the MC908QY1AMDWER datasheet, MC908QY1AMDWER pinout, MC908QY1AMDWER application, or MC908QY1AMDWER equivalent, key selection criteria include its 16-pin SOIC-W package, internal RC oscillator accuracy (±2% after trimming), 10-bit ADC with 8-channel input multiplexing, flash security implementation, and compatibility with legacy HC08 development tools including P&E Multilink and CodeWarrior IDE.

Technical Context

The MC908QY1AMDWER implements the HCS08 CPU core with 16-bit address space, supporting indexed, extended, and relative addressing modes. Its memory map includes 4 KB of on-chip SuperFlash® (licensed from SST), 192 B RAM, and 32 B EEPROM emulation via flash wear-leveling.

Peripherals include a 10-bit successive-approximation ADC with programmable sample time and conversion trigger sources (software, timer, or external edge); Auto Wakeup Module with selectable 1–1024 ms timeout intervals; and Computer Operating Properly (COP) watchdog with 16 selectable timeout periods ranging from 2.1 ms to 1.4 s.

Key Specifications

Pinout & Package

MC908QY1AMDWER is housed in a 16-pin SOIC-W (wide-body) package with 0.65 mm lead pitch and 5.3 mm body width. Thermal resistance θ_JA is 100°C/W under standard JEDEC 2S2P conditions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908QY1AMDWER, the MC908QY2AMDWER offers double flash and RAM in identical packaging for seamless firmware growth, while the S9KEAZ128AMLH delivers architectural modernization and expanded connectivity at the cost of PCB redesign and toolchain migration.

Availability

MC908QY1AMDWER is available at Aetrix Electronics and suitable for industrial motor control panels, smart thermostat sensor nodes, white goods appliance timers, and legacy PLC I/O expanders requiring stable component supply and long-term manufacturing continuity.

Supply support for MC908QY1AMDWER 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 company formed from the spin-off of Philips' semiconductor division, now specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The MC908QY1AMDWER belongs to the legacy HCS08 microcontroller family designed for cost-sensitive, low-power embedded control applications where proven reliability, minimal BOM count, and long product lifecycle are critical.

FAQ

What is the maximum bus clock frequency supported by the MC908QY1AMDWER?

The MC908QY1AMDWER supports a maximum bus clock frequency of 8 MHz. This is derived from its internal oscillator (trimmed RC or crystal source) divided by the prescaler setting in the configuration register. At 8 MHz bus clock, the ADC achieves 16 µs typical conversion time, and instruction execution reaches ~2 million instructions per second (MIPS) for average code.

Does the MC908QY1AMDWER include hardware support for UART communication?

Yes, the MC908QY1AMDWER includes a built-in Serial Communication Interface (SCI) module that supports asynchronous full-duplex UART operation. Pins PA4 (TXD) and PA5 (RXD) serve as dedicated SCI I/O. The module features programmable baud rate generation, framing error detection, and break detection - enabling robust serial communication without external UART ICs.

How does the flash security feature work on the MC908QY1AMDWER?

The MC908QY1AMDWER implements flash security by requiring an eight-byte unlock sequence stored at memory addresses $FFF6–$FFFD to enter monitor mode. If five or more of those bytes are zero, monitor mode entry is denied. This prevents unauthorized firmware extraction during debugging. Users must program these locations - even with dummy values - to ensure security integrity.

Can the MC908QY1AMDWER operate from a 3.3 V supply?

Yes, the MC908QY1AMDWER operates across a 2.7–5.5 V supply range, making it fully compatible with 3.3 V systems. At 3.3 V, the internal RC oscillator maintains ±2% accuracy after trimming, and all I/O pins are 5 V tolerant - allowing direct interfacing with both 3.3 V and 5 V peripherals without level-shifting circuitry.

What low-power modes are available on the MC908QY1AMDWER?

The MC908QY1AMDWER supports Wait and Stop low-power modes. In Wait mode, the CPU halts but peripherals (ADC, AWU, SCI) remain active; current draw is ~100 µA at 3.3 V. In Stop mode, all clocks stop except the AWU's RC oscillator; current drops to ~1 µA. Both modes retain RAM contents and support wake via IRQ, KBI, or AWU timeout.