NXP Semiconductors MCHC908QT1CDWER

Overview

MCHC908QT1CDWER from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08-core microcontroller with 1 KB FLASH, 64 bytes RAM, and integrated 8-channel 8-bit ADC. It operates at up to 8 MHz bus frequency using internal RC oscillator or external crystal, supports WAIT/STOP low-power modes, and targets cost-sensitive embedded control in industrial sensors and appliance subsystems.

For engineers reviewing the MCHC908QT1CDWER datasheet, MCHC908QT1CDWER pinout, MCHC908QT1CDWER application, or MCHC908QT1CDWER equivalent, key selection criteria include its 8-pin SOIC-W package, internal oscillator trim capability, keyboard interrupt support, and compatibility with legacy HC08 development tools and debug interfaces.

Technical Context

The MCHC908QT1CDWER implements the HCS08 CPU core with 16-bit address space, supporting indexed, extended, and relative addressing. Its memory map includes 1 KB of on-chip FLASH (with block protection), 64 bytes of RAM, and dedicated I/O register space mapped to $0000–$00FF.

Peripherals include an 8-channel 8-bit ADC with programmable conversion clock prescaler, Auto Wakeup Module (AWU) with selectable timebase (1–128 ms), Keyboard Interrupt Module (KBI) for 4-key matrix scanning, and Low-Voltage Inhibit (LVI) with user-selectable trip points (3.8 V or 4.2 V).

Key Specifications

Pinout & Package

Package: 8-pin SOIC-W (Wide-body), 3.9 mm × 4.9 mm body, 1.27 mm pitch, RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9RS08KA2CSC and MC9S08QG4CDTE, the MCHC908QT1CDWER provides optimal balance of ultra-low pin count, integrated KBI, and proven field reliability for simple UI and sensing tasks where minimal BOM and legacy toolchain continuity are critical.

Availability

MCHC908QT1CDWER is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control panels, and smart meter subsystems requiring stable component supply across long product lifecycles.

Supply support for MCHC908QT1CDWER 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, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The MCHC908QT1CDWER belongs to the legacy HCS08 microcontroller family designed for cost-sensitive, low-pin-count embedded control applications where robustness, low power, and toolchain longevity outweigh raw performance needs.

FAQ

What is the maximum operating frequency of the MCHC908QT1CDWER?

The MCHC908QT1CDWER supports a maximum bus frequency of 8 MHz. This is achieved either via its internal trimmed RC oscillator (factory calibrated to 4 MHz ±2%, doubled internally) or through an external crystal/resonator connected to OSC1/OSC2 pins. The actual achievable frequency depends on supply voltage and temperature but remains within specification across the full 2.7–5.5 V and –40°C to +85°C operating range.

Does the MCHC908QT1CDWER support in-circuit debugging?

Yes, the MCHC908QT1CDWER supports monitor-mode debugging via the single-wire background debug interface (BDM). This allows full read/write access to memory and registers, real-time breakpoint insertion, and flash programming without requiring dedicated debug pins - only RESET and VDD are needed for connection to compatible debug probes like the P&E Multilink or NXP DEMO9S08QG8.

Can the MCHC908QT1CDWER operate from a 3.3 V supply?

Yes, the MCHC908QT1CDWER is fully specified for operation from 2.7 V to 5.5 V, making it compatible with standard 3.3 V logic systems. All I/O pins are 5 V tolerant when configured as inputs, and the internal oscillator remains stable across this voltage range. No level-shifting circuitry is required for interfacing with 3.3 V peripherals.

How is FLASH memory protected against accidental overwrite on the MCHC908QT1CDWER?

FLASH protection on the MCHC908QT1CDWER is implemented via the FLASH Block Protect Register (FLBPR) located at memory address $FFBE. Writing a specific unlock sequence followed by setting FLBPR bits disables write and erase operations on the top 64-byte block containing the reset vector and interrupt vectors - preventing corruption of critical startup code during field firmware updates.

What peripheral modules are included in the MCHC908QT1CDWER?

The MCHC908QT1CDWER integrates an 8-channel 8-bit ADC, Auto Wakeup Module (AWU), Keyboard Interrupt Module (KBI), Low-Voltage Inhibit (LVI), Computer Operating Properly (COP) watchdog, and System Integration Module (SIM) with reset and clock control. It lacks UART, SPI, or I²C - those functions require bit-banging or external components.