NXP Semiconductors MCHLC908QT4DWE

Overview

MCHLC908QT4DWE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller with 4 KB on-chip FLASH, 192 B RAM, and integrated 8-channel 8-bit ADC. It operates at up to 8 MHz bus frequency using internal or external clock sources and supports STOP/WAIT low-power modes. Designed for cost-sensitive embedded control in appliance motor drives and industrial sensor interfaces.

For engineers reviewing the MCHLC908QT4DWE datasheet, MCHLC908QT4DWE pinout, MCHLC908QT4DWE application, or MCHLC908QT4DWE equivalent, key selection criteria include FLASH endurance (100k erase/write cycles), internal oscillator accuracy (±2% over temperature), COP watchdog timeout range (1.5–32 ms), and compatibility with Freescale's MON08 debug interface.

Technical Context

The MCHLC908QT4DWE implements the M68HC08 CPU core with 16-bit address space, indexed addressing, and 72-instruction set including WAIT/STOP. Its memory map includes 4 KB FLASH (block-erasable), 192 B RAM, and 128 B EEPROM-equivalent data storage via FLASH emulation.

Peripheral integration includes a 4-channel KBI for matrix keypad scanning, Auto Wakeup Module with programmable sleep intervals, LVI reset threshold at 2.5 V ±0.1 V, and System Integration Module managing bus clock generation, reset sequencing, and interrupt prioritization across IRQ, KBI, ADC, and TIM sources.

Key Specifications

Pinout & Package

Package: 20-pin SOIC (Small Outline Integrated Circuit), 0.300-inch body width, JEDEC MS-013AC standard.

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 MCHLC908QT4DWE provides broader voltage range (2.7–5.5 V), integrated oscillator trimming, and dedicated KBI/AWU hardware - making it optimal for 5 V legacy industrial controls requiring robust keypad and wake-up functionality without external timing components.

Availability

MCHLC908QT4DWE is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, smart power outlets, and motorized window actuators requiring stable component supply across multi-year production cycles.

Supply support for MCHLC908QT4DWE 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) is a fabless semiconductor company specializing in microcontrollers, analog, and connectivity solutions for automotive, industrial, and consumer markets.

The MCHLC908QT4DWE belongs to the HC08 family, designed for cost-effective, low-pin-count embedded control in appliances, power tools, and building automation where 5 V operation, FLASH reprogrammability, and integrated peripherals reduce BOM count.

FAQ

What is the maximum operating frequency of the MCHLC908QT4DWE?

The MCHLC908QT4DWE supports a maximum bus frequency of 8 MHz. This is achieved using the internal oscillator (trimmed to ±2% accuracy) or an external crystal/RC source. The CPU executes instructions at this bus speed, with most instructions completing in 1–3 bus cycles. The MCHLC908QT4DWE datasheet specifies timing parameters for all peripheral modules-including ADC conversion and COP timeout-based on this 8 MHz maximum.

Does the MCHLC908QT4DWE support in-circuit debugging?

Yes, the MCHLC908QT4DWE supports MON08 background debug mode via the MONI/MONR pins. This allows non-intrusive program download, breakpoint setting, and register inspection without halting real-time peripheral operation. The MCHLC908QT4DWE requires no additional debug hardware beyond a simple level-shifter interface to a host PC, and its debug ROM is factory-programmed and always enabled.

How many I/O pins does the MCHLC908QT4DWE provide?

The MCHLC908QT4DWE provides 16 general-purpose I/O pins: PTA0–PTA3 (4 pins), PTB0–PTB3 (4 pins), and PTA5–PTA7 plus PTB4–PTB7 (8 pins). All are individually configurable as input or output with optional weak pull-ups. Eight of these (PTA0–PTA3, PTB0–PTB3) support keyboard interrupt functionality, and PTB3 doubles as the IRQ input. The MCHLC908QT4DWE pinout confirms no dedicated analog-only pins - ADC inputs share I/O functions.

What is the FLASH endurance rating for the MCHLC908QT4DWE?

The MCHLC908QT4DWE features 4 KB of on-chip FLASH memory rated for 100,000 erase/write cycles per block. Endurance is guaranteed under specified operating conditions (2.7–5.5 V, –40°C to +85°C). The FLBPR register allows locking the top 512-byte block to protect boot code from accidental overwrite. The MCHLC908QT4DWE datasheet documents full erase and program timing, including mass erase (≤100 ms) and page erase (≤10 ms) durations.

Can the MCHLC908QT4DWE operate from a single 3.3 V supply?

Yes, the MCHLC908QT4DWE operates across a 2.7–5.5 V supply range, fully supporting 3.3 V nominal systems. At 3.3 V, the internal oscillator maintains ±2% accuracy over temperature, and all I/O pins are 5 V tolerant - allowing direct interfacing with 5 V peripherals without level shifters. The MCHLC908QT4DWE electrical specifications table confirms DC parameters (e.g., VOL ≤0.2 V, VOH ≥VDD–0.4 V) are validated at 3.3 V, ensuring reliable digital communication in mixed-voltage designs.