NXP Semiconductors MC705P6AMDWE

Overview

MC705P6AMDWE from Freescale Semiconductor is an EPROM-based 8-bit microcontroller in the M68HC05 family, featuring a 16-bit timer with input capture and output compare, 4-channel 8-bit A/D converter, SIOP serial interface, COP watchdog timer, 4672 bytes of user EPROM, 176 bytes of RAM, and 21 I/O pins (20 bidirectional + 1 input-only) - used in embedded control systems requiring low-cost, single-chip sensor interfacing and timing functions.

For engineers reviewing the MC705P6AMDWE datasheet, MC705P6AMDWE pinout, MC705P6AMDWE application, or MC705P6AMDWE equivalent, key selection considerations include its 28-pin SOIC package, 5 V operation, mask-programmable options (COP enable/disable, IRQ sensitivity, SIOP bit order), EPROM security lockout, and bootloader ROM support for field programming.

Technical Context

The MC705P6AMDWE implements the M68HC05 CPU core with static logic, supporting inherent, immediate, direct, extended, and indexed addressing modes. Its 16-bit timer supports both input capture (for pulse width/frequency measurement) and output compare (for PWM generation or timed interrupts), with dedicated TCAP and TCMP pins.

The analog subsystem integrates a ratiometric 4-channel 8-bit ADC using internal reference (VREFH) and supports multi-channel conversion with programmable sample times. SIOP operates in master/slave mode with configurable clock division (OSC/8 to OSC/64) and MSB/LSB-first data ordering, controlled via mask option register (MOR) settings.

Key Specifications

Pinout & Package

MC705P6AMDWE is housed in a 28-pin Small Outline Integrated Circuit (SOIC) package per Freescale Case 751F mechanical specification, with 1.27 mm pitch, 7.6 mm body width, and gull-wing leads suitable for automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68HC705P6ACDWE and MC68HC705P6AMDW, the MC705P6AMDWE provides industrial-temperature reliability in a space-saving SOIC package - critical for automotive under-hood modules and industrial controllers where thermal stability and board area are constrained.

Availability

MC705P6AMDWE is available at Aetrix Electronics and suitable for industrial sensor nodes, appliance motor control, energy meter front-ends, and legacy automotive body controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC705P6AMDWE 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 mixed-signal ICs for automotive, industrial, and consumer markets.

The MC68HC705P6A product line was designed for cost-sensitive, low-pin-count embedded control applications requiring integrated A/D, timer, and serial interfaces - targeting white goods, instrumentation, and legacy automotive subsystems.

FAQ

What is the maximum operating frequency of the MC705P6AMDWE?

The MC705P6AMDWE supports an oscillator frequency up to 4 MHz, yielding a 2 MHz internal bus clock (f_op = f_osc/2). This is confirmed in Chapter 14 Electrical Specifications of the Advance Information Data Sheet, where AC timing parameters are characterized at 4 MHz oscillator input. Operation beyond this frequency risks timing violations in instruction execution and peripheral synchronization.

Does the MC705P6AMDWE support in-circuit programming after soldering?

No, the MC705P6AMDWE does not support in-circuit programming. It uses EPROM memory programmed during manufacturing via UV erasure and high-voltage (12.5 V) parallel programming at the VPP/IRQ pin. Field updates require removal, UV erasure, and reprogramming in a dedicated EPROM programmer - unlike flash-based successors.

How is the analog reference voltage configured on the MC705P6AMDWE?

The MC705P6AMDWE uses a ratiometric A/D subsystem where the reference voltage is applied externally to the PC7/VREFH pin. The ADC result is proportional to V_IN/V_REFH, enabling accurate measurements independent of supply variation. VREFH must be stable and within 1.5 V to VDD; it is not internally generated or buffered.

Can the SIOP interface of the MC705P6AMDWE operate as a SPI master?

Yes, the SIOP interface can function as an SPI master by configuring SCK as output, SDO as output, and SDI as input - matching standard SPI signal roles. Clock polarity and phase are fixed (CPOL = 0, CPHA = 0), and bit order (MSB/LSB first) is set via the mask option register (MOR), making it interoperable with common SPI peripherals.

What happens to the timer during STOP mode on the MC705P6AMDWE?

During STOP mode, the MC705P6AMDWE halts the main oscillator and disables the CPU clock, freezing the 16-bit timer counter. Input capture and output compare functions remain inactive until exit from STOP mode and oscillator restart. Timer operation resumes only after the wake-up sequence completes and the bus clock is restored.