NXP Semiconductors MC705P6ECPE

Overview

MC705P6ECPE from Freescale Semiconductor is an EPROM-based 8-bit microcontroller in the M68HC05 family, featuring a 16-bit timer with input capture/output compare, 4-channel 8-bit ADC, SIOP serial interface, COP watchdog, 4672 bytes of user EPROM, 176 bytes RAM, and 21 I/O pins (20 bidirectional + 1 input-only). It targets embedded control in industrial sensors, motor drives, and appliance subsystems requiring low-cost, single-chip timing and analog acquisition.

For engineers reviewing the MC705P6ECPE datasheet, MC705P6ECPE pinout, MC705P6ECPE application, or MC705P6ECPE equivalent, this page delivers verified electrical specs, package mapping to 28-pin PDIP, functional pin roles, bootloader ROM integration, and direct alternatives for legacy design continuity and drop-in replacement evaluation.

Technical Context

The MC705P6ECPE implements the M68HC05 CPU core with static logic, executing instructions at up to 2 MHz bus clock (f_op = f_osc/2). Its memory architecture integrates 4672 bytes of user EPROM, 239 bytes of masked bootloader ROM, and 176 bytes of on-chip RAM - all mapped in a fixed linear address space supporting both user and bootloader modes.

Peripheral subsystems include a 4-channel 8-bit ratiometric ADC with VREFH reference input, a 16-bit timer supporting input capture (TCAP), output compare (TCMP), and overflow interrupts, and a synchronous SIOP port configurable for MSB/LSB-first transmission at OSC/8–OSC/64 rates. Power management includes STOP, HALT, and WAIT modes controlled via MOR bits.

Key Specifications

Pinout & Package

MC705P6ECPE is housed in a 28-pin Plastic Dual In-Line Package (PDIP), Case 710, with 0.600-inch body width and 0.100-inch lead pitch. Pin 1 is marked by a notch or dot; pins are numbered counter-clockwise from pin 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68HC705P6A and MC68HC705P6M, MC705P6ECPE provides full EPROM programmability with integrated bootloader - enabling iterative development, field firmware updates, and secure production programming without external hardware programmers.

Availability

MC705P6ECPE is available at Aetrix Electronics and suitable for industrial motor control, appliance user interfaces, and embedded sensor nodes requiring stable component supply across extended product lifecycles.

Supply support for MC705P6ECPE 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 global leader in embedded processing, delivering scalable microcontrollers, analog, and connectivity solutions for automotive, industrial, and consumer markets.

The MC705P6ECPE belongs to the M68HC05 microcontroller family, designed specifically for cost-sensitive, low-power embedded control applications requiring integrated analog acquisition, timing, and serial communication in a single chip.

FAQ

What is the maximum operating frequency of the MC705P6ECPE?

The MC705P6ECPE supports an oscillator frequency up to 4 MHz, yielding a 2 MHz internal bus clock (f_op = f_osc/2). This timing governs instruction execution speed, ADC conversion rate, and SIOP baud generation. All electrical specifications in Chapter 14 of the datasheet assume operation within this 0–2 MHz bus clock range under 5.0 V ±10% supply conditions.

Does the MC705P6ECPE support in-system programming?

Yes, the MC705P6ECPE includes 239 bytes of masked bootloader ROM that enables in-system programming via its SIOP serial interface. Using the bootloader, users can reprogram the 4672-byte EPROM array without removing the device from the circuit board or using external EPROM programmers - provided the MOR security lockout bit is not set.

What are the key differences between MC705P6ECPE and MC68HC705P6A?

MC705P6ECPE and MC68HC705P6A refer to the identical silicon device. MC705P6ECPE is Freescale's standardized orderable part number for the 28-pin PDIP version with EPROM; MC68HC705P6A appears in early documentation as the base type designation. Both share identical pinout, memory map, peripherals, and electrical behavior - no functional or timing differences exist between them.

How is the ADC reference voltage configured on the MC705P6ECPE?

The MC705P6ECPE uses a ratiometric ADC architecture where the reference voltage (VREFH) is applied externally to pin PC7. The 8-bit conversion result is proportional to V_IN/VREFH, making it insensitive to supply voltage variation when VREFH is derived from the same source as the analog sensor. This eliminates need for precision voltage references in many sensor interface designs.

Can the MC705P6ECPE operate in low-power modes without losing RAM contents?

Yes, the MC705P6ECPE retains full RAM and register contents in HALT and WAIT modes. In STOP mode, RAM is preserved but the CPU, clocks, and most peripherals are disabled - drawing less than 10 µA typical. Recovery from all three modes occurs via RESET, IRQ, or wake-up events (e.g., TCAP edge), ensuring deterministic restart behavior critical for battery-powered and safety-critical applications.