Microchip Technology AC244066

Overview

AC244066 from Microchip Technology is an Emulation Header designed for in-circuit debugging of PIC® microcontrollers with -ME2 silicon revision. It hosts a physical -ME2 device, provides real-time hardware instruction trace up to 32 MHz via TRCLK/TRDAT[6:0]/TRSTALL pins, supports 32 hardware address/data breakpoints, and enables runtime watches on symbols and SFRs when used with MPLAB® REAL ICE™ or ICD 3 debug tools. It is used during firmware development for automotive control modules requiring non-intrusive trace and advanced breakpoint logic.

For engineers reviewing the AC244066 datasheet, AC244066 pinout, AC244066 application, or AC244066 equivalent, this page delivers verified technical context, trace interface signal mapping, hardware breakpoint capabilities, target socket compatibility (TQFP/PLCC), and tool-specific feature support across MPLAB X IDE v1.90+ with REAL ICE, ICD 3, or PICkit 3.

Technical Context

The AC244066 Emulation Header integrates a Microchip -ME2 silicon variant with dedicated emulation circuitry, enabling background debug without consuming target I/O resources. It routes TRCLK, TRDAT[0–6], TRSTALL, TRGIN, and TRGOUT signals to support real-time instruction trace at up to 32 MHz - exclusively supported by MPLAB REAL ICE™.

It provides 32 shared data capture resources for hardware breakpoints and runtime watches, with mutually exclusive trace/watch operation. Breakpoint logic includes range matching, data value comparison, mask-based triggers, interrupt context detection, and event combiner support - all configurable via MPLAB X IDE's New Breakpoint dialog and Project Properties.

Key Specifications

Availability

AC244066 is available at Aetrix Electronics and suitable for embedded firmware validation, automotive ECU development, industrial motor control debugging, and academic MCU lab environments requiring stable component supply and full trace/debug feature access.

Supply support for AC244066 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

Microchip Technology Inc. is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and development tools, certified to ISO/TS-16949 and ISO 9001 standards.

The AC244066 belongs to Microchip's Emulation Header product line, engineered to extend debugging capability beyond on-chip debug interfaces by offloading emulation functions to a dedicated -ME2 device mounted on a replaceable header board.

FAQ

What is the primary function of the AC244066 Emulation Header?

The AC244066 Emulation Header serves as a physical interface between Microchip debug tools (REAL ICE, ICD 3, PICkit 3) and target PIC® microcontroller boards. It hosts a -ME2 silicon device with enhanced on-die emulation circuitry, enabling advanced debugging features - including real-time instruction trace, hardware breakpoints, and runtime watches - without occupying target I/O pins or internal debug resources. The AC244066 is not a standalone IC but a purpose-built hardware adapter for firmware development workflows.

Which debug tools fully support AC244066 trace functionality?

Only the MPLAB REAL ICE™ in-circuit emulator fully supports AC244066 trace functionality, including real-time hardware instruction trace up to 32 MHz using the TRCLK, TRDAT[0–6], and TRSTALL signals. MPLAB ICD 3 and PICkit 3 support basic debugging (breakpoints, watches) but do not support trace - a limitation confirmed in Table 2-1 of DS50002243B. Using AC244066 with REAL ICE requires the included trace cable and interface board for signal routing.

Can AC244066 be used to program production devices?

No, AC244066 is strictly a debugging aid and cannot be used to program production devices. It is designed for Debug > Debug Project mode in MPLAB X IDE only. Programming of standard (non--ME2) devices must be performed using dedicated programmers such as the MPLAB PM3, PICkit 3 in programmer mode, or the Universal Programming Module (AC162049). The -ME2 device on the AC244066 is factory-configured for emulation and lacks production-programming capability.

What target package types does AC244066 support?

The AC244066 supports TQFP and PLCC target footprints as documented in Appendix B of DS50002243B. Its bottom-side socket matches the pin count of the selected target device, while the top-mounted -ME2 device has additional pins dedicated to debug signaling. DIP footprints are supported by other headers in the same family (e.g., AC244055), but AC244066 is explicitly listed in Section 3.6 for TQFP/PLCC applications.

Does AC244066 require special setup in MPLAB X IDE?

Yes, AC244066 requires explicit configuration in MPLAB X IDE v1.90+. During project creation, users must select the AC244066 part number in the Projects wizard and specify the attached debug tool (REAL ICE, ICD 3, or PICkit 3). Trace functionality further requires enabling "Instruction Trace/Profiling" under Real ICE > Trace and Profiling options and setting correct clock speed in the Clock category. Failure to configure these settings results in disabled trace or runtime watch features.