The PIC16F716 is a specialized 8-bit microcontroller ( MCU ) celebrated for its hardened PWM module and 28-pin compact architecture, featuring 3.5KB of flash program memory and 128 bytes of EEPROM. Unlike general-purpose chips, this microprocessor is deeply embedded in closed-loop motor controls, brushless DC fans, automotive power windows, and industrial solenoid drivers. Its protected status often relies on locked configuration bits that prevent external readout of the binary file. However, when the original source code is lost after a decade of service, or when a malfunctioning unit needs security auditing, the legitimate owner faces a barrier: the secured memory holds calibration maps and timing loops that cannot be recreated from scratch. To extract IC code legally is not an act of theft—it is an act of system restore and preservation.

The PIC16F7X devices have a 13-bit program counter capable of addressing an 8K word x 14-bit program memory space. The PIC16F716 devices have 8K words of FLASH program memory and the PIC16F716 devices have 4K words. The program memory maps for PIC16F7X devices are shown in Figure 2-1. Accessing a location above the physically implemented address will cause a wraparound.

The challenge of trying to open a locked PIC16F716 lies in its layered protective design. Simple read commands return only zeros because the secured bit triggers a hardware memory firewall. Our reverse engineering approach begins with low-level glitching to temporarily suspend this guard, allowing us to dump the raw heximal content from flash and EEPROM regions. Unlike flash-only chips, the EEPROM archive often stores unique device IDs and trimming values—losing them means losing field calibration. We then restore the firmware into an organized binary file, preserving interrupt vectors and configuration words. The goal is to recover every data byte without corrupting the protected segments. This process requires patience, as the microcontroller will self-destruct if probed incorrectly; we do not reveal the full hack methodology, but we guarantee a clean extract that leaves the chip’s memory intact for future duplication.

The RESET Vector is at 0000h and the Interrupt Vector is at 0004h. The Data Memory is partitioned into multiple banks, which contain the General Purpose Registers and the Special Function Registers. Bits RP1 (STATUS<6>) and RP0 (STATUS<5>) are the bank select bits: Each bank extends up to 7Fh (128 bytes). The lower locations of each bank are reserved for the Special Function Registers. Above the Special Function Registers are General Purpose Registers, implemented as static RAM. All implemented banks contain Special Function Registers.

Consider an automotive power liftgate controller based on the PIC16F716. The secured program contains non-linear PWM ramping tables developed over two years. When the supplier went bankrupt, the automaker had no source code archive and 50,000 vehicles still on warranty. Our ability to recover the binary from a single working unit enabled ethical reverse engineering to produce replacement chips. Similarly, an industrial pump manufacturer discovered that their encrypted firmware had a hidden timing bug causing intermittent jams. By allowing us to open and dump the flash, they could debug without the original compiler. The meaning is simple: extract IC code to break vendor lock-in and regain control over legacy hardware.

Some frequently used Special Function Registers from one bank may be mirrored in another bank for code reduction and quicker access. The register file (shown in Figure 2-2 and Figure 2-3) can be accessed either directly, or indirectly, through the File Select Register FSR. The Special Function Registers are registers used by the CPU and peripheral modules for controlling the desired operation of the device. These registers are implemented as static RAM. The Special Function Registers can be classified into two sets: core (CPU) and peripheral. Those registers associated with the core functions are described in detail in this section. Those related to the operation of the peripheral features are described in detail in the peripheral feature section.

Ultimately, our service transforms a locked microcontroller into a usable file archive. Clients receive a complete heximal dump of flash and EEPROM, a disassembled source code approximation, and a verified binary ready for programming onto new MCUs. This allows you to restore production lines, recover from hardware obsolescence, and perform security audits without reverse engineering from scratch. Unlike generic services that deliver corrupted data, we guarantee bit-perfect extract ion of every protected region. Whether you need to hack your own legacy product or simply open a decades-old secured chip, our reverse engineering process turns an impossible situation into a documented, reusable archive. Keep your systems running, not trapped.