User Guide

MPLAB

PICkit™ 4 User’s Guide

DS50002751C-page 62  2018 Microchip Technology Inc.

B.3 COMMUNICATION HARDWARE

For standard debugger communication with a target (see Section 2.2 “Debugger to

Target Communication” and “Standard ICSP™ Device Communication“), either directly

connect the MPLAB PICkit 4 debugger directly to the target or use a header if needed.

The debugger has an 8-pin SIL connector. If the target has a 6-pin connector, make

sure to align the Pin 1 appropriately.

B.3.1 Standard Communication

The main interface to the target processor is via standard communication. It contains

the connections to the high voltage (V

PP), VDD sense lines, and clock and data

connections that are required for programming and connecting with the target devices.

The V

PP high-voltage lines can produce a variable voltage that can swing from 0-14V

to satisfy the voltage requirements of the specific emulation processor.

The V

DD sense connection draws current from the target processor. The actual power

comes from the MPLAB PICkit 4 In-Circuit Debugger system, as the Vdd sense line is

used as a reference only to track the target voltage.

The clock and data connections are interfaces with the following characteristics:

• Clock and data signals are in high-impedance mode (even when no power is

applied to the MPLAB PICkit 4 In-Circuit Debugger system).

• Clock and data signals are protected from high voltages caused by faulty targets

systems, or improper connections.

• Clock and data signals are protected from high current caused from electrical

shorts in prototype or target systems.

TABLE B-3: BOOTLOADER ERROR DESCRIPTIONS

Bootloader Errors Description

Red, slow blink Problem accessing the debugger’s serial EEPROM

Red, fast blink Bootloader API commands cannot be processed

White, fast blink A runtime exception occurred in the tool firmware

TABLE B-4: ELECTRICAL LOGIC TABLE

Logic Inputs VIH = VDD x 0.7V (min.)

IL = VDD x 0.3V (max.)

Logic Outputs V

DD = 5V VDD = 3V VDD = 2.3V VDD = 1.4V

OH = 3.8V min. VOH = 2.4V min. VOH = 1.9V min. VOH = 1.0V min.

VOL = 0.55V max. VOL = 0.55V max. VOL = 0.3V max. VOL = 0.1V max.