AVR16EB32 datasheet(38/46 Pages) MICROCHIP

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AVR16EB32 Curiosity Nano

Appendix

User Guide

DS50003605B - 38

6.4.3

Connecting to External Microcontrollers

The figure and table below show where to connect the programming and debugging signals to

program and debug external microcontrollers. The on-board debugger can supply power to the

external hardware or use an external voltage reference for its level shifters. Read more about the

power supply in Power Supply.

The on-board debugger and level shifters actively drive data and clock signals used for

programming and debugging (DBG0, DBG1, and DBG2). Pull-down resistors are required on the

ICSP™ data and clock signals to debug PIC® microcontrollers. All other interfaces are functional with

or without pull-up or pull-down resistors.

DBG3 is an open-drain connection and requires a pull-up resistor to function.

Remember:

• Connect GND and VTG to the external microcontroller

• Tie the VOFF pin to GND if the external hardware has a power supply

• Make sure there are pull-down resistors on the ICSP data and clock signals

(DBG0 and DBG1) to support the debugging of PIC microcontrollers

Figure 6-7. Curiosity Nano Standard Pinout

USB

DEBUGGER

PS LED

CDC RX

CDC TX

DBG1

DBG2

VBUS

VOFF

DBG3

DBG0

GND

VTG

CURIOSITY NANO

Table 6-1. Programming and Debugging Interfaces

Curiosity Nano Pin

UPDI

ICSP™

SWD

DBG0

UPDI

DATA

SWDIO

DBG1

—

CLK

SWCLK

DBG2

—

DBG3

—

MCLR

RESET

6.5

Connecting External Debuggers

Even though there is an on-board debugger, external debuggers can be connected directly to the

AVR16EB32 Curiosity Nano to program/debug the AVR16EB32. When not actively used, the on-board

debugger keeps all the pins connected to the AVR16EB32 and board edge in tri-state. Therefore, the

on-board debugger will not interfere with any external debug tools.

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