NRF9160-SICA-R7 datasheet(369/400 Pages) NORDIC

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9 Debug and trace

9.1 Overview

The debug and trace system offers a flexible and powerful mechanism for non-intrusive debugging.

DAP

CPU

ARM Cortex-M33

SWDCLK

SWDIO

SW-DP

POWER

CxxxPWRUPREQ

CxxxPWRUPRACK

Power

External

debugger

Peripherals

RAM and flash

APB/AHB

AHB

AHB-AP

DAP bus

interconnect

APPROTECT.PALL / SECUREAPPROTECT.PALL

CTRL-AP

UICR

NVMC

ETM

ITM

TPIU

Trace

TRACEDATA[3]

TRACEDATA[2]

TRACEDATA[1]

TRACEDATA[0]

TRACECLK

Figure 113: Debug and trace overview

The main features of the debug and trace system include:

• Two-pin serial wire debug (SWD) interface, protocol version 1

• Access port connection

• Breakpoint unit (BPU) supports eight hardware breakpoint comparators

• Data watchpoint and trace (DWT) unit supports four watchpoint comparators

• Instrumentation trace macrocell (ITM)

• Embedded trace macrocell (ETM)

• Access protection through APPROTECT, ERASEPROTECT and SECUREAPPROTECT

• Trace port interface unit (TPIU)

• 4-bit parallel trace of ITM and ETM trace data

Note: When a system contains multiple CPU domains, it is important to notice that if one domain

(subsystem A) has master rights on another domain (subsystem B), the master subsystem can

have access to data from the slave subsytem. In this example, even if subsystem B is locked by

APPROTECT or ERASEPROTECT, subsystem A can access some data for subsystem B. Consequently,

even if the security permissions are managed per subsystem, it is mandatory to have a global

approach to the protection. Protecting a slave subsystem does not guarantee system security if the

master subsystem is not protected.

9.1.1 Special consideration regarding debugger access

A debugger, if desired, can be restricted to debug non-secure code only, and access non-secure memory

regions and peripherals using register SECUREAPPROTECT on page 42. Register APPROTECT on page 41 will

block all debugger access.

Debugger accesses are controlled as described in table below.

4418_1315 v2.0

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