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Instrumentation Trace Macrocell Unit

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9.3.1 ITM Trace Privilege Register, ITM_TPR

The ITM_TPR characteristics are:

Purpose Enables an operating system to control the stimulus ports that are

accessible by user code.

Usage constraints You can only write to this register in privileged mode.

Configurations This register is available if the ITM is configured in your implementation.

Attributes See Table 9-1 on page 9-4.

Figure 9-1 shows the ITM_TPR bit assignments.

Figure 9-1 ITM_TPR bit assignments

Table 9-2 shows the ITM_TPR bit assignments.

Reserved

31 43 0

PRIVMASK

Table 9-2 ITM_TPR bit assignments

Bits Name Function

[31:4] - Reserved.

[3:0] PRIVMASK Bit mask to enable tracing on ITM stimulus ports:

bit [0] = stimulus ports [7:0]

bit [1] = stimulus ports [15:8]

bit [2] = stimulus ports [23:16]

bit [3] = stimulus ports [31:24].

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ARM Cortex-M3 Guía de usuario Pagina 86