Nios® II Processor Reference Guide

ID 683836
Date 10/22/2020
Public
Document Table of Contents

3.4.2.3. The bstatus Register

The bstatus register holds a saved copy of the status register during break exception processing.
Table 14.  bstatus Control Register Fields
Bit Fields
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Reserved RSIE NMI PRS
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CRS IL IH EH U PIE

All fields in the bstatus register have read/write access. All fields reset to 0.

The Status Control Register Field Description table describes the details of the fields defined in the bstatus register.

When a break occurs, the value of the status register is copied into bstatus. Using bstatus, the debugger can restore the status register to the value prior to the break. The bret instruction causes the processor to copy bstatus back to status. Refer to the Processing a Break section for more information.

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