Control A

Name:
CTRLA
Offset:
0x00
Reset:
0x00
Access:
Configuration Change Protection
Bit76543210
IVSELCVTLVL0RR
AccessR/WR/WR/W
Reset000

Bit 6 – IVSEL: Interrupt Vector Select

Interrupt Vector Select

When the entire Flash is configured as a BOOT section, this bit will be ignored.

Note:
  1. 1.A system reset will cause the Program Counter to be reset to 0x0000, regardless of the IVSEL bit value.
ValueDescription
0 The expected location of the interrupt vectors is directly after the BOOT section(1)
1 The expected location of the interrupt vectors is at the start of the BOOT section

Bit 5 – CVT: Compact Vector Table

Compact Vector Table

ValueDescription
0 Compact Vector Table function is disabled
1 Compact Vector Table function is enabled

Bit 0 – LVL0RR: Round Robin Priority Enable

Round Robin Priority Enable

This bit is not protected by the Configuration Change Protection mechanism.
ValueDescription
0 Priority is fixed for priority level 0 interrupt requests: The lowest interrupt vector address has the highest priority.
1 The round robin priority scheme is enabled for priority level 0 interrupt requests