ATtiny1624/1626/1627

CTRLA

Control A

  0x00 8 Configuration Change Protection 0x00    

Control A

Bit  7 6 5 4 3 2 1 0  
    IVSEL CVT         LVL0RR  
Access    R/W R/W         R/W  
Reset    0 0         0  

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