20.5.1 Control A

Name: CTRLA
Offset: 0x00
Reset: From FUSE.WDTCFG
Property: Configuration Change Protection

Bit 76543210 
 WINDOW[3:0]PERIOD[3:0] 
Access R/WR/WR/WR/WR/WR/WR/WR/W 
Reset xxxxxxxx 

Bits 7:4 – WINDOW[3:0] Window

Writing a non-zero value to these bits enables the Window mode, and selects the duration of the closed period accordingly.

The bits are optionally lock-protected:

  • If LOCK bit in WDT.STATUS is '1', all bits are change-protected (Access = R)
  • If LOCK bit in WDT.STATUS is '0', all bits can be changed (Access = R/W)
ValueNameDescription
0x0OFF-
0x18CLK0.008s
0x216CLK0.016s
0x332CLK0.032s
0x464CLK0.064s
0x5128CLK0.128s
0x6256CLK0.256s
0x7512CLK0.512s
0x81KCLK1.024s
0x92KCLK2.048s
0xA4KCLK4.096s
0xB8KCLK8.192s
other-Reserved

Bits 3:0 – PERIOD[3:0] Period

Writing a non-zero value to this bit enables the WDT, and selects the time-out period in Normal mode accordingly. In Window mode, these bits select the duration of the open window.

The bits are optionally lock-protected:

  • If LOCK in WDT.STATUS is '1', all bits are change-protected (Access = R)
  • If LOCK in WDT.STATUS is '0', all bits can be changed (Access = R/W)
ValueNameDescription
0x0OFF-
0x18CLK0.008s
0x216CLK0.016s
0x332CLK0.032s
0x464CLK0.064s
0x5128CLK0.128s
0x6256CLK0.256s
0x7512CLK0.512s
0x81KCLK1.0s
0x92KCLK2.0s
0xA4KCLK4.1s
0xB8KCLK8.2s
other-Reserved