Control A

Name:
CTRLA
Offset:
0x00
Reset:
From FUSE.WDTCFG
Access:
Configuration Change Protection
Bit76543210
WINDOW[3:0]PERIOD[3:0]
AccessR/WR/WR/WR/WR/WR/WR/WR/W
Resetxxxxxxxx

Bits 7:4 – WINDOW[3:0]: Window

Window

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

The bits are optionally lock protected:

ValueNameDescription
0x0 OFF -
0x1 8CLK 0.008s
0x2 16CLK 0.016s
0x3 32CLK 0.032s
0x4 64CLK 0.064s
0x5 128CLK 0.128s
0x6 256CLK 0.256s
0x7 512CLK 0.512s
0x8 1KCLK 1.0s
0x9 2KCLK 2.0s
0xA 4KCLK 4.1s
0xB 8KCLK 8.2s
other - Reserved

Bits 3:0 – PERIOD[3:0]: Period

Period

Writing a non-zero value to this bit enables the WDT, and selects the according timeout period in normal mode. In window mode, these bits select the duration of the open window.

The bits are optionally lock protected:

ValueNameDescription
0x0 OFF -
0x1 8CLK 0.008s
0x2 16CLK 0.016s
0x3 32CLK 0.032s
0x4 64CLK 0.064s
0x5 128CLK 0.128s
0x6 256CLK 0.256s
0x7 512CLK 0.512s
0x8 1KCLK 1.0s
0x9 2KCLK 2.0s
0xA 4KCLK 4.1s
0xB 8KCLK 8.2s
other - Reserved