20.5.1 Control A
| Name: | CTRLA |
| Offset: | 0x00 |
| Reset: | From FUSE.WDTCFG |
| Property: | Configuration Change Protection |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| WINDOW[3:0] | PERIOD[3:0] | ||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | x | x | x | x | x | x | x | x | |
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)
| Value | Name | Description |
|---|---|---|
| 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 | 1.024s |
| 0x9 | 2KCLK | 2.048s |
| 0xA | 4KCLK | 4.096s |
| 0xB | 8KCLK | 8.192s |
| 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)
| Value | Name | Description |
|---|---|---|
| 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 |
