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 the LOCK bit in WDT.STATUS
is ‘
1’, all bits are change-protected (Access = R) - If the LOCK bit in WDT.STATUS
is ‘
0’, all bits can be changed (Access = R/W)
Note: Refer to
the Electrical Characteristics section for specific information regarding
the accuracy of the 32.768 kHz Ultra Low-Power Oscillator (OSC32K).
| Value | Name | Description |
|---|---|---|
| 0x0 | OFF | - |
| 0x1 | 8CLK | 7.8125 ms |
| 0x2 | 16CLK | 15.625 ms |
| 0x3 | 32CLK | 31.25 ms |
| 0x4 | 64CLK | 62.5 ms |
| 0x5 | 128CLK | 0.125s |
| 0x6 | 256CLK | 0.250s |
| 0x7 | 512CLK | 0.500s |
| 0x8 | 1KCLK | 1.0s |
| 0x9 | 2KCLK | 2.0s |
| 0xA | 4KCLK | 4.0s |
| 0xB | 8KCLK | 8.0s |
| 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 the Normal mode accordingly. In the Window mode, these bits select the duration of the open window.
The bits are optionally lock-protected:
- If the LOCK bit in WDT.STATUS
is ‘
1’, all bits are change-protected (Access = R) - If the LOCK bit in WDT.STATUS
is ‘
0’, all bits can be changed (Access = R/W)
Note: Refer to
the Electrical Characteristics section for specific information regarding
the accuracy of the 32.768 kHz Ultra Low-Power Oscillator (OSC32K).
| Value | Name | Description |
|---|---|---|
| 0x0 | OFF | - |
| 0x1 | 8CLK | 7.8125 ms |
| 0x2 | 16CLK | 15.625 ms |
| 0x3 | 32CLK | 31.25 ms |
| 0x4 | 64CLK | 62.5 ms |
| 0x5 | 128CLK | 0.125s |
| 0x6 | 256CLK | 0.250s |
| 0x7 | 512CLK | 0.500s |
| 0x8 | 1KCLK | 1.0s |
| 0x9 | 2KCLK | 2.0s |
| 0xA | 4KCLK | 4.0s |
| 0xB | 8KCLK | 8.0s |
| Other | - | Reserved |