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
(OSCULP32K).
Value | Name | Description |
---|---|---|
0x0 | OFF | - |
0x1 | 8CLK | 0.008s |
0x2 | 16CLK | 0.016s |
0x3 | 32CLK | 0.031s |
0x4 | 64CLK | 0.063s |
0x5 | 128CLK | 0.125s |
0x6 | 256CLK | 0.25s |
0x7 | 512CLK | 0.5s |
0x8 | 1KCLK | 1s |
0x9 | 2KCLK | 2s |
0xA | 4KCLK | 4s |
0xB | 8KCLK | 8s |
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 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
(OSCULP32K).
Value | Name | Description |
---|---|---|
0x0 | OFF | - |
0x1 | 8CLK | 0.008s |
0x2 | 16CLK | 0.016s |
0x3 | 32CLK | 0.031s |
0x4 | 64CLK | 0.063s |
0x5 | 128CLK | 0.125s |
0x6 | 256CLK | 0.25s |
0x7 | 512CLK | 0.5s |
0x8 | 1KCLK | 1s |
0x9 | 2KCLK | 2s |
0xA | 4KCLK | 4s |
0xB | 8KCLK | 8s |
Other | - | Reserved |