ATtiny1624/1626/1627

CTRLA

Control A

  0x00 8 Configuration Change Protection From FUSE.WDTCFG    

Control A

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

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:

Note: Refer to the Electrical Characteristics section for specific information regarding the accuracy of the 32.768 kHz Ultra-Low Power Oscillator (OSCULP32K).
ValueNameDescription
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

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:

Note: Refer to the Electrical Characteristics section for specific information regarding the accuracy of the 32.768 kHz Ultra-Low Power Oscillator (OSCULP32K).
ValueNameDescription
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