27.7.6.2 Control B in Clock/Calendar mode (CTRLA.MODE=2)

Name: CTRLB
Offset: 0x2
Reset: 0x0000
Property: PAC Write-Protection, Enable-Protected

Bit 15141312111098 
 SEPTOACTF[2:0] DEBF[2:0] 
Access R/WR/WR/WR/WR/WR/WR/W 
Reset 0000000 
Bit 76543210 
 DMAENRTCOUTDEBASYNCDEBMAJ   GP0EN 
Access R/WR/WR/WR/WR/W 
Reset 00000 

Bit 15 – SEPTO Separate Tamper Outputs

ValueDescription
0IN[n] is compared tp OUT[0] (backward-compatible).
1IN[n] is compared tp OUT[n].

Bits 14:12 – ACTF[2:0] Active Layer Frequency

These bits define the prescaling factor for the RTC clock output (OUT) used during active layer protection in terms of the CLK_RTC.
ValueNameDescription
0x0DIV2CLK_RTC_OUT = CLK_RTC / 2
0x1DIV4CLK_RTC_OUT = CLK_RTC / 4
0x2DIV8CLK_RTC_OUT = CLK_RTC / 8
0x3DIV16CLK_RTC_OUT = CLK_RTC / 16
0x4DIV32CLK_RTC_OUT = CLK_RTC / 32
0x5DIV64CLK_RTC_OUT = CLK_RTC / 64
0x6DIV128CLK_RTC_OUT = CLK_RTC / 128
0x7DIV256CLK_RTC_OUT = CLK_RTC / 256

Bits 10:8 – DEBF[2:0] Debounce Frequency

These bits define the prescaling factor for the input debouncers in terms of the CLK_RTC.
ValueNameDescription
0x0DIV2CLK_RTC_DEB = CLK_RTC / 2
0x1DIV4CLK_RTC_DEB = CLK_RTC / 4
0x2DIV8CLK_RTC_DEB = CLK_RTC / 8
0x3DIV16CLK_RTC_DEB = CLK_RTC / 16
0x4DIV32CLK_RTC_DEB = CLK_RTC / 32
0x5DIV64CLK_RTC_DEB = CLK_RTC / 64
0x6DIV128CLK_RTC_DEB = CLK_RTC / 128
0x7DIV256CLK_RTC_DEB = CLK_RTC / 256

Bit 7 – DMAEN DMA Enable

The RTC can trigger a DMA request when the timestamp is ready in the TIMESTAMP register.
ValueDescription
0Tamper DMA request is disabled. Reading TIMESTAMP has no effect on INTFLAG.TAMPER.
1Tamper DMA request is enabled. Reading TIMESTAMP will clear INTFLAG.TAMPER.

Bit 6 – RTCOUT RTC Out Enable

ValueDescription
0The RTC active layer output is disabled.
1The RTC active layer output is enabled.

Bit 5 – DEBASYNC Debouncer Asynchronous Enable

ValueDescription
0The tamper input debouncers operate synchronously.
1The tamper input debouncers operate asynchronously.

Bit 4 – DEBMAJ Debouncer Majority Enable

ValueDescription
0The tamper input debouncers match three equal values.
1The tamper input debouncers match majority two of three values.

Bit 0 – GP0EN General Purpose 0 Enable

ValueDescription
0COMP0 compare function enabled. GP0 disabled.
1COMP0 compare function disabled. GP0 enabled.