19.7 Register Summary

The register mapping depends on the Operating Mode bits in the Control register (CTRL.MODE). The register summary is presented for each of the three modes.

Table 19-1. MODE0 - Mode Register Summary
Offset	Name	Bit Pos.
0x00	CTRL	7:0	MATCHCLR				MODE[1:0]		ENABLE	SWRST
0x01	CTRL	15:8					PRESCALER[3:0]
0x02	READREQ	7:0			ADDR[5:0]
0x03	READREQ	15:8	RREQ	RCONT
0x04	EVCTRL	7:0	PEREO7	PEREO6	PEREO5	PEREO4	PEREO3	PEREO2	PEREO1	PEREO0
0x05	EVCTRL	15:8	OVFEO							CMPEO0
0x06	INTENCLR	7:0	OVF	SYNCRDY						CMP0
0x07	INTENSET	7:0	OVF	SYNCRDY						CMP0
0x08	INTFLAG	7:0	OVF	SYNCRDY						CMP0
0x09	Reserved
0x0A	STATUS	7:0	SYNCBUSY
0x0B	DBGCTRL	7:0								DBGRUN
0x0C	FREQCORR	7:0	SIGN	VALUE[6:0]
0x0D ... 0x0F	Reserved
0x10	COUNT	7:0	COUNT[7:0]
0x11		15:8	COUNT[15:8]
0x12		23:16	COUNT[23:16]
0x13		31:24	COUNT[31:24]
0x14 ... 0x17	Reserved
0x18	COMP0	7:0	COMP[7:0]
0x19		15:8	COMP[15:8]
0x1A		23:16	COMP[23:16]
0x1B		31:24	COMP[31:24]

Table 19-2. MODE1 - Mode Register Summary
Offset	Name	Bit Pos.
0x00	CTRL	7:0					MODE[1:0]		ENABLE	SWRST
0x01	CTRL	15:8					PRESCALER[3:0]
0x02	READREQ	7:0			ADDR[5:0]
0x03	READREQ	15:8	RREQ	RCONT
0x04	EVCTRL	7:0	PEREO7	PEREO6	PEREO5	PEREO4	PEREO3	PEREO2	PEREO1	PEREO0
0x05	EVCTRL	15:8	OVFEO						CMPEO1	CMPEO0
0x06	INTENCLR	7:0	OVF	SYNCRDY					CMP1	CMP0
0x07	INTENSET	7:0	OVF	SYNCRDY					CMP1	CMP0
0x08	INTFLAG	7:0	OVF	SYNCRDY					CMP1	CMP0
0x09	Reserved
0x0A	STATUS	7:0	SYNCBUSY
0x0B	DBGCTRL	7:0								DBGRUN
0x0C	FREQCORR	7:0	SIGN	VALUE[6:0]
0x0D ... 0x0F	Reserved
0x10	COUNT	7:0	COUNT[7:0]
0x11	COUNT	15:8	COUNT[15:8]
0x12	Reserved
0x13	Reserved
0x14	PER	7:0	PER[7:0]
0x15	PER	15:8	PER[15:8]
0x16	Reserved
0x17	Reserved
0x18	COMP0	7:0	COMP[7:0]
0x19	COMP0	15:8	COMP[15:8]
0x1A	COMP1	7:0	COMP[7:0]
0x1B	COMP1	15:8	COMP[15:8]

Table 19-3. MODE2 - Mode Register Summary
Offset	Name	Bit Pos.
0x00	CTRL	7:0	MATCHCLR	CLKREP			MODE[1:0]		ENABLE	SWRST
0x01	CTRL	15:8					PRESCALER[3:0]
0x02	READREQ	7:0			ADDR[5:0]
0x03	READREQ	15:8	RREQ	RCONT
0x04	EVCTRL	7:0	PEREO7	PEREO6	PEREO5	PEREO4	PEREO3	PEREO2	PEREO1	PEREO0
0x05	EVCTRL	15:8	OVFEO							ALARMEO0
0x06	INTENCLR	7:0	OVF	SYNCRDY						ALARM0
0x07	INTENSET	7:0	OVF	SYNCRDY						ALARM0
0x08	INTFLAG	7:0	OVF	SYNCRDY						ALARM0
0x09	Reserved
0x0A	STATUS	7:0	SYNCBUSY
0x0B	DBGCTRL	7:0								DBGRUN
0x0C	FREQCORR	7:0	SIGN	VALUE[6:0]
0x0D ... 0x0F	Reserved
0x10	CLOCK	7:0	MINUTE[1:0]		SECOND[5:0]
0x11		15:8	HOUR[3:0]				MINUTE[5:2]
0x12		23:16	MONTH[1:0]		DAY[4:0]					HOUR[4]
0x13		31:24	YEAR[5:0]						MONTH[3:2]
0x14 ... 0x17	Reserved
0x18	ALARM0	7:0	MINUTE[1:0]		SECOND[5:0]
0x19		15:8	HOUR[3:0]				MINUTE[5:2]
0x1A		23:16	MONTH[1:0]		DAY[4:0]					HOUR[4]
0x1B		31:24	YEAR[5:0]						MONTH[3:2]
0x1C	MASK	7:0						SEL[2:0]

SAM D21/DA1 Family

19.7 Register Summary