38.6.21 ADC Extended Mode Register


Bit	31	30	29	28	27	26	25	24
		ALTCH	ADCMODE[1:0]			SIGNMODE[1:0]		TAG
Access		R/W	R/W	R/W		R/W	R/W	R/W
Reset		0	0	0		0	0	0


Bit	23	22	21	20	19	18	17	16
	TRACKX[1:0]		ALWAYS0	ASTE		OSR[2:0]
Access	R/W	R/W	R/W	R/W		R/W	R/W	R/W
Reset	0	0	0	0		0	0	0


Bit	15	14	13	12	11	10	9	8
			CMPFILTER[1:0]				CMPALL	CMPSEL[4]
Access			R/W	R/W			R/W	R/W
Reset			0	0			0	0


Bit	7	6	5	4	3	2	1	0
	CMPSEL[3:0]					CMPTYPE	CMPMODE[1:0]
Access	R/W	R/W	R/W	R/W		R/W	R/W	R/W
Reset	0	0	0	0		0	0	0

Bit 30 – ALTCH Alternate Channel Selection (Safety)

Value	Description
0	The regular channels are selected.
1	The alternate channels are selected.

Bits 29:28 – ADCMODE[1:0] ADC Running Mode

See Automatic Error Correction for details on ADC Running mode.

Value	Name	Description
0	NORMAL	Normal mode of operation.
1	OFFSET_ERROR	Offset Error mode to measure the offset error. See the table ADC Running Modes.
2	GAIN_ERROR_HIGH	Gain Error mode to measure the gain error. See the table ADC Running Modes.
3	GAIN_ERROR_LOW	Gain Error mode to measure the gain error. See the table ADC Running Modes.

Bits 26:25 – SIGNMODE[1:0] Sign Mode

If conversion results are signed and resolution is below 16 bits, the sign is extended up to bit 15 (for example, 0xF43 for 12-bit resolution is read as 0xFF43 and 0x467 is read as 0x0467). See Conversion Results Format.

Value	Name	Description
0	SE_UNSG_DF_SIGN	Single-ended channels: unsigned conversions Differential channels: signed conversions
1	SE_SIGN_DF_UNSG	Single-ended channels: signed conversions Differential channels: unsigned conversions
2	ALL_UNSIGNED	All channels: unsigned conversions
3	ALL_SIGNED	All channels: signed conversions

Bit 24 – TAG ADC_LCDR Tag

Value	Description
0	Sets ADC_LCDR.NO_OSR_CHNB/CHNBOSR to zero.
1	Appends the channel number to the conversion result in ADC_LCDR.

Bits 23:22 – TRACKX[1:0] Tracking Time x4, x8 or x16

Value	Name	Description
0	TRACKTIMx1	ADC_MR.TRACKTIM effect is multiplied by 1.
1	TRACKTIMx4	ADC_MR.TRACKTIM effect is multiplied by 4.
2	TRACKTIMx8	ADC_MR.TRACKTIM effect is multiplied by 8.
3	TRACKTIMx16	ADC_MR.TRACKTIM effect is multiplied by 16.

Bit 21 – ALWAYS0 Must always be written to 0

Bit 20 – ASTE Averaging on Single Trigger Event

Value	Name	Description
0	MULTI_TRIG_AVERAGE	The average requests several trigger events.
1	SINGLE_TRIG_AVERAGE	The average requests only one trigger event.

Bits 18:16 – OSR[2:0] Over Sampling Rate

Value	Name	Description
0	NO_AVERAGE	No averaging. ADC sample rate is maximum.
1	OSR4	1-bit enhanced resolution by averaging. ADC sample rate divided by 4.
2	OSR16	2-bit enhanced resolution by averaging. ADC sample rate divided by 16.
3	OSR64	3-bit enhanced resolution by averaging. ADC sample rate divided by 64.
4	OSR256	4-bit enhanced resolution by averaging. ADC sample rate divided by 256.

Bits 13:12 – CMPFILTER[1:0] Compare Event Filtering

Number of consecutive compare events necessary to raise the flag = CMPFILTER+1

When programmed to 0, the flag rises as soon as an event occurs.

See Comparison Window when using the filtering option (CMPFILTER > 0).

Bit 9 – CMPALL Compare All Channels

Value	Description
0	Only the channel indicated in CMPSEL is compared.
1	All channels are compared.

Bits 8:4 – CMPSEL[4:0] Comparison Selected Channel

If CMPALL = 0: CMPSEL indicates which channel has to be compared.

If CMPALL = 1: No effect.

Bit 2 – CMPTYPE Comparison Type

Value	Name	Description
0	FLAG_ONLY	Any conversion is performed and comparison function drives the COMPE flag.
1	START_CONDITION	Comparison conditions must be met to start the storage of all conversions until ADC_CR.CMPRST is set.

Bits 1:0 – CMPMODE[1:0] Comparison Mode

Value	Name	Description
0	LOW	When the converted data is lower than the low threshold of the window, generates the COMPE flag in ADC_ISR or, in Partial Wake-up mode, defines the conditions to exit the system from Wait mode.
1	HIGH	When the converted data is higher than the high threshold of the window, generates the COMPE flag in ADC_ISR or, in Partial Wake-up mode, defines the conditions to exit the system from Wait mode.
2	IN	When the converted data is in the comparison window, generates the COMPE flag in ADC_ISR or, in Partial Wake-up mode, defines the conditions to exit the system from Wait mode.
3	OUT	When the converted data is out of the comparison window, generates the COMPE flag in ADC_ISR or, in Partial Wake-up mode, defines the conditions to exit the system from Wait mode.

Name:	ADC_EMR
Offset:	0x50
Reset:	0x00000000
Property:	Read/Write