RM0312 datasheet(259/275 Pages) STMICROELECTRONICS

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RM0312

ProxSense™ (PXS)

273

22.9.2

ProxSense Control Register 2 (PXS_CR2)

Address offset: 0x01

Reset value: 0x00

7654321

EOCITEN

FCCITEN

NOISEDETEN

Reserved

RXGROUP

RXCOUPLING

SYNCEN

SYNCEDGE

Bit 7 EOCITEN: End of conversion interrupt enable

0: End of conversion interrupt disabled

1: End of conversion interrupt enabled

When enabled, an interrupt occurs when EOCF = 1, i.e., once all the conversions on the receivers

have been completed. EOCF must be cleared during the interrupt service routine.

Bit 6 FCCITEN: First conversion completion interrupt enable

0: First conversion completion interrupt disabled

1: First conversion completion interrupt enabled

When enabled, an interrupt occurs when FCCF = 1, i.e., a first conversion is completed on one of the

enabled receivers. Subsequent conversion completions on other channels do not trigger an interrupt,

even if FCCF was previously cleared. Software can determine which channels have completed their

conversions by reading the PXS_RXSR register.

Bit 5 NOISEDETEN: Noise detection enable

0: RF Noise detection disabled

1: RF Noise detection enabled

When NOISEDETEN = 1, the RF noise detection circuit is enabled. An antenna should be connected

to the PXS_RFIN pin to detect RF noise properly. NOISEDETF in PXS_ISR indicates if noise was

detected during a conversion.

Note: This bit can be modified only when PXSEN = 0.

Bit 4 Reserved

Bit 3 RXGROUP: Rx group selection

0: Rx ‘A’ group (RX0A to RX9A) is active

1: Rx ‘B’ group (RX0B to RX9B) is active

Note: When RXGROUP = 0, the Rx ‘B’ group is in the inactive state (as specified by PXS_RXINSR),

and vice-versa.

Note: This bit can be modified only when CIPF = 0.

Bit 2 RXCOUPLING: Reduce coupling between receiver lines

0: The charge transfer cycle stops on a Rx line when its corresponding Cs has reached the

threshold voltage (VTHR).

1: Each Rx which is activated (RXENn = 1) continues to toggle until all of the activated Rx channels

have reached the threshold voltage (VTHR) or a timeout occurs.

For applications where the Rx lines have significant coupling between each other, it may be beneficial

to set this bit so that the parasitic coupling on a given Rx line does not increase after a neighboring Rx

channel has reached the threshold voltage.

Resetting this bit to 0 can reduce power consumption since some Rx lines would likely toggle for

shorter periods of time.

Note: This bit can be modified only when CIPF = 0.

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