41594B datasheet(181/372 Pages) MICROCHIP

181 / 372 page

 2011-2012 Microchip Technology Inc.

Preliminary

DS41594B-page 181

PIC12LF1840T48A

23.5

Carrier Source Polarity Select

The signal provided from any selected input source for

the carrier high and carrier low signals can be inverted.

Inverting the signal for the carrier high source is

enabled by setting the MDCHPOL bit of the MDCARH

enabled by setting the MDCLPOL bit of the MDCARL

23.6

Carrier Source Pin Disable

Some peripherals assert control over their correspond-

ing output pin when they are enabled. For example,

when the CCP1 module is enabled, the output of CCP1

is connected to the CCP1 pin.

This default connection to a pin can be disabled by set-

ting the MDCHODIS bit in the MDCARH register for the

carrier high source and the MDCLODIS bit in the

MDCARL register for the carrier low source.

23.7

Programmable Modulator Data

The MDBIT of the MDCON register can be selected as

the source for the modulator signal. This gives the user

the ability to program the value used for modulation.

23.8

Modulator Source Pin Disable

The modulator source default connection to a pin can

be disabled by setting the MDMSODIS bit in the

MDSRC register.

23.9

Modulated Output Polarity

The modulated output signal provided on the MDOUT

pin can also be inverted. Inverting the modulated out-

put signal is enabled by setting the MDOPOL bit of the

MDCON register.

23.10 Slew Rate Control

The slew rate limitation on the output port pin can be

disabled. The slew rate limitation can be removed by

clearing the MDSLR bit in the MDCON register.

23.11 Operation in Sleep Mode

The Data Signal Modulator (DSM) module is not

affected by Sleep mode. The DSM can still operate

during Sleep, if the carrier and modulator input sources

are also still operable during Sleep.

23.12 Effects of a Reset

Upon any device Reset, the DSM module is disabled.

The user’s firmware is responsible for initializing the

module before enabling the output. The registers are

reset to their default values.

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