PIC12F1822T-I/SL View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC12F1822T-I/SL

8/14-Pin Flash Microcontrollers with nanoWatt XLP Technology

Microchip Technology 

PIC12F/LF1822/16F/LF1823

22.0 DATA SIGNAL MODULATOR

The Data Signal Modulator (DSM) is a peripheral which

allows the user to mix a data stream, also known as a

modulator signal, with a carrier signal to produce a

modulated output.

Both the carrier and the modulator signals are supplied

to the DSM module either internally, from the output of

a peripheral, or externally through an input pin.

The modulated output signal is generated by perform-

ing a logical “AND” operation of both the carrier and

modulator signals and then provided to the MDOUT pin.

The carrier signal is comprised of two distinct and sep-

arate signals. A carrier high (CARH) signal and a car-

rier low (CARL) signal. During the time in which the

modulator (MOD) signal is in a logic high state, the

DSM mixes the carrier high signal with the modulator

signal. When the modulator signal is in a logic low

state, the DSM mixes the carrier low signal with the

modulator signal.

Using this method, the DSM can generate the following

types of Key Modulation schemes:

• Frequency-Shift Keying (FSK)

• Phase-Shift Keying (PSK)

• On-Off Keying (OOK)

Additionally, the following features are provided within

the DSM module:

• Carrier Synchronization

• Carrier Source Polarity Select

• Carrier Source Pin Disable

• Programmable Modulator Data

• Modulator Source Pin Disable

• Modulated Output Polarity Select

• Slew Rate Control

Figure 22-1 shows a Simplified Block Diagram of the

Data Signal Modulator peripheral.

FIGURE 22-1:

SIMPLIFIED BLOCK DIAGRAM OF THE DATA SIGNAL MODULATOR

MDCH<3:0>

VSS

MDCIN1

MDCIN2

CLKR

CCP1

Reserved

No Channel

Selected

0000

0001

0010

0011

0100

0101 CARH

0110

*

*

*

*

1111

MDMS<3:0>

MDBIT

MDMIN

CCP1

Reserved

No Channel

Selected

Comparator C1

Comparator C2(1)

MSSP1 SDO1

Reserved

EUSART

Reserved

No Channel

Selected

0000

0001

0010

0011

*

0101

0110 MOD

0111

1000

1001

1010

0011

*

*

1111

MDEN

EN

MDCHPOL

Data Signal

Modulator

D

SYNC

Q

1

0

MDCHSYNC

MDOPOL MDOE

MDOUT

MDCL<3:0>

VSS

MDCIN1

MDCIN2

CLKR

CCP1

Reserved

No Channel

Selected

0000

0001

0010

0011

0100

0101 CARL

0110

0111

1000

*

*

1111

MDCLPOL

D

SYNC

Q

1

0

MDCLSYNC

Note 1: PIC16F/LF1823 only.

 2010 Microchip Technology Inc.

Preliminary

DS41413A-page 189

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