PIC16F1828T-I/SL View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F1828T-I/SL

28/40/44-Pin, Low-Power, High-Performance Microcontrollers with nanoWatt XLP Technology

Microchip Technology 

PIC16(L)F1824/1828

23.0 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 23-1 shows a Simplified Block Diagram of the

Data Signal Modulator peripheral.

FIGURE 23-1:

SIMPLIFIED BLOCK DIAGRAM OF THE DATA SIGNAL MODULATOR

MDCH<3:0>

VSS

MDCIN1

MDCIN2

CLKR

CCP1

CCP2

CCP3

CCP4

Reserved

No Channel

Selected

0000

0001

0010

0011

0100

0101 CARH

0110

0111

1000

*

*

1111

MDMS<3:0>

MDBIT

MDMIN

CCP1

CCP2

CCP3

CCP4

Comparator C1

Comparator C2

MSSP1 SDO1

MSSP2 SDO2

EUSART

Reserved

No Channel

Selected

0000

0001

0010

0011

0100

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

CCP2

CCP3

CCP4

Reserved

No Channel

Selected

0000

0001

0010

0011

0100

0101 CARL

0110

0111

1000

*

*

1111

MDCLPOL

D

SYNC

Q

1

0

MDCLSYNC

 2010 Microchip Technology Inc.

Preliminary

DS41419B-page 205

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