Datasheet

 2012-2013 Microchip Technology Inc. DS30009312B-page 299
PIC24FJ128GC010 FAMILY
20.0 DATA SIGNAL MODULATOR
The Data Signal Modulator (DSM) allows the user to
mix a digital data stream (the “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 it is provided to the MDOUT
pin. 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)
Figure 20-1 shows a simplified block diagram of the
Data Signal Modulator peripheral.
FIGURE 20-1: SIMPLIFIED BLOCK DIAGRAM OF THE DATA SIGNAL MODULATOR
Note: This data sheet summarizes the features of
this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
“Data Signal Modulator (DSM)”
(DS39744). The information in this data
sheet supersedes the information in the
FRM.
D
Q
MDBIT
MDMIN
SSP1 (SDO
X)
SSP2 (SDO
X)
UART1 (TX)
UART2 (TX)
UART3 (TX)
UART4 (TX)
VSS
MDCIN1
MDCIN2
REFO Clock
OC/PWM1
OC/PWM2
OC/PWM3
OC/PWM4
CH<3:0>
MS<3:0>
CL<3:0>
OC/PWM1
OC/PWM2
SYNC
CHPOL
CLPOL
D
Q
1
0
SYNC
CHSYNC
CLSYNC
MDOUT
MDOPOL
MDOE
MDCARH
MDCARL
EN
MDEN
Data Signal
Modulator
MDCON
OC/PWM5
OC/PWM6
OC/PWM7
VSS
MDCIN1
MDCIN2
REFO Clock
OC/PWM1
OC/PWM2
OC/PWM3
OC/PWM4
OC/PWM5
OC/PWM6
OC/PWM7
OC/PWM3
OC/PWM4
OC/PWM5
OC/PWM6
OC/PWM7
1
0