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PIC12F1822-I/MF Datasheet(PDF) 189 Page - Microchip Technology |
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PIC12F1822-I/MF Datasheet(HTML) 189 Page - Microchip Technology |
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189 / 398 page  2010 Microchip Technology Inc. Preliminary DS41413A-page 189 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 D Q MDBIT MDMIN CCP1 Comparator C1 Comparator C2(1) Reserved 0000 0001 0010 0011 0101 0110 0111 1000 0011 1001 1010 No Channel Selected VSS MDCIN1 MDCIN2 CLKR CCP1 Reserved 0000 0001 0010 0011 0100 0101 0110 1111 * * No Channel Selected VSS MDCIN1 MDCIN2 CLKR CCP1 Reserved 0000 0001 0010 0011 0100 0101 0110 0111 1000 1111 * * No Channel Selected MDCH<3:0> MDMS<3:0> MDCL<3:0> 1111 * * MSSP1 SDO1 Reserved EUSART SYNC MDCHPOL MDCLPOL D Q 1 0 SYNC 1 0 MDCHSYNC MDCLSYNC MDOUT MDOPOL CARH CARL EN MDEN Data Signal Modulator MOD MDOE * * Reserved No Channel Selected * Note 1: PIC16F/LF1823 only. |
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