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HC705RC17GRS/D Datasheet(PDF) 76 Page - NXP Semiconductors |
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HC705RC17GRS/D Datasheet(HTML) 76 Page - NXP Semiconductors |
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76 / 126 page  Carrier Modulator Transmitter (CMT) General Release Specification MC68HC705RC17 — Rev. 2.0 Carrier Modulator Transmitter (CMT) 9.5.3 Extended Space Operation In either time or FSK mode, the space period can be made longer than the maximum possible value of SBUFF. Setting the EXSPC bit in the MCSR will force the modulator to treat the next modulation period (beginning with the next load of MBUFF/SBUFF) as a space period equal in length to the mark and space counts combined. Subsequent modulation periods will consist entirely of these extended space periods with no mark periods. Clearing EXSPC will return the modulator to standard operation at the beginning of the next modulation period. To calculate the length of an extended space in time mode, use the equation: Where the subscripts 1, 2, ... n refer to the modulation periods that elapsed while the EXSPC bit was set. Similarly, to calculate the length of an extended space in FSK mode, use the equation: Where fcg is the frequency output from the carrier generator. For an example of extended space operation, see Figure 9-6. NOTE: The EXSPC feature can be used to emulate a zero mark event. Figure 9-6. Extended Space Operation ((SBUFF1)+(MBUFF2+1+SBUFF2) +... (MBUFFn+1+SBUFFn)) x 8 fosc texspace = secs ((SBUFF1)+(MBUFF2+1+SBUFF2)+... (MBUFFn+1+SBUFFn)) fcg texspace = secs SET EXSPC CLEAR EXSPC Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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