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HC705RC17GRS/D 데이터시트(PDF) 76 Page - NXP Semiconductors

부품명 HC705RC17GRS/D
상세설명  The MC68HC705RC17 is a general-purpose, low-cost addition to the M68HC05 Family of microcontroller units (MCUs) and is suitable for remote control applications.
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제조업체  NXP [NXP Semiconductors]
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HC705RC17GRS/D 데이터시트(HTML) 76 Page - NXP Semiconductors

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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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