参数资料
型号: MC68HC705RC17P
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.097 MHz, MICROCONTROLLER, PDIP28
封装: PLASTIC, DIP-28
文件页数: 101/126页
文件大小: 3079K
代理商: MC68HC705RC17P
NON-DISCLOSURE
AGREEMENT
REQUIRED
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
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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