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| 型号： | MC68HC05RC8FN |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 99/122页 |
| 文件大小： | 2962K |
| 代理商： | MC68HC05RC8FN |
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Carrier Modulator Transmitter (CMT)
General Release Specification
MC68HC05RC16 — Rev. 3.0
Carrier Modulator Transmitter (CMT)
The mark and space time equations for FSK mode are:
Where fcg is the frequency output from the carrier generator, setting the
DIV2 bit in the MCSR will double mark and space times.
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:
tmark
MBUFF
1
+
fcg
-------------------------------
s
sec
=
tspace
SBUFF
fcg
---------------------s
sec
=
((SBUFF1)+(MBUFF2+1+SBUFF2) +... (MBUFFn+1+SBUFFn)) x 8
fosc
texspace =
secs
((SBUFF1)+(MBUFF2+1+SBUFF2)+... (MBUFFn+1+SBUFFn))
fcg
texspace =
secs
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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