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HC705RC17GRS/D 데이터시트(PDF) 73 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]
홈페이지  http://www.nxp.com
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HC705RC17GRS/D 데이터시트(HTML) 73 Page - NXP Semiconductors

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Carrier Modulator Transmitter (CMT)
Modulator
MC68HC705RC17 — Rev. 2.0
General Release Specification
Carrier Modulator Transmitter (CMT)
Figure 9-4. Modulator Block Diagram
9.5.1 Time Mode
When the modulator operates in time mode, the modulation mark and
space periods consist of zero or an integer number of fosc ÷ 8 clocks (=
250 kHz @ 2 MHz osc). This provides a modulator resolution of 4
µs and
a maximum mark and space periods of about 16 ms (each). However, to
prevent carrier glitches which could affect carrier spectral purity, the
modulator control gate and carrier clock are synchronized. The carrier
signal is activated when the modulator gate opens. The modulator gate
can only close when the carrier signal is low. (The output logic level
during space periods is low). If the carrier generator is in baseband
mode (BASE bit in MCSR is high), the modulator output will be at a logic
1 for the duration of the mark period and at a logic 0 for the duration of a
space period. See Figure 9-5.
=?
0
fOSC
EOC FLAG
MBUFF
SBUFF
SREG *
13-BIT DOWN COUNTER *
* DENOTES HIDDEN REGISTER
12 BITS
12 BITS
12
12
CONTROL/STATUS REGISTER
MODULATOR
EOC INTERRUPT ENABLE
BASE
MODE
÷ 8
CLOCK CONTROL
CARRIER OUT
LOAD MBUFF/SBUFF
SYSTEM CONTROL
MODULATOR GATE
OUT
PRIMARY/SECONDARY SELECT
.
.
MODULATOR
MODULATOR/
CARRIER GENERATOR
ENABLE
DIV2
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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