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HC705RC16GRS/D 데이터시트(PDF) 68 Page - NXP Semiconductors

부품명 HC705RC16GRS/D
상세설명  The MC68HC705RC16 is a low-cost addition to the M68HC05 Family of microcontrollers (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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HC705RC16GRS/D 데이터시트(HTML) 68 Page - NXP Semiconductors

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Carrier Modulator Transmitter (CMT)
General Release Specification
MC68HC705RC16 — Rev. 3.0
Carrier Modulator Transmitter (CMT)
9.4 Carrier Generator
The carrier signal is generated by counting a predetermined number of
input clocks (500 ns for a 2-MHz oscillator) for both the carrier high time
and the carrier low time. The period is determined by the total number of
clocks counted. The duty cycle is determined by the ratio of high time
clocks to total clocks counted. The high and low time values are user
programmable and are held in two registers. An alternate set of high/low
count values is held in another set of registers to allow the generation of
dual frequency FSK (frequency shift keying) protocols without CPU
intervention. The MCGEN bit in the MCSR must be set and the BASE bit
in the MCSR must be cleared to enable carrier generator clocks. The
block diagram is shown in Figure 9-2.
Figure 9-2. Carrier Generator Block Diagram
CLK
6-BIT UP COUNTER
=?
=?
CLR
PRIMARY HIGH COUNT REGISTER
SECONDARY HIGH COUNT REGISTER
MODE
PRIMARY/
SELECT
CARRIER OUT
SECONDARY
BASE
fOSC
MODULATOR/
CARRIER GENERATOR
ENABLE
PRIMARY LOW COUNT REGISTER
SECONDARY LOW COUNT REGISTER
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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