參數(shù)資料
型號: MC68HC705RC17DW
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.097 MHz, MICROCONTROLLER, PDSO28
封裝: SOIC-28
文件頁數(shù): 98/126頁
文件大?。?/td> 3079K
代理商: MC68HC705RC17DW
Carrier Modulator Transmitter (CMT)
Modulator
MC68HC705RC17 Rev. 2.0
General Release Specification
Carrier Modulator Transmitter (CMT)
NON-DISCLOSURE
AGREEMENT
REQUIRED
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
s 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
COUNTER
fOSC
EOC FLAG
MBUFF
SBUFF
SREG *
13-BIT DOWN COUNTER *
* DENOTES HIDDEN REGISTER
12 BITS
MS
BIT
12
CONTROL/STATUS REGISTER
MODULATOR
EOC INTERRUPT ENABLE
BASE
MODE
÷ 8
CLOCK CONTROL
CARRIER OUT
LOAD MBUFF/SBUFF
SYSTEM CONTROL
EOC
FLAG
SET
MODULATOR GATE
OUT
PRIMARY/SECONDARY SELECT
.
MODULATOR
MODULATOR/
CARRIER GENERATOR
ENABLE
EXTENDED
SPACE
DIV2
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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