參數(shù)資料
型號： MC68HC705RC16FN
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁數(shù)： 93/120頁
文件大?。?/td> 547K
代理商： MC68HC705RC16FN
NON-DISCLOSURE
AGREEMENT
REQUIRED
Carrier Modulator Transmitter (CMT)
General Release Specification
MC68HC705RC16 — Rev. 3.0
74
Carrier Modulator Transmitter (CMT)
MOTOROLA
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 9-8.
The mark and space time equations are:
Setting the DIV2 bit in the MCSR will double mark and space times.
tmark
MBUFF
1
+
() 8
×
fosc
----------------------------------------------s
sec
=
tspace
SBUFF
8
×
fosc
------------------------------
s
sec
=
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