参数资料
型号: MC68HC05RC18FN
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: 106/126页
文件大小: 1180K
代理商: MC68HC05RC18FN
NON-DISCLOSURE
AGREEMENT
REQUIRED
Carrier Modulator Transmitter (CMT)
General Release Specification
MC68HC05RC18 Rev. 2.1
78
Carrier Modulator Transmitter (CMT)
Freescale Semiconductor
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.
The mark and space time equations are:
Setting the DIV2 bit in the MCSR will double mark and space times.
Figure 9-5. CMT Operation in Time Mode
tmark
MBUFF
1
+
() 8
×
fosc
----------------------------------------------s
sec
=
tspace
SBUFF
8
×
fosc
------------------------------
s
sec
=
MODULATOR GATE
fOSC ÷ 8
TIME MODE OUTPUT
BASEBAND OUTPUT
MARK
SPACE
MARK
SPACE
CARRIER FREQUENCY
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