参数资料
型号: MC68HC05RC18DW
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: SOIC-28
文件页数: 100/124页
文件大小: 457K
代理商: MC68HC05RC18DW
Carrier Modulator Transmitter (CMT)
Modulator
MC68HC05RC18 Rev. 2.0
General Release Specification
MOTOROLA
Carrier Modulator Transmitter (CMT)
77
NON-DISCLOSURE
AGREEMENT
REQUIRED
modulates a single-carrier frequency or no carrier (baseband). In FSK
mode, the modulator counts carrier periods and instructs the carrier
generator to alternate between two carrier frequencies whenever a
modulation period (mark + space counts) expires.
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
=?
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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