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: 99/126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
72
Carrier Modulator Transmitter (CMT)
Freescale Semiconductor
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
CLOCK
AND
OUTP
UT
CONTROL
PRIMARY HIGH COUNT REGISTER
SECONDARY HIGH COUNT REGISTER
COUNT
REGISTER
SEL
ECT
CONTROL
MODE
PRIMARY/
SELECT
CARRIER OUT
SECONDARY
BASE
fOSC
MODULATOR/
CARRIER GENERATOR
ENABLE
PRIMARY LOW COUNT REGISTER
SECONDARY LOW COUNT REGISTER
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