参数资料
型号: M34551E8FP
元件分类: 微控制器/微处理器
英文描述: 4-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP48
封装: 7 X 10 MM, 0.65 MM PITCH, PLASTIC, QFP-48
文件页数: 12/155页
文件大小: 1329K
代理商: M34551E8FP
APPLICATION
2.4 Carrier generating circuit
2-31
4551 Group User’s Manual
Fig. 2.4.5 Carrier wave by software generating example
(2)
Carrier wave generating by software
Carrier wave generating can be output by software count.
Outline: The carrier wave generating circuit is set to “no carrier wave” and carrier wave is generated
by software.
Specifications: The 37.9 kHz carrier wave is generated by using main clock frequency f(XIN) = 3.64
MHz.
Figure 2.4.5 shows the generating example of carrier wave by software.
STCR NOP
SPCR
NOP
STCR
SPCR
STCK
CARR output
1.10
s
1 instruction (3.30
s)
b3
b0
1
0
1
0
Set Carrier Wave Output Auto-control
Carrier wave output auto-control is set to be invalid.
Carrier wave output control register C20
“0”
Auto-control by timer 1 invalid (TC2A instruction)
Set Carrier Generation Circuit
Carrier wave frequency and duty ratio is set.
Carrier wave selection register C1
No carrier wave (TC1A instruction)
Start Carrier Output
Carrier output is started.
Description
instruction
example
8.79
s
17.58
s
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