參數(shù)資料
型號(hào): M34551E8-XXXFP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, OTPROM, MICROCONTROLLER, PQFP48
封裝: 7 X 10 MM, 0.65 MM PITCH, PLASTIC, QFP-48
文件頁(yè)數(shù): 9/154頁(yè)
文件大?。?/td> 1778K
代理商: M34551E8-XXXFP
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APPLICATION
2.4 Carrier generating circuit
2-29
4551 Group User’s Manual
Fig. 2.4.3 Carrier wave auto-control setting example 2
8.77
s
26.3
s
0.55 ms
37.9 kHz = 3.64 MHz ! 1/4 ! 1/24
0.55 ms = (37.9 kHz) ! (20+1)
-1
From preceding Figure 2.4.2.
Set Carrier Wave Output Auto-control
Carrier wave output auto-control is set to be valid.
Carrier wave output cotrol register C2 0
Auto-control valid by timer 1 ( TC2A instruction)
“1”
Clear Interrupt Request
The timer 1 interrupt activated condition is cleared.
Timer 1 interrupt request flag T1F “0” Clear the timer 1 interrupt activated condition
(SNZT1 instruction)
g Note when the interrupt request is cleared
When is executed, considering the skip of the next instruction according to the
interrupt request flag T1F, insert the NOP instruction after the SNZT1 instruction.
Start Timer 1 Operation
The timer 1 operation which is temporarily stopped is restarted.(Timer is stopped because count
source is not operating.)
Timer control register W2
Timer 1 operation start ( TW2A instruction)
b3
b0
!
1
!!
Timer 1 interrupt occur enabled ( TV1A instruction)
Enable Interrupts
Timer 1 interrupt which is temporarily disabled is enabled.
Interrupt control register V1
b3
b0
1 !
!!
Start Carrier Output
Carrier output is started. (In this time, timer 1 operation is started simultaneously.)
Carrier wave generating control flag CR
Carrier wave generating started ( STCR instruction)
“1”
Carrier output started
Setting the Next Output Waveform
Set Next Waveform Data
The next carrier output length is set to bit C2 0 and reload register R1.
Interrupt occurs
Set Next Waveform Data
The next carrier output length is set to bit C2 0 and reload register R1.
11
12
repeated
“!” : it can be “0” or “1.”
System clock
Carrier wave
dividing ratio
Timer 1 count value
Carrier wave
frequency
Refer to Figure 2.4.4 for the detail
of setting output data.
VA The carrier wave which duty ratio is 1/3 is output with a 3.64 MHz oscillator for the 0.55 ms.
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