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| 型號： | PULSE |
| 英文描述： | Pulse Period/Width Measurement on the M16C/62 |
| 中文描述： | 脈沖持續(xù)時(shí)間/寬度測量的雙隨機(jī)PWM |
| 文件頁數(shù)： | 4/13頁 |
| 文件大?。?/td> | 410K |
| 代理商： | PULSE |
Pulse Period/Width Measurement on the M16C/62
M16C
3.2 Pulse Width Measurement
Pulse Width Measurement Mode operates in much the same way except the count register is transferred
to the reload register for every edge detected on the TBi
IN
pin, and the counter resets and resumes
counting, as shown in Figure 3. Again, note that the value of the counter immediately after the ‘start count
flag’ is set is indeterminate and an overflow could occur before the first falling edge. This measurement is
also free running but now the user must determine by software whether the measurement is for the high
or low width.
Figure 3. Operation Timing When Measuring a Pulse Width
4. Configuring Pulse Period/Pulse Width Measurement Mode
To configure a timer for Pulse Period/Pulse Width Measurement Mode:
1.
Load the timer mode register, TAiMR.
Select Measurement Mode: bits TMOD0 = 0, TMOD1 = 1.
Set the MR0 and MR1 bits for period or width measurement.
Clear the MR2 bit for period or width measurement.
MR3 is the timer Bi overflow flag (can be cleared but not set).
Select the clock source (f1, f/8, f/32, or fc/32): bits TCK0,TCK1 register.
2.
Set the timer ‘interrupt priority level’, TBiIC, to at least 1 if required.
AN-DECE-MCU-6-A
May 2002
3
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