- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄370026 > PULSE Pulse Period/Width Measurement on the M16C/62 PDF資料下載
參數(shù)資料
| 型號： | PULSE |
| 英文描述： | Pulse Period/Width Measurement on the M16C/62 |
| 中文描述： | 脈沖持續(xù)時間/寬度測量的雙隨機PWM |
| 文件頁數(shù)： | 3/13頁 |
| 文件大?。?/td> | 410K |
| 代理商： | PULSE |
Pulse Period/Width Measurement on the M16C/62
M16C
3. Pulse Period/Pulse Width Measurement Mode Description
As illustrated in Figure 1, the timer TBi register consists of two parts, a counter and a reload register. In
Measurement Mode, when an effective edge appears on the TBi
IN
pin, the count value is transferred to
the reload register and the CPU can read this value by performing a read on the TBi register. The
measured time is the counter value (TBi) divided by the frequency of the clock source (Fi). Two period
measurement options are available that measure from falling edge to falling edge or rising edge to rising
edge. For width measurement, the measurement is taken at both edges and software determines if the
measured value is for the high width or low.
3.1 Pulse Period Measurement
In Period Measurement Mode (e.g. falling edge to falling edge), after the ‘start count flag’ is set, the
counter counts up using the selected clock source and every time a falling edge is detected on the TBi
IN
pin, the value in the counter is transferred to the reload register, the counter is reset to zero, and then
continues counting. At the same time, the timer interrupt request bit is set and an interrupt is generated if
the timer interrupt priority level is set above the current CPU priority level (if the I flag in the CPU flag
register is cleared, the interrupt will not be serviced until the flag is set). If the timer’s counter overflows
within a period, it will also generate the interrupt and the MR3 bit in the TBiMR is set to distinguish
between the interrupt causes. Note that the measurement is free running and the reload register contains
the most recent measurement. The user has the option of polling the TBi register or reading it in an
interrupt service routine. Also 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. Figure 2 illustrates this.
Figure 2. Operation Timing When Measuring a Pulse Period
AN-DECE-MCU-6-A
May 2002
2
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PULSPRO | SOFTWARE PULSAR PROF |
| PV35GROMMETPK100 | 15NS, 28 PLCC, IND TEMP(EPLD) |
| PV36AGROMMETPK100 | GROMMET 12.7MM Inhalt pro Packung: 100 Stk. |
| PV36GROMMETPK100 | 15NS, 24 PDIP, IND TEMP(EPLD) |
| PV37AGROMMETPK100 | 15NS, 24 SOIC, COM TEMP(EPLD) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PULSE-M850 | 制造商:HOBUT 功能描述:MODULE PULSE FOR USE WITH M850 |
| PULSE-VALVES-9-99 | 制造商:SENSORTECHNICS 制造商全稱:Sensortechnics GmbH 功能描述:High-performance media resistant soleniod valves |
| PULSEW3579 | 制造商:PULSE 制造商全稱:Pulse A Technitrol Company 功能描述:Ferrite-backed Embedded NFC Antenna |
| PULSEW3580 | 制造商:PULSE 制造商全稱:Pulse A Technitrol Company 功能描述:Ferrite-backed Embedded NFC Antenna |
| PULSEW7001 | 制造商:PULSE 制造商全稱:Pulse A Technitrol Company 功能描述:NFC Flex Stamp Antenna |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。