304Chapter 9 16-Bit Timer/Event Counter PUser’s Manual U16580EE3V1UD009.5.8 Pulse width measurement mode (TPnMD2 to TPnMD0 = 110B)In the pulse width measurement mode, free-running count is performed. The value of the 16-bit counteris saved to capture register 0 (TPnCCR0), or capture register 1 (TPnCCR1) respectively, and the 16-bitcounter is cleared upon edge detection of the TIPn0 pin, or TIPn1 respectively. The external input pulsewidth can be measured as a result.However, when measuring a large pulse width that exceeds 16-bit counter overflow, perform judgmentwith the overflow flag. Since measurement of pulses for which overflow occurs twice or more is notpossible, adjust the operating frequency of the 16-bit counter.Depending on the selected capture input sources and specified edge detection three differentmeasurement methods can be applied.<1> Pulse period measurement<2> Alternating pulse width and pulse space measurement:This requires a fast interrupt handling, in order to measure pulse width and pulse space correctly.<3> Simultaneous pulse width and pulse space measurement:Both capture inputs are required to measure pulse width and pulse space simultaneously.The measurements methods are explained in the following sub-chapters.Cautions: 1. In the pulse width measurement mode, the external event clock input (TEVTPn) isprohibited (TPnCTL1.TPnEEE = 0).2. When an internal count clock ≤ f XX /16 (TPnCTL0.TPnCKS2-0) is selected in pulsewidth measurement mode, and a valid signal edge is input before the first countup, the a value of FFFFH will be captured in the corresponding TPnCCR0 orTPnCCR1 register.3. Pulse width measurement cannot be performed by timer P8 (TMP8).Remark: n = 0 to 7
