NEC V850E/PH2, User Manual

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Chapter 9 16-Bit Timer/Event Counter P
User’s Manual U16580EE3V1UD00
(3) Simultaneous pulse width and pulse space measurement
Pulse width and pulse space can be measure simultaneously in the pulse width measurement
mode, when the signal is input to both inputs TIPn0 and TIPn1, where both inputs detect opposite
edges. Alternatively the signal can be input to TIPn0 only, when the capture source input selection
for capture register 1 is used (ref. to
9.4 (7) TMP input control register 0 (TPIC0) and 9.4 (8)
TMP input control register 1 (TPIC1) ).
By detection of the specified edge the resulting values of pulse width or pulse space are captured
in the corresponding capture registers (TPnCCR0, TPnCCR1), and the timer is cleared and
restarts counting.
Figure 9-37: Flowchart of Simultaneous Pulse Width and Pulse Space Measurement
Note: External pulse input must be input to both TIPn0 and TIPn1, or to TIPn0 only, if the internal
connection between both inputs is selected.
Specify “rising edge” for edge detection of first input, and “falling edge” for the second input, or
vice versa.
Remark: n = 0 to 7
x = 0, 1
y = 0 when x = 1; y = 1 when x = 0
START
Initial settings
•
Clock selection
(TPnCTL0: TPnCKS2 to TPnCKS0)
•
Pulse width measurement mode setting
(TPnCTL1: TPnMD2 to TPnMD0 =
110B)
•
Capture register setting
(TPnCCR0, TPnCCR1)
Timer operation enable (TPnCE = 1)
Rising edge input to TIPnx, capture of
value to TPnCCRx, 16-bit counter clear
& start
TIPn1/TIPn0 edge detection setting
Note
(TPnIS3 to TPnIS0)
Falling edge input to TIPny, capture of
value to TPnCCRy, 16-bit counter clear
& start