HD64F2168 Datasheet, PDF (367/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

12.7 Input Capture Operation
TMR_X has input capture registers (TICR, TICRR and TICRF). A narrow pulse width can be
measured with TICRR and TICRF, using a single capture. If the falling edge of TMRIX (TMR_X
input capture input signal) is detected after its rising edge has been detected, the value of TCNT_X
at that time is transferred to both TICRR and TICRF.
Input Capture Signal Input Timing: Figure 12.11 shows the timing of the input capture
operation.
φ
TMRIX
Input capture
signal
TCNT_X
n
n+1
N
N+1
TICRR
M
n
n
TICRF
m
m
N
Figure 12.11 Timing of Input Capture Operation
If the input capture signal is input while TICRR and TICRF are being read, the input capture
signal is delayed by one system clock (φ) cycle. Figure 12.12 shows the timing of this operation.
Rev. 3.00, 03/04, page 327 of 830