3069RF-ZTAT Datasheet, PDF (371/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

• Sample setup procedure for input capture
Figure 9.21 shows a sample procedure for setting up input capture.
Input selection
Select input-capture input
[1] Set TIOR to select the input capture function of a
general register and the rising edge, falling edge,
or both edges of the input capture signal. Clear the
DDR bit to 0 before making these TIOR settings.
[1]
Start counter
[2] [2] Set the STR bit in TSTR to 1 to make 16TCNT
start counting.
Input capture
Figure 9.21 Setup Procedure for Input Capture (Example)
• Examples of input capture
Figure 9.22 illustrates input capture when the falling edge of TIOCB and both edges of
TIOCA are selected as capture edges. 16TCNT is cleared by input capture into GRB.
16TCNT value
H'0180
H'0160
H'0005
H'0000
TIOCB
TIOCA
GRA
H'0005
H'0160
GRB
Figure 9.22 Input Capture (Example)
H'0180
Rev. 5.0, 09/04, page 349 of 978