Operation Timing; Frc Increment Timing; Figure 11.3 Increment Timing With Internal Clock Source; Figure 11.4 Increment Timing With External Clock Source - Renesas H8S Series Hardware Manual

Section 11 16-Bit Free-Running Timer (FRT)
11.5

Operation Timing

11.5.1

FRC Increment Timing

Figure 11.3 shows the FRC increment timing with an internal clock source. Figure 11.4 shows the
increment timing with an external clock source. The pulse width of the external clock signal must
be at least 1.5 system clocks (φ). The counter will not increment correctly if the pulse width is
shorter than 1.5 system clocks (φ).
φ
Internal clock
FRC input
clock
FRC

Figure 11.3 Increment Timing with Internal Clock Source

φ
External clock
input pin
FRC input
clock
FRC

Figure 11.4 Increment Timing with External Clock Source

Rev. 3.00 Jul. 14, 2005 Page 290 of 986
REJ09B0098-0300
N – 1
N
N
N + 1
N + 1