p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 266

• Manufacturer Part Number: p2125vps20
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 11 16-Bit Free-Running Timer (FRT)
11.5
11.5.1
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).
Rev. 1.00 Sep. 21, 2006 Page 228 of 658
REJ09B0310-0100
φ
External clock
input pin
FRC input
clock
FRC
Internal clock
FRC input
clock
FRC
φ
Operation Timing
FRC Increment Timing
Figure 11.4 Increment Timing with External Clock Source
Figure 11.3 Increment Timing with Internal Clock Source
N – 1
N
N
N + 1
N + 1