p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 324

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

Section 13 8-Bit Timer (TMR)
13.5
13.5.1
Figure 13.4 shows the TCNT count timing with an internal clock source. Figure 13.5 shows the
TCNT count timing with an external clock source. The pulse width of the external clock signal
must be at least 1.5 system clocks (φ) for a single edge and at least 2.5 system clocks (φ) for both
edges. The counter will not increment correctly if the pulse width is less than these values.
Rev. 1.00 Sep. 21, 2006 Page 286 of 658
REJ09B0310-0100
φ
Internal clock
TCNT input
clock
TCNT
φ
External clock
input pin
TCNT input
clock
TCNT
Operation Timing
TCNT Count Timing
Figure 13.5 Count Timing for External Clock Input (Both Edges)
Figure 13.4 Count Timing for Internal Clock Input
N – 1
N – 1
N
N
N + 1
N + 1