h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 352

• Manufacturer Part Number: h8s-2158
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 12 16-Bit Free-Running Timer (FRT)
12.5
12.5.1
Figure 12.3 shows the FRC increment timing with an internal clock source. Figure 12.4 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 ( ). The counter will not increment correctly if the pulse width is
shorter than 1.5 system clocks ( ).
Rev. 3.00 Jan 25, 2006 page 300 of 872
REJ09B0286-0300
External clock
input pin
FRC input
clock
FRC
Internal clock
FRC input
clock
FRC
FRC Increment Timing
Operation Timing
Figure 12.4 Increment Timing with External Clock Source
Figure 12.3 Increment Timing with Internal Clock Source
N – 1
N
N
N + 1
N + 1