HD64F3437TF16 Datasheet, PDF (202/752 Pages) Hitachi Semiconductor – 12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.

8.4 Operation
8.4.1 FRC Increment Timing
FRC increments on a pulse generated once for each period of the selected (internal or external)
clock source. The clock source is selected by bits CKS0 and CKS1 in TCR.
Internal Clock: The internal clock sources (ø_P/2, ø_P/8, ø_P/32) are created from the system clock
(ø) by a prescaler. FRC increments on a pulse generated from the falling edge of the prescaler
output. See figure 8.4.
ø
Internal
clock
FRC clock
pulse
FRC
N–1
N
N+1
Figure 8.4 Increment Timing for Internal Clock Source
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