RX610 Group
17. 8-Bit Timer (TMR)
R01UH0032EJ0120 Rev.1.20
Page 575 of 1006
Feb 20, 2013
17.4
Operation Timing
17.4.1
TCNT Count Timing
Figure 17.5 shows the count timing of TCNT for internal clock input. Figure 17.6 shows the count timing of TCNT for
external clock input.
Note that the external clock pulse width must be at least 1.5 states for increment at a single edge, and at least 2.5 states
for increment at both edges. The counter will not increment correctly if the pulse width is less than these values.
Internal clock
TCNT
input clock
TCNT
PCLK
N-1
N
N+1
Figure 17.5 Count Timing for Internal Clock Input
External clock
input pin
TCNT
input clock
TCNT
PCLK
N-1
N
N+1
Figure 17.6 Count Timing for External Clock Input