Datasheet

Section 14 Timer Z
Rev. 3.00 Mar. 15, 2006 Page 239 of 526
REJ09B0060-0300
Figure 14.9 illustrates periodic counter operation.
H'0000
Time
Counter cleared by GR compare match
STR
GR value
TCNT value
IMF
Figure 14.9 Periodic Counter Operation
2. TCNT count timing
A. Internal clock operation
A system clock (φ) or three types of clocks (φ/2, φ/4, or φ/8) that divides the system clock
can be selected by bits TPSC2 to TPSC0 in TCR.
Figure 14.10 illustrates this timing.
TCNT
TCNT input
Internal clock
N-1 N
N+1
φ
Figure 14.10 Count Timing at Internal Clock Operation