Datasheet

Section 12 Timer Z
Rev. 4.00 Mar. 15, 2006 Page 189 of 556
REJ09B0026-0400
Figure 12.9 illustrates periodic counter operation.
H'0000
Time
Counter cleared by GR compare match
STR
GR value
TCNT value
IMF
Figure 12.9 Periodic Counter Operation
TCNT Count Timing:
• 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 12.10 illustrates this timing.
TCNT
TCNT input
Internal clock
N-1 N N+1
φ
Figure 12.10 Count Timing at Internal Clock Operation