HD6433682 ETC, HD6433682 Datasheet - Page 223

• Manufacturer Part Number: HD6433682
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series
• Manufacturer: ETC

2. TCNT count timing
Internal clock
A. Internal clock operation
B. External clock operation
TCNT input
TCNT
A system clock ( ) or three types of clocks ( /2, /4, or /8) that divides the system clock
can be selected by bits TPSC2 to TPSC0 in TCR.
Figure 13.10 illustrates this timing.
An external clock input pin (TCLK) can be selected by bits TPSC2 to TPSC0 in TCR, and
a detection edge can be selected by bits CKEG1 and CKEG0. To detect an external clock,
the rising edge, falling edge, or both edges can be selected. The pulse width of the external
clock needs two or more system clocks. Note that an external clock does not operate
correctly with the lower pulse width.
GR value
H'0000
STR
IMF
TCNT value
Figure 13.10 Count Timing at Internal Clock Operation
N-1
Figure 13.9 Periodic Counter Operation
Counter cleared by GR compare match
N
Rev. 3.00, 05/03, page 193 of 472
Time
N+1