hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 317

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

TCF Increment Timing
TCF is incremented by clock input (internal clock or external event input).
a. Internal clock operation
b. External event operation
TMOFH/TMOFL Output Timing
In TMOFH/TMOFL output, the value set in TOLH/TOLL in TCRF is output. The output is
toggled by the occurrence of a compare match. Figure 9.6 shows the output timing.
TMIF
(when IEG3 = 1)
Count input
clock
TCF
OCRF
Compare match
signal
TMOFH TMOFL
Bits CKSH2 to CKSH0 or CKSL2 to CKSL0 in TCRF select one of four internal clock
sources (φ/32, φ/16, φ/4, or φw/4) created by dividing the system clock (φ or φw).
External event input is selected by clearing CKSL2 to 0 in TCRF. TCF can increment on
either the rising or falling edge of external event input. External event edge selection is set by
IEG3 in the interrupt controller’s IEGR register. An external event pulse width of at least 2
system clocks (φ) is necessary. Shorter pulses will not be counted correctly.
φ
Figure 9.6 TMOFH/TMOFL Output Timing
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Rev. 7.00 Mar 10, 2005 page 275 of 652
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REJ09B0042-0700
Section 9 Timers
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