Datasheet

Section 9 Timers
Rev. 6.00 Aug 04, 2006 page 290 of 680
REJ09B0145-0600
4. TCF Clear Timing
TCF can be cleared by a compare match with OCRF.
5. Timer Overflow Flag (OVF) Set Timing
OVF is set to 1 when TCF overflows from H'FFFF to H'0000.
6. Compare Match Flag set Timing
The compare match flag (CMFH or CMFL) is set to 1 when the TCF and OCRF values match.
The compare match signal is generated in the last state during which the values match (when TCF
is updated from the matching value to a new value). When TCF matches OCRF, the compare
match signal is not generated until the next counter clock.
7. Timer F Operation Modes
Timer F operation modes are shown in table 9.10.
Table 9.10 Timer F Operation Modes
Operation
Mode Reset Active Sleep Watch Subactive Subsleep Standby
Module
Standby
TCF Reset Functions Functions Functions/
Halted*
Functions/
Halted*
Functions/
Halted*
Halted Halted
OCRF Reset Functions Held Held Functions Held Held Held
TCRF Reset Functions Held Held Functions Held Held Held
TCSRF Reset Functions Held Held Functions Held Held Held
Note: * When φ
w
/4 is selected as the TCF internal clock in active mode or sleep mode, since
the system clock and internal clock are mutually asynchronous, synchronization is
maintained by a synchronization circuit. This results in a maximum count cycle error of
1/φ (s). When the counter is operated in subactive mode, watch mode, or subsleep
mode, φ
w
/4 must be selected as the internal clock. The counter will not operate if any
other internal clock is selected.