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Contention between TCNT Write and Overflow/Underflow: If there is an up-count or down-
count in the T2 state of a TCNT write cycle, and overflow/underflow occurs, the TCNT write
takes precedence and the TCFV/TCFU flag in TSR is not set.
Figure 10-57 shows the operation timing when there is contention between TCNT write and
overflow.
ø
Address
Write signal
TCNT
TCFV flag
Figure 10-57 Contention between TCNT Write and Overflow
Multiplexing of I/O Pins: In the H8S/2646 Series, the TCLKA input pin is multiplexed with the
TIOCC0 I/O pin, the TCLKB input pin with the TIOCD0 I/O pin, the TCLKC input pin with the
TIOCB1 I/O pin, and the TCLKD input pin with the TIOCB2 I/O pin. When an external clock is
input, compare match output should not be performed from a multiplexed pin.
Interrupts and Module Stop Mode: If module stop mode is entered when an interrupt has been
requested, it will not be possible to clear the CPU interrupt source or the DTC activation source.
Interrupts should therefore be disabled before entering module stop mode.
TCNT write cycle
T1
T2
TCNT address
H'FFFF
TCNT write data
M
385
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