Lucent Technologies MN10285K - Manual (Page 123)

Timers
16-Bit Timer Setup Examples
Panasonic Semiconductor Development Company MN102H75K/F75K/85K/F85K LSI User Manual
122
Panasonic
■ To service the interrupts:
Run the interrupt service routine. The routine must determine the interrupt group,
then clear the interrupt request flag.
Either the TM5IA or TM5IB signal can control the timer 5 count direction. The
count direction is determined at the opposite edge from the count edge (at the
source clock transition occurring in the middle of the count cycle.).
Timer 5 does not operate in STOP mode, when B
OSC
is off. If you use an external
clock, it must be synchronized to B
OSC
.
Figure 4-51 shows an example timing chart. In this example, an interrupt occurs
when the timer switches from down to up counting.
Figure 4-51 External Count Direction Control Timing (Timer 5)
TM5CA
TM5CB
TM5BC
TM5IA
Interrupt
0000 1FFF 1FFF 1001 1000 0FFF 0002 0001 0000 1FFE 1FFE 1FFD
1FFF
1000
B
B OSC /4