Lucent Technologies MN10285K User Manual

Timers

16-Bit Timer Setup Examples

Panasonic Semiconductor Development Company

MN102H75K/F75K/85K/F85K LSI User Manual

122

Panasonic

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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

1001

1000

0FFF

0002

0001

0000

1FFE

1FFD

1FFF

1000

OSC