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Chapter 10
Watch Timer
Preliminary User’s Manual U14913EE1V0UM00
Figure 10-3: Operation Timing of Watch Timer/Interval Timer
Notes:
1. f
SUB
= 4 MHz with fw of 31250 Hz [f
CKSEL1
] / 7812.5 Hz [f
CKSEL2
]
2. f
SUB
= 5 MHz with fw of 39062.5 Hz [f
CKSEL1
] / 9765.625 Hz [f
CKSEL2
]
Remarks: 1. fw: Watch timer clock frequency
2. n: Interval timer operation numbers
Start
5-bit counter
Overflow
Overflow
0H
Interrupt time of watch timer
Interrupt time of watch timer
Interval time (T)
Count clock f
W
or
f
W
/2
11
Watch timer
interrupt INTWT
Interval timer
interrupt INTWTI
nT
nT
Note
Note
Interval time (T)
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