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Mode 9 (internal clock): TRM = 0
N = write preload
M = write compare
TE
Clock
(CLK/2 or prescale CLK)
TLR
Counter (TCR)
TCPR
TCF (Compare Interrupt if TCIE = 1)
TOF (Overflow Interrupt if TOIE = 1)
float
TIO pin (INV = 0)
float
TIO pin (INV = 1)
TIO can connect to the RESET pin, internal hardware preserves the TIO value and
direction for an additional 2.5 clocks to ensure a reset of valid length.
(Software does not reset watchdog timer; watchdog times out)
first event
N
0
N
N + 1
M
low
high
Figure 9-18. Watchdog Pulse Mode
Triple Timer Module
TRM = 1 is not useful for watchdog function
M
M + 1
0
pulse width
= timer
clock period
Operating Modes
1
9-23
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