Wiznet W7500 Reference Manual page 190

In one-shot mode, the Timer /Counter reset to the initial value and then stops when the
Timer/Counter reaches the value of limit register. Figure 24 shows one-shot mode timing
diagram.
PWMCLK
Prescale
1 2
Counter
Timer/Counter 10
Overflow
Interrupt
Counting mode
The Timer/Counter has two counting mode: Up-count and Down-count mode. In up-count
mode, the Timer/Counter counts up from 0 to the limit register value, then recycles. If
repetition mode is periodic, the Timer/Counter restarts, if repetition mode is one-shot mode,
the Timer/Counter stops. Figure 25 shows up-count mode timing diagram.
PWMCLK
Prescale
1 2
Counter
Timer/Counter 10
In Down-count mode, the Timer/Counter counts from 0xFFFF_FFFF, then recycles. If repetition
mode is periodic, the Timer/Counter restarts, if repetition mode is one-shot mode, the
Timer/Counter stops. Figure 26 shows down-count mode timing diagram.
PWMCLK
Prescale
1 2
Counter
Timer/Counter 15
Timer and Counter mode
W7500x Reference Manual Version1.1.0
Figure 23 Periodic mode
0 1 2 0 1
11 12
Figure 24 one-shot mode
0 1 2 0 1
11 12
Figure 25 Up-count mode
0 1 2 0 1
14 13
Figure 26 Down-count mode
2
2 0 1 2 0
13
2 0 1 2 0
12
0
0
1 2 0 1 2
14 15
1 2 0 1 2
11 10
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