11.5 Reset/set flip-flop
The "Reset/set flip-flop" function (RS-FF) is the same as the
function described in the section about "Set/reset flip-flop". The only
change is that the 1st source and 2nd source are interchanged.
The 1st source resets the output signal (1 to 0), and the 2nd source
sets the output signal (0 to 1).
See the figure below.
1st source/
reset
2nd
source/set
Action
Output signal
0
1
Set
1
1
0
Reset
0
1
1
Set
1
0
0
No change
Unchanged
signal
1
2
3
4
5
6
7
8
S
R
Q
TM046717
Logical Reset/set flip-flop function
Pos.
Description
1
1st source
2
2nd source
3
1st source
4
2nd source
5
Output signal
6
Output signal
7
Reset
8
Set
Related information
11.6 Toggle flip-flop
The "Toggle flip-flop" function (T-FF) is to be used together with a
timer function.
The 1st source has to be configured as "Constantly high", and the
2nd source has to be configured as "Timer function".
When both sources are high, the timer function is activated, and
after a selected time in seconds, the output signal changes status.
The output signal is unpredictable and depends on the following:
•
internal state of the Toggle flip-flop
•
actual output signal.
See the figure below.
1st source/set
2nd source/reset
Output signal
0
1
0
1
0
1
1
1
Undefined
0
0
Unchanged signal
1
2
3
4
5
6
Q
TM046718
Logical Toggle flip-flop function
Pos.
Description
1
1st source: Constantly high
2
2nd source: Timer function
3
1st source
4
2nd source
5
Output signal
6
Output signal
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