Fig. 10.15 Count Operation In One-Shot Mode (Operation Of External Trigger); Fig. 10.16 Count Operation In One-Shot Mode (Operation Of Software Gate Input) - Fujitsu MB90420/5 (A) Series Hardware Manual

• Operation of external trigger
The counter is started when the effective edge (rising edge, falling edge, or both edges) is input to the
TIN0/1 pin. Figure 10.15 shows the operation of the external trigger in the one-shot mode.
Count clock
Counter
Data load signal
UF Bit
CNTE Bit
TIN Pin
TO Pin
T : Machine cycle
* : It takes 2 T to 2.5 T time from inputting the external trigger to loading the reload data.

Fig. 10.15 Count Operation in One-shot Mode (Operation of External Trigger)

Note: The width of the trigger pulse input must be the TIN pin to 2/φ or more.
• Operation of gate input
Counting is performed while the effective level (H or L level) is input to the TIN pin. Figure 10.16 shows
the gate input operation in the one-shot mode.
Count clock
Counter
Data load signal
UF bit
CNTE bit
TRG bit
TO pin
T : Machine cycle
* : It takes 1 T time from inputting the trigger to loading the reload data.

Fig. 10.16 Count Operation in One-shot Mode (Operation of Software Gate Input)

Note: The width of the gate pulse input to the TIN pin must be 2/φ or more.
16-BIT RELOAD TIMER
Reload
–1 0000
data
2T to 2.5T*
Start trigger input wait
Reload
–1 0000
H
data
T*
Start trigger input wait
Reload
FFFF –1
H H data
Reload
FFFF –1
H
data
10-21
0000 FFFF
H H
0000 FFFF
H H