Fig. 10.12 Count Operation In Reload Mode (Operation Of External Trigger); Fig. 10.13 Count Operation In Reload Mode (Operation Of Software Trigger And Gate Input) - Fujitsu MB90420/5 (A) Series Hardware Manual

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

Fig. 10.12 Count Operation in Reload Mode (Operation of External Trigger)

Note: The trigger pulse input to the TIN pin must be 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 10.13 shows
the gate input operation in the reload mode.
Count clock
Counter
Data load signal
UF Bit
CNTE bit
TRG bit
TIN pin
TOT pin
T : Machine cycle
* : It takes 1 T time from inputting the trigger to loading the reload data.

Fig. 10.13 Count Operation in Reload Mode (Operation of Software Trigger and Gate Input)

Note: The width of the gate pulse input to the TIN0/1 pin must be 2/φ or more.
16-BIT RELOAD TIMER
Reload
–1 0000
data
2T to 2.5T*
Reload data –1
T*
Reload Reload
–1 0000
H H
data data
Reload
–1 –1 0000
H
data
10-19
Reload
–1 0000 –1
H
data
–1 –1