Fig. 10.18 Count Operation In One-Shot Mode (Operation Of Event Count Mode) - Fujitsu MB90420/5 (A) Series Hardware Manual

• Operation in one-shot mode
When the counter value underflows (0000
issued at this point when the underflow request flag bit (UF) is 1 and the interrupt request output enable bit
(INTE) is 1. Also, rectangular waves indicating that the count is in progress can be output from the TOT0/1
pin. Figure 10.18 shows the count operation in the one-shot mode.
TIN pin
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. 10.18 Count Operation in One-shot Mode (Operation of Event Count Mode)

Note: The width of the H or L of clock input to the TIN0/1 pin must be 4/φ or more.
16-BIT RELOAD TIMER
→ FFFF
H
Reload
–1 0000
H
data
T*
Start trigger input wait
), the counter stops at FFFF
H
Reload
FFFF –1
H
data
10-23
. An interrupt request is
H
0000 FFFF
H H