7721 Datasheet, PDF (148/577 Pages) List of Unclassifed Manufacturers – H Bridge Power Module

TIMER A
8.5 One-shot pulse mode
8.5 One-shot pulse mode
In this mode, the timer outputs a pulse which has an arbitrary width once. (Refer to “Table 8.5.1.”) Timers
A2 to A4 can be used in this mode. When a trigger occurs, the timer outputs “H” level from the TAjOUT pin
for an arbitrary time. Figure 8.5.1 shows the structures of the timer Aj mode register and timer Aj register
in the one-shot pulse mode.
Table 8.5.1 Specifications of one-shot pulse mode
Item
Specifications
Count source
f2, f16, f64, or f512
Count operation
q Countdown
q When the counter value becomes “000016,” reload register’s con-
tents are reloaded, and counting stops.
q If a trigger occurs during counting, reload register’s contents are
reloaded, and counting continues.
Output pulse width (“H”)
n _[S]
fi
n : Timer Aj register’s set value
Count start condition
Count stop condition
q When a trigger occurs. (Note)
q Internal or external trigger can be selected by software.
q When the counter value becomes “000016^,”
q When the count start bit is cleared to “0”
Interrupt request occurrence timing
TAjIN pin’s function
TAjOUT pin’s function
Read from timer Aj register
Write to timer Aj register
When counting stops.
Programmable I/O port or trigger input
One-shot pulse output
An undefined value is read out.
q While counting is stopped
When a value is written to the timer Aj register, it is written to both
of the reload register and counter.
q While counting is in progress
When a value is written to the timer Aj register, it is written only to
the reload register. (Transferred to the counter at the next reload
time.)
Note: The trigger is generated with the count start bit = “1.”
7721 Group User’s Manual
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