NEC PD78P214 Manuale Utente
151
Chapter 7 Timer/Counter Units
7
Fig. 7-54 TM1 Cleared after Capture Operations
Remark
D
n
: TM1 count value (n = 0, 1, 2, ...)
CLR10 = 0, CLR11 = 0, CM = 1
7.2.6 Sample Applications
(1) Interval timer operation (1)
By free running 8-bit timer 1 (TM1), and adding a value to a compare register (CR10, CR11) in an interrupt
handling routine, 8-bit timer/counter 1 can be used as an interval timer whose period is as long as the added
value. (See Fig. 7-55.)
handling routine, 8-bit timer/counter 1 can be used as an interval timer whose period is as long as the added
value. (See Fig. 7-55.)
In addition, 8-bit timer 1 (TM1) has two compare registers, so that interval timers with two types of periods
can be produced.
can be produced.
Fig. 7-56 shows the setting of control registers. Fig. 7-57 shows the setting procedure. Fig. 7-58 shows
interrupt handling.
interrupt handling.
N3
N2
N4
N5
N1
0H
TM1
count value
count value
Captured
Captured
Captured
Captured
N1
N2
N3
N4
INTP0
pin input
INTP0
interrupt request
Capture/compare
register (CR11)
Captured