Epson RTC-72421 A, Applications Manual

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Page-14
RTC-72421/72423
(2) ITRPT/STND bit (D
1
)
The ITRPT/STND bit specifies fixed-period pulse output mode or fixed-period interrupt mode for the fixed-period
operating mode.
The mode selected by each setting of this bit is as follows:
For details of the timing of fixed-period operation, see the section on the t
0
and t
1
bits below.
(3) t
0
(D
2
), t
1
(D
3
) bits
These bits select the timing of fixed-period operation in fixed-period pulse output mode or fixed-period interrupt mode.
There is no special counter within the RTC for fixed-period operation; the fixed-period operation is performed at the
incrementation of the time (period) specified by the t
0
and t
1
bits.
i. Setting t
0
and t
1
Setting these bits specifies the generation timing for fixed-period pulse output or fixed-period interrupts.
ii. STD.P pin output control
The timing of STD.P pin output is at the incrementation of the period specified by the t
0
and t
1
bits.
t
1
t
0
) y c n e u q e r f ( d o i r e P s k r a m e R
0 0 ) z H 4 6 ( d n o c e s 4 6 / 1
t u p t u o n i p P . D T S e h t , e d o m t u p t u o e s l u p d o i r e p - d e x i f n I
s m 5 2 1 8 . 7 r o f w o l s i
) s m 5 2 1 8 . 7 s i d o i r e p d n o c e s - 4 6 / 1 e h t f l a h t a h t e t o n (
0 1 ) z H 1 ( d n o c e s 1
1 0 ) z H 0 6 / 1 ( e t u n i m 1
1 1 ) z H 0 0 6 3 / 1 ( r u o h 1
D N T S / T P R T I e d o m g n i t a r e p O
0 e d o m t u p t u o e s l u p d o i r e p - d e x i F
1 e d o m t p u r r e t n i d o i r e p - d e x i F
1. Fixed-period pulse output mode (ITRPT/STND=0)
The output levels of the STD.P pin are low (down) and open circuit (up).
2. Fixed-period interrupt mode (ITRPT/STND=1)
The output levels of the STD.P pin are low (down) and open circuit (up).