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RTC-72421/72423
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).
(2) ITRPT/STND bit (D
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
(3) t
(D
), t
(D
) bits
0
2
1
3
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
i. Setting t
and t
0
Setting these bits specifies the generation timing for fixed-period pulse output or fixed-period interrupts.
t
t
1
0
0
0
0
1
1
0
1
1
ii. STD.P pin output control
The timing of STD.P pin output is at the incrementation of the period specified by the t
)
1
T I
R
P
T
S /
T
N
D
0
1
1
P
r e
o i
d
f (
e r
q
u
e
n
c
) y
1
6 /
4
s
e
c
o
n
d
6 (
4
H
) z
1
s
e
c
o
n
d
1 (
H
) z
1
m
n i
u
e t
1 (
6 /
0
H
) z
1
h
o
r u
1 (
3 /
6
0
0
H
) z
O
F
x i
e
d
p -
r e
F
x i
e
d
p -
0
and t
bits.
0
1
n I
x i f
e
d
p -
r e
o i
d
p
u
s l
e
o
u
p t
s i
o l
w
f
r o
7
8 .
1
2
5
m
s
n (
o
e t
h t
t a
h
a
f l
h t
e
1
6 /
4
s -
e
Page-14
p
r e
t a
n i
g
m
o
d
e
o i
d
p
u
s l
e
o
u
p t
t u
m
o
d
e
r e
o i
d
i
t n
r e
u r
t p
m
o
d
e
and t
bits below.
1
R
e
m
a
k r
s
t u
m
o
d
, e
h t
e
S
T
D
P .
p
n i
o
c
o
n
d
p
r e
o i
d
s i
7
8 .
1
2
5
m
) s
and t
bits.
0
1
u
p t
t u
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