HT1380A HOLTEK [Holtek Semiconductor Inc], HT1380A Datasheet - Page 8

• Manufacturer Part Number: HT1380A
• Description: Serial Timekeeper Chip
• Manufacturer: HOLTEK [Holtek Semiconductor Inc]

Note: * In reading data byte from HT1380A/HT1381A register, the first data bit to be transmitted at the first falling
Rev. 1.00
edge after the last bit of the command byte is written.
T o d i s a b l e t h e w r i t e p r o t e c t
( W P = 0 ) b i t a n d e n a b l e t h e
o s c i l l a t o r ( C H = 0 )
b y s e t t i n g t h e M S B o f
E n a b l e t h e o s c i l l a t o r
o f r e g i s t e r 7 t o z e r o
c o m m a n d b y t e 8 0 H
b y s e t t i n g t h e M S B
p r o t e c t c o m m a n d
r e g i s t e r 0 t o z e r o
D i s a b l e t h e w r i t e
f r o m
R e s e t R E S T p i n
f r o m
R e s e t R E S T p i n
p r o t e c t b i t ( W P )
f r o m
f r o m
I n p u t t h e w r i t e
I n p u t t h e w r i t e
S e t R E S T p i n
S e t R E S T p i n
b y t e 8 E H
S T A R T
E N D
l o w t o h i g h
h i g h t o l o w
l o w t o h i g h
h i g h t o l o w
*
S i n g l e b y t e d a t a t r a n s f e r
b i t a n d e n a b l e t h e o s c i l l a t o r
c o r r e s p o n d i n g r e g i s t e r d a t a
D i s a b l e t h e w r i t e p r o t e c t
b y t e s t a r t i n g w i t h b i t 0
b y t e s t a r t i n g w i t h b i t 0
I n p u t t h e c o m m a n d
I f a n o t h e r r e g i s t e r
R e a d o r w r i t e t h e
R e s e t R E S T p i n
f r o m
f r o m
S e t R E S T p i n
i s a c c e s s e d
S T A R T
l o w t o h i g h
E N D
h i g h t o l o w
N o
8
Y e s
*
B u r s t m o d e d a t a t r a n s f e r
b i t a n d e n a b l e t h e o s c i l l a t o r
d a t a b y t e ( 6 4 d a t a b i t s ) i n
R e a d o r w r i t e a l l r e g i s t e r
t h e H T 1 3 8 1 s t a r t i n g w i t h
D i s a b l e t h e w r i t e p r o t e c t
c o m m a n d b y t e ( $ B E o r
$ B F ) s t a r t i n g w i t h b i t 0
I n p u t t h e b u r s t m o d e
HT1380A/HT1381A
b i t 0 o f r e g i s t e r 0
R e s e t R E S T p i n
f r o m
f r o m
S e t R E S T p i n
S T A R T
l o w t o h i g h
h i g h t o l o w
E N D
June 15, 2012