Chapter 1 Hardware Structure
32768Hz Crystal Oscillator Used for All Microcontroller Functions
(For HT49C30L, HT49C50L, HT49C70L only)
V
1 0 0 k
W
R E S
0 .1
m
F
D D
C O M 0 ~ C O M 3
S E G 0 ~ S E G 3 9
L C D
P A N E L
V L C D
0 .1
m
F
O S C 1
O S C 2
O S C 3
C 1
0 .1
m
F
C 2
V 1
0 .1
m
F
O S C 4
IN T 0
IN T 1
T M R 0
T M R 1
V 2
P A 0 ~ P A 7
P B 0 ~ P B 7
P C 0 ~ P C 7
H T 4 9 C 7 0 L
L C D P o w e r S u p p ly
( n o r m a lly c o n n e c te d to V
D D
)
Note
In this application drawing, the HT49C70L is taken as an example, however, this application can
also be applied to the HT49C30L and HT49C50L devices.
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