I/O Pin Structures
The accompanying diagrams illustrate the internal structures of some generic I/O pin types. As
the exact logical construction of the I/O pin will differ from these drawings, they are supplied as a
guide only to assist with the functional understanding of the I/O pins. The wide range of pin-shared
structures does not permit all types to be shown.
W r i t e C o n t r o l R e g i s t e r
R e a d C o n t r o l R e g i s t e r
W r i t e D a t a R e g i s t e r
R e a d D a t a R e g i s t e r
D a t a B u s
W r i t e C o n t r o l R e g i s t e r
C h i p R e s e t
R e a d C o n t r o l R e g i s t e r
W r i t e D a t a R e g i s t e r
R e a d D a t a R e g i s t e r
T o A / D C o n v e r t e r
Rev. 2.50
HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
C o n t r o l B i t
D a t a B u s
D
Q
C K
Q
S
C h i p R e s e t
D a t a B i t
D
Q
C K
Q
S
M
U
X
S y s t e m
W a k e - u p
Generic Input/Output Structure
P u l l - H i g h
R e g i s t e r
C o n t r o l B i t
S e l e c t
D
Q
C K
Q
S
D a t a B i t
D
Q
C K
Q
S
M
U
X
A n a l o g
I n p u t
S e l e c t o r
A/D Input/Output Structure
98
A/D Flash MCU with EEPROM
V
P u l l - H i g h
D D
R e g i s t e r
S e l e c t
W e a k
P u l l - u p
P A o n l y
W a k e - u p S e l e c t
V
D D
W e a k
P u l l - u p
A C S 3 ~ A C S 0
I / O
p i n
A / D I n p u t P o r t
��ne 22� 20��
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