I/O Pin St�Uctu�Es - Holtek HT66F20-1 Manual

HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
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
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. 1.40
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
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 a t a B u s 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 C S 4 , A C S 2 ~ A C S 0
A/D Input/Output Structure
75
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
M
U
X
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
I / O p i n
A / D I n p u t P o r t
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