Acer H15AAX, Service Manual

Page: 8 / 71

Circuit Description
H15AAX (AL502)
Page 5
9 . 3 . 2 F u n ct i o n s
C o n t ro l i s effect ed fo r t h e p u s h -s wi t ch es t o b e u s ed wh en t h e u s er ch an g es t h e p aram et ers , i n o rd er t o m o d i fy t h e
res p ec t i v e s et t i n g v al u es . W h et h er t h e s wi t ch h as b een p res s ed i s i d en t i f i ed wi t h t h e s wi t ch i n p u t l ev el t h at i s
t u rn ed “ L” .
Each s wi t ch i n p u t p o rt i s pu l l ed u p at o u t s i d e o f AS IC .
Each p aram et er i s s t o red i n t h e EEP R OM , t h e co n t en t s o f wh i ch are u p d a t ed as req u i red .
9 . 4 C o n t ro l o f d efi n i t i o n co n v ert er LS I I3 0 0 .
9 . 4 . 1 P o rt s rel at e d t o co n t ro l
P i n N o . I/O S i g n a l n a m e F u n c t i o n
1 5 9 I I R Q i n t e r r u p t s i g n a l
5 I/O S C L s e r i a l c l o c k
6 I/O S D A s e r i a l d a t a
9 . 4 . 2 F u n ct i o n s
M aj o r f u n ct i o n o f I 3 0 0 are as f o l l o ws :
(1 ) Ex p an s i o n o f t h e d i s p l ay s creen .
(2 ) Ti m i n g co n t ro l fo r v ari o u s s i g n al t y p es .
(3 ) P o wer -s u p p l y s e q u e n ce (LC D p an el ).
9 . 5 I
2
C b u s c o n t ro l
9 . 5 . 1 R el at ed p o rt s o f I3 0 3
P o r t P i n N o . I/O S i g n a l n a m e F u n c t i o n
P 1 . 7 1 4 O S C L I I C b u s c l o c k
P 1 . 6 1 3 I/O S D A I I C b u s d a t a
9 . 5 . 2 I
2
C - co n t ro l l ed fu n ct i o n s
Th e fo l l o wi n g fu n ct i o n al c o n t ro l s ar e effect ed b y I
2
C .
(1 ) C o n t ro l o f EEP R OM I3 0 4 fo r p aram et er s et t i n g .