Samsung SGH-P400 Service Manual page 10

SG H- P400 Circuit Description
S o m e P P I p i n s h as m an y s p e c i a l f u n c t i o n s . CP _K B [ 0 ~ 9 ] r e c e i v e t h e s t a t u s
f r o m k e y F P C B a n d ar e u s e d f o r t h e c o m m u n i c at i o s u s i n g
I RD A ( I RD A _RX / T X / E N ) a n d d a t a l i n k
c a b l e (D E B U G _D T R/ RT S / T X D / RX D / C T S/ D S R) . A n d U P _C S / S C L K / S D I , c o n t r o l
s i g n al s f o r P S C 2 0 0 6 ar e o u t p u t t e d t h r o u g h P P I p i n s . I t h a s s i g n a l p o r t f o r
c h a r g i n g (C H G_D E T , C H G _S T A T 0 ), S I M _RE S E T an d F L I P _SN S w i t h w h i c h w e
k n o w s o p e n .c l o s e d s t at u s o f f o l d e r . I t h as JT A G c o n t r o l p i n s ( T D I / T D O / T C K )
f o r A RM c o r e an d D SP c o r e . I t r e c i e v e s 1 3 M H z c l o c k i n CK I p i n f r o m e x t e r n a l
T C X O a n d r e c e i v e s 3 2 .7 6 8 K H z c l o c k f r o m X 1 RT C. A D C (A n al o g t o D i g i t a l
Co n v e r t o r ) p a r t r e c e i v e s t h e s t a t u s o f t e m p e r at u r e , b at t e r y t y p e an d b at t e r y
v o l t ag e . A n d c o n t r o l s i g n a l s (D SP _I N T , D SP _I O a n d D S P _RW N ) f o r D SP c o r e a r e
u s e d . I t e n a b l e s m ai n L C D an d s m al l L C D w i t h D S P I P p i n s .
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