HT86AR72 datasheet(47/68 Pages) HOLTEK

47 / 68 page

HT86Axx/HT86ARxx

Rev. 1.00

March 19, 2010

SPI Serial Interface

The device includes a single SPI Serial Interfaces. The

SPI interface is a full duplex serial data link, originally

connected to the same SPI bus to communicate with

each other. The devices communicate using a mas-

ter/slave technique where only the single master device

can initiate a data transfer. A simple four line signal bus

is used for all communication. The four SPI lines are

shared with I/O pins PD0~PD3, the function of which is

chosen using a configuration option.

SPI Interface Communication

Four lines are used for SPI communication known as

SDI - Serial Data Input, SDO - Serial Data Output, SCK -

Serial Clock and SCS - Slave Select. Note that the con-

dition of the Slave Select line is conditioned by the

CSEN bit in the SBCR control register. If the CSEN bit is

high then the SCS line is active while if the bit is low then

the SCS line will be in a floating condition. The following

timing diagram depicts the basic timing protocol of the

SPI bus.

D 7 D 6 D 5 D 4 D 3 D 2 D 1 D 0

S B D R ( R e c e i v e d D a t a R e g i s t e r )

S D O B u f f e r

M L S

D a t a B u s

M a s t e r o r S l a v e

S D I

S D O

I n t e r n a l B a u d R a t e C l o c k

S C K

C l o c k P o l a r i t y

C 2

C 1

C 0

S B E N

I n t e r n a l B u s y F l a g

S B E N

W r i t e S B D R

W C O L F l a g

T R F

a n d , s t a r t

S B E N

E N

A N D

W r i t e S B D R

W r i t e S B D R E n a b l e / D i s a b l e

S C S

E N

M a s t e r o r S l a v e

C S E N

S B E N

a n d , s t a r t

SPI Block Diagram

S B C R

D E F A U L T

S B D R

D E F A U L T

N o t e : " U " m e a n s u n c h a n g e d .

C K S

M 1

M 0

S B E N

M L S

C S E N

W C O L

T R F

D 7

D 6

D 5

D 4

D 3

D 2

D 1

D 0

D 7

D 6

D 5

D 4

D 3

D 2

D 1

D 0

S B C R : S E R I A L B U S

C O N T R O L R E G I S T E R

S B D R : S E R I A L B U S

D A T A R E G I S T E R

D 7 / D 0

D 6 / D 1

D 5 / D 2

D 4 / D 3

D 3 / D 4

D 2 / D 5

D 1 / D 6

D 0 / D 7

S D O

D 7 / D 0

D 6 / D 1

D 5 / D 2

D 4 / D 3

D 3 / D 4

D 2 / D 5

D 1 / D 6

D 0 / D 7

S D I

S C K

S C S

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