HT82K70E-L datasheet(37/59 Pages) HOLTEK

37 / 59 page

HT82K70E-L/HT82K70A-L/HT82K76E-L

Rev. 1.20

February 1, 2011

S B E N = 1

W r i t e D a t a i n t o

S B D R

W C O L = 1 ?

C l e a r W C O L

Y e s

N o

r e a d d a t a f r o m

S B D R

c l e a r T R F

T r a n s f e r

F i n i s h e d ?

E N D

M a s t e r o r

S l a v e

M a s t e r

S l a v e

[ M 1 , M 0 ] = 1 1

S P I T r a n s f e r

[ M 1 , M 0 ] = 0 0 , 0 1 , 1 0

S e l e c t c l o c k [ C K S ]

C o n f i g u r e

C S E N a n d M L S

T r a n s m i s s i o n

C o m p l e t e d ?

( T R F = 1 ? )

Y e s

N o

SPI Transfer Control Flowchart

SPI Transfer Control FlowChart

Error Detection

The WCOL bit in the SBCR register is provided to indi-

cate errors during data transfer. The bit is set by the Se-

rial Interface but must be cleared by the application

program. This bit indicates a data collision has occurred

which happens if a write to the SBDR register takes

place during a data transfer operation and will prevent

the write operation from continuing. The bit will be set

high by the Serial Interface but has to be cleared by the

user application program. The overall function of the

WCOL bit can be disabled or enabled by a configuration

option.

Programming Considerations

When the device is placed into the Power Down Mode

note that data reception and transmission will continue.

The TRF bit is used to generate an interrupt when the

data has been transferred or received.

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