HT82K75REW datasheet(37/103 Pages) HOLTEK

37 / 103 page

HT82M75REW/HT82K75REW

Rev. 1.00

June 11, 2010

SPI Configuration Options and Status Control

One option is to enable the operation of the WCOL, write collision bit, in the SBCR register. Some control in SPIR register.

The SPI_CPOL select the clock polarity of the SCK line . The SPI_MODE select SPI data output mode.

SPI include four pins , can share I/O mode status . The status control combine with four bits for SPIR and SBCR regis-

ter. Include SPI_CSEN , SPI_EN for SPIR register and CSEN ,SBEN for SBCR register.

SPIR(22H)

SBCR(23H)

I/O Status

Note

SPI_EN

SPI_CSEN

SBEN

CSEN

SPI

SCS

I/O mode

SPI mode

I/O mode

SCS not Floating

SPI mode

I/O mode

SCS not Floating

SPI mode

SCS mode

The SPI enable, SCS, SDI,

SDO, SCK the internal

Pull-high function is invalid.

Note:

X: don

¢t care

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.

S B C R R e g i s t e r

b 7

b 0

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

T r a n s m i t t / R e c e i v e f l a g

0 : N o t c o m p l e t e

1 : T r a n s m i s s i o n / r e c e p t i o n c o m p l e t e

W r i t e c o l l i s i o n b i t

0 : C o l l i s i o n f r e e

1 : C o l l i s i o n d e t e c t e d

S e l e c t i o n s i g n a l e n a b l e / d i s a b l e b i t

0 : S C S f l o a t i n g f o r I / O m o d e

1 : E n a b l e

M S B / L S B f i r s t b i t

0 : L S B s h i f t f i r s t

1 : M S B s h i f t f i r s t

S e r i a l B u s e n a b l e / d i s a b l e b i t

0 : D i s a b l e

1 : E n a b l e

M a s t e r / S l a v e / B a u d r a t e b i t s

M a s t e r , b a u d r a t e : f S P I

M a s t e r , b a u d r a t e : f S P I / 4

M a s t e r , b a u d r a t e : f S P I / 1 6

S l a v e m o d e

M 1

M 0

C l o c k s o u r c e s e l e c t b i t

0 : f S P I = f S Y S / 2

1 : f S P I = f S Y S

SPI Interface Control Register

HT82K75REW датащи(PDF) 37 Page - Holtek Semiconductor Inc

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