HT66F20 datasheet(153/250 Pages) HOLTEK

153 / 250 page

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Rev. 1.20

153

June 4, 2010

The SIMD register is used to store the data being transmitted and received. The same register is used by both the SPI

and I

2C functions. Before the device writes data to the SPI bus, the actual data to be transmitted must be placed in the

SIMD register. After the data is received from the SPI bus, the device can read it from the SIMD register. Any transmis-

sion or reception of data from the SPI bus must be made via the SIMD register.

· SIMD Register

Bit

76543210

Name

R/W

POR

xxxxxxxx

²x² unknown

· SIMA Register

Bit

76543210

Name

IICA6

IICA5

IICA4

IICA3

IICA2

IICA1

IICA0

R/W

POR

xxxxxxx

²x² unknown

Bit 7~1

IICA6~ IICA0:I

2C slave address

IICA6~ IICA0 is the I

2C slave address bit 6~ bit 0.

The SIMA register is also used by the SPI interface but has the name SIMC2. The SIMA

SIMA register define the device slave address. Bit 0 is not defined.

When a master device, which is connected to the I

2C bus, sends out an address, which

matches the slave address in the SIMA register, the slave device will be selected. Note that the

SIMA register is the same register address as SIMC2 which is used by the SPI interface.

Bit 0

Undefined bit

This bit can be read or written by user software program.

I 2 C D a t a R e g i s t e r

( S I M D )

S l a v e A d d r e s s R e g i s t e r

( S I M A )

S h i f t R e g i s t e r

D i r e c t i o n C o n t r o l

A d d r e s s M a t c h

H A A S B i t

I 2 C I n t e r r u p t

D a t a i n L S B

D a t a O u t M S B

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

C o n t r o l U n i t

8 - b i t D a t a C o m p l e t e

D e t e c t S t a r t o r S t o p

D a t a B u s

A d d r e s s

C o m p a r a t o r

E n a b l e / D i s a b l e A c k n o w l e d g e

R e a d / w r i t e S l a v e

S R W B i t

H B B B i t

H T X B i t

S C L P i n

S D A P i n

H C F B i t

2C Block Diagram

HT66F20 Datasheet(PDF) 153 Page - Holtek Semiconductor Inc

HT66F20 Datasheet(HTML) 153 Page - Holtek Semiconductor Inc

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