HT46R232 datasheet(25/50 Pages) HOLTEK

25 / 50 page

HT46R232/HT46C232

Rev. 1.40

November 23, 2005

D a t a

S = S t a r t ( 1 b i t )

S A = S l a v e A d d r e s s ( 7 b i t s )

S R = S R W b i t ( 1 b i t )

M = S l a v e d e v i c e s e n d a c k n o w l e d g e b i t ( 1 b i t )

D = D a t a ( 8 b i t s )

A = A C K ( R X A K b i t f o r t r a n s m i t t e r , T X A K b i t f o r r e c e i v e r 1 b i t )

P = S t o p ( 1 b i t )

S C L

S t a r t

S D A

S R W

A C K

S t o p

S C L

S D A

S A

S R

S A

S R

S l a v e A d d r e s s

2C Communication Timing Diagram

Note:

1: Write the I

2C Bus address register (HADR) to define its own slave address.

2: Set HEN bit of I

2C Bus control register (HCR) bit 0 to enable the I2C Bus.

Bit No.

Label

Function

0~2

Unused bit, read as

²0²

TXAK

Enable/disable transmit acknowledge (0= acknowledge; 1= don

¢t acknowledge)

HTX

Defines the transmit/receive mode (0= receive mode; 1= transmit)

5~6

Unused bit, read as

²0²

HEN

Enable/disable I

2C Bus function (0= disable; 1= enable)

HCR (21H) Register

3: Set EHI bit of the interrupt control register 1 (INTC1) bit 0 to enable the I

2C Bus interrupt.

Bit No.

Label

Function

RXAK

RXAK is cleared to

²0² when the master receives an 8-bit data and acknowledgment

at the 9th clock, RXAK is set to

²1² means not acknowledged.

Unused bit, read as

²0²

SRW

SRW is set to

²1² when the master wants to read data from the I2C Bus, so the slave

must transmit data to the master. SRW is cleared to

²0² when the master wants to

write data to the I

2C Bus, so the slave must receive data from the master.

3~4

Unused bit, read as

²0²

HBB

HBB is set to

²1² when I2C Bus is busy and HBB is cleared to ²0² means that the I2C

Bus is not busy.

HAAS

HAAS is set to

²1² when the calling address has matched, and I2C Bus interrupt will

occur and HCF is set.

HCF

HCF is cleared to

²0² when one data byte is being transferred, HCF is set to ²1² indi-

cating 8-bit data communication has been finished.

HSR (22H) Register

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