HT46C23 datasheet(22/48 Pages) HOLTEK

22 / 48 page

HT46R23/HT46C23

Rev. 1.60

May 3, 2004

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 I

2C Bus.

Label

(HCR)

Bits

Function

HEN

To enable or disable I

2C Bus function

(0= disable; 1= enable)

6~5

Unused bit, read as

²0²

HTX

To define the transmit/receive mode

(0= receive mode; 1= transmit)

TXAK

To enable or disable transmit acknowl-

edge

(0=acknowledge; 1=don

¢t acknowledge)

2~0

Unused bit, read as

²0²

HCR Register

3. Set EHI bit of the interrupt control register 1 (INTC1)

bit 0 to enable the I

2C Bus interrupt.

Label

(HSR)

Bits

Function

HCF

HCF is clear to

²0² when one data byte is

being transferred, HCF is set to

²1² indi-

cating 8-bit data communication has

been finished.

HAAS

HAAS is set to

²1² when the calling ad-

dress has matched, and I

2C Bus inter-

rupt will occur and HIF is set.

HBB

HBB is set to

²1² when I2C Bus is busy

and HBB is cleared to

²0² means that the

2C Bus is not busy.

4~3 Unused bit, read as

²0²

SRW

SRW is set to

²1² when the master wants

to read data from the I

2C 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.

Unused bit, read as

²0²

RXAK

RXAK is cleared to

²0² when the master

receives an 8-bit data and acknowledg-

ment at the 9th clock, RXAK is set to

²1²

means not acknowledged.

HSR Register

S t a r t

W r i t e S l a v e

A d d r e s s t o H A D R

S E T H E N

I 2 C B u s

I n t e r r u p t = ?

E n a b l e

D i s a b l e

S E T E H I

W a i t f o r I n t e r r u p t

G o t o M a i n P r o g r a m

C L R E H I

P o l l H I F t o d e c i d e

w h e n t o g o t o I 2 C B u s I S R

G o t o M a i n P r o g r a m

HT46C23 Datasheet(PDF) 22 Page - Holtek Semiconductor Inc

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