HMS81C43XX datasheet(63/100 Pages) HYNIX

Part #	HMS81C43XX

Description	CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR TELEVISION

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Manufacturer	HYNIX [Hynix Semiconductor]

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HMS81C43xx / GMS87C4060

63

November 2001 ver 1.2

18. I2C Bus Interface

The I2C Bus interface circuit is shown in Figure 18-1 .

The multi-master I2C Bus interface is a serial communica-

tions circuit, conforming to the Phlips I2C Bus data trans-

fer format. This interface, offering both arbitration lost

detection and a synchronous functions, is useful for the

multi-master serial communications.

This multi-master I2C Bus interface circuit consists of the

I2C address register, the I2C data shift register, the I2C

clock control register, the I2C control register, the I2C sta-

tus register and other control circuits.

The more details about registers are shown Figure 18-2 ~

Figure 18-6 .

Figure 18-1 Block Diagram of multi-master I2C circuit

Control

The HMS81C43xx/GMS87C4060 contains two I2C Bus

interface modules. It supports multi-master function, so it

contains arbitration lost detection, synchronization func-

tion,etc.

I2C address register

It contains slave address (7bit) which is used during slave

mode and Read/Write bit.

Bit 7 ~ 0 : Slave address 6~0

Note: Bit 7~0 (SAD6~0) store slave address. The address

data transmitted from the master is compared with the con-

tents of these bits.

ICAR [D8H]

IFI2CR

Bit counter

SCL

Address

comparator

ICDR [D9H]

D7

D6

D5

D4

D3

D2

D1

D0

Interrupt

Generation

Circuit

Data

Control

Circuit

ICSR [00DAH] MST TRX

BB

AL

AAS

AD0

LRB

Noise

Elimination

Circuit

AL

Circuit

BB

Circuit

Clock

Control

Circuit

Noise

Elimination

Circuit

ICCR1 [00DBH]

BSE L 1 ~ 0

ALS

ESO

BC 2 ~ 0

ICCR2 [DCH] ACLK ACK

1

C CR3 ~ 0

Clock division

External clock

SDA

SAD6 SDA5 SDA4 SDA3 SDA2 SDA1 SDA0 R/W

ITEM

Function

Format

Philips

I2C standard

7bit addressing format

Communication

mode

Master transmitter

Master receiver

Slave transmitter

Slave receiver

SCL clock

frequency

66.6KHz ~ 500KHz (fex=12MHz)

44.4KHz ~ 333.3KHz (fex=8MHz)

ITEM

Function

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