HT67F60 datasheet(175/242 Pages) HOLTEK

175 / 242 page

HT67F30/HT67F40/HT67F50/HT67F60

TinyPowerTM A/D Flash Type 8-Bit MCU with LCD & EEPROM

Rev. 1.50

174

March 06 , 2012

Rev. 1.50

175

March 06 , 2012

I2C Bus Communication

Communication on the I2C bus requires four separate steps, a START signal, a slave device address

transmission, a data transmission and finally a STOP signal. When a START signal is placed on the

I2C bus, all devices on the bus will receive this signal and be notified of the imminent arrival of data

on the bus. The first seven bits of the data will be the slave address with the first bit being the MSB.

If the address of the slave device matches that of the transmitted address, the HAAS bit in the

SIMC1 register will be set and an I2C interrupt will be generated. After entering the interrupt service

routine, the slave device must first check the condition of the HAAS bit to determine whether the

interrupt source originates from an address match or from the completion of an 8-bit data transfer.

During a data transfer, note that after the 7-bit slave address has been transmitted, the following bit,

which is the 8th bit, is the read/write bit whose value will be placed in the SRW bit. This bit will be

checked by the slave device to determine whether to go into transmit or receive mode. Before any

transfer of data to or from the I2C bus, the microcontroller must initialise the bus, the following are

steps to achieve this:

● Step 1

Set the SIM2~SIM0 and SIMEN bits in the SIMC0 register to "1" to enable the I2C bus.

● Step 2

Write the slave address of the device to the I2C bus address register SIMA.

● Step 3

Set the SIME and SIM Muti-Function interrupt enable bit of the interrupt control register to enable

the SIM interrupt and Multi-function interrupt.

St ar t

Wr it e Sl av e

A ddr e ss to S IM A

SE T SI M[ 2: 0] =1 10

SE T SI ME N

I 2 C Bu s

In te rr up t= ?

Ye s

SE T SI ME a nd MF nE

Wa it f or In te rr upt

Go to M ai n Pr og ra m

CL R SI ME

Po ll S IM F to d ec i de

wh en t o go t o I 2 C Bu s IS R

Go to M ai n Pr og ra m

I2C Bus Initialisation Flow Chart

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