SN8F5708 datasheet(162/204 Pages) SONIX

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SN8F5708 Series

I2C

Datasheet Rev. 2.4

162

22.8

Sample Code

The following sample code demonstrates how to perform I2C with interrupt.

unsigned int I2CAddr;

unsigned int I2C_TXData0;

unsigned int I2C_TXDatan;

unsigned int I2C_RXData0;

unsigned int I2C_RXDatan;

void I2CInit(void)

{

P1M &= 0xCF;

// P14 & P15 as input

// configure I2C clock(T1)and enable I2C.

I2CCON |= 0xC3;

TMOD = 0x60;

// auto reload

TCON0 = 0x07; // Fosc/1

TH1 = 0xF6;

//400kHz

TL1 = 0xF6;

//400kHz or

TH1 = 0xD8;

//100kHz

TL1 = 0xD8;

//100kHz

TR1 = 1;

// enable I2C interrupt

EI2C = 1;

//enable global interrupt

EAL = 1;

I2CCON |= 0x20;

// START (STA) = 1

}

void I2cInterrupt(void) interrupt ISRI2c //0x43

{

switch (I2CSTA)

{

// tx mode

case 0x08:

I2CCON &= 0xDF;

// START (STA) = 0

I2CDAT = I2CAddr;

// Tx/Rx addr

break;

case 0x18:

// write first byte

I2CDAT = I2C_TXData0;

break;

case 0x28:

// write n byte

I2CDAT = I2C_TXDatan;

break;

case 0x30:

// STOP (STO)

I2CCON |= 0x10;

break;

rx mode

case 0x40:

// get slave addr

I2CCON |= 0x04;

// AA = 1

break;

case 0x50:

// read n byte

I2C_RXData0 = I2CDAT;

I2CCON &= 0xFB;

// AA = 0

break;

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