UPSD3422 datasheet(129/293 Pages) STMICROELECTRONICS

129 / 293 page

uPSD34xx

I2C interface

129/293

Set global variables to indicate Master-Xmitter

–

I2C_master = 1, I2C_xmitter = 0

Disable Master from returning an ACK

–

SFR S1CON.AA = 0

Enable I2C SIOE

–

SFR S1CON.INI1 = 1

Transmit Address and R/W bit = 1 to Slave

–

Is bus not busy? (SFR S1STA.BBUSY = 0?)

–

SFR S1DAT[7:0] = Load Slave Address # 01h

–

SFR S1CON.STA = 1, send START on bus

Enable All Interrupts and go do something else

–

SFR IE.EA = 1

Slave-Transmitter

Disable all interrupts

–

SFR IE.EA = 0

Set pointer to global data xmit buffer, set count

–

*xmit_buf = *pointer to data

–

buf_length = number of bytes to xmit

Set global variables to indicate Master-Xmitter

–

I2C_master = 0, I2C_xmitter = 1

Enable SIOE

–

SFR S1CON.INI1 = 1

Prepare to Xmit first data byte

–

SFR S1DAT[7:0] = xmit_buf[0]

Enable All Interrupts and go do something else

–

SFR IE.EA = 1

Slave-Receiver

Disable all interrupts

–

SFR IE.EA = 0

Set pointer to global data recv buffer, set count

–

*recv_buf = *pointer to data

–

buf_length = number of bytes to recv

Set global variables to indicate Master-Xmitter

–

I2C_master = 0, I2C_xmitter = 0

Enable SIOE

–

SFR S1CON.INI1 = 1

UPSD3422 Datasheet(PDF) 129 Page - STMicroelectronics

UPSD3422 Datasheet(HTML) 129 Page - STMicroelectronics

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