UPSD3312D datasheet(136/272 Pages) STMICROELECTRONICS

136 / 272 page

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I2C interface

UPSD33xx

136/272

Doc ID 9685 Rev 7

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?)

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

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SFR S1CON.STA = 1, send START on bus

Enable All Interrupts and go do something else

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SFR IE.EA = 1

Slave-Transmitter

Disable all interrupts

●

SFR IE.EA = 0

Set pointer to global data xmit buffer, set count

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*xmit_buf = *pointer to data

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buf_length = number of bytes to xmit

Set global variables to indicate Master-Xmitter

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I2C_master = 0, I2C_xmitter = 1

Enable SIOE

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SFR S1CON.INI1 = 1

Prepare to Xmit first data byte

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

Enable All Interrupts and go do something else

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SFR IE.EA = 1

Slave-Receiver

Disable all interrupts

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SFR IE.EA = 0

Set pointer to global data recv buffer, set count

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*recv_buf = *pointer to data

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buf_length = number of bytes to recv

Set global variables to indicate Master-Xmitter

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I2C_master = 0, I2C_xmitter = 0

Enable SIOE

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SFR S1CON.INI1 = 1

Enable All Interrupts and go do something else

●

SFR IE.EA = 1

UPSD3312D Datasheet(PDF) 136 Page - STMicroelectronics

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