UPSD3422_V01 datasheet(136/300 Pages) STMICROELECTRONICS

136 / 300 page

Obsolete

Product(s)

- Obsolete

Product(s)

Obsolete

Product(s)

- Obsolete

Product(s)

I2C interface

UPSD3422, UPSD3433, UPSD3434, UPSD3454

136/300

Enable individual I2C interrupt and set priority

–

SFR IEA.I2C = 1

–

SFR IPA.I2C = 1 if high priority is desired

Set the Device address for Slave mode

–

SFR S1ADR = XXh, desired address

Enable SIOE (as Slave) to return an ACK signal

–

SFR S1CON.AA = 1

Master-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 = 1, I2C_xmitter = 1

Disable Master from returning an ACK

–

SFR S1CON.AA = 0

Enable I2C SIOE

–

SFR S1CON.INI1 = 1

Transmit Address and R/W bit = 0 to Slave

–

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

–

SFR S1DAT[7:0] = Load Slave Address & FEh

–

SFR S1CON.STA = 1, send Start on bus

Enable All Interrupts and go do something else

–

SFR IE.EA = 1

Master-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 = 1, I2C_xmitter = 0

Disable Master from returning an ACK

–

SFR S1CON.AA = 0

Obsolete

Product(s)

- Obsolete

Product(s)

UPSD3422 Datasheet(PDF) 136 Page - STMicroelectronics

UPSD3422 Datasheet(HTML) 136 Page - STMicroelectronics

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