XR20V2172 Datasheet, PDF (8/51 Pages) Exar Corporation – TWO CHANNEL I2C/SPI UART WITH 64-BYTE FIFO AND RS232 TRANSCEIVER

XR20V2172
PRELIMINARY
TWO CHANNEL I2C/SPI UART WITH 64-BYTE FIFO AND RS232 TRANSCEIVER
FIGURE 6. I²C DATA FORMATS
Master write: S
SLAVE
ADDRESS
START condition
Data transferred (n bytes + acknowledge)
WA
DATA
A
DATA
AP
write acknowledge
acknowledge
acknowledge STOP condition
Master read: S
SLAVE
ADDRESS
START condition
Data transferred (n bytes + acknowledge)
RA
DATA
A
DATA
NA P
read acknowledge
acknowledge
Not acknowledge STOP condition
REV. P1.0.1
Combined
formats:
S
SLAVE
ADDRESS
Data transferred (n bytes +
acknowledge)
R/W A
DATA
A Sr
SLAVE
ADDRESS
Data transferred (n bytes +
acknowledge)
R/W A
DATA
AP
START condition
Read or _acknowledge
write
acknowledge Repeated
START condition
Read or _acknowledge
write
Direction of transfer may
change at this point
acknowledge STOP condition
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