xr20m1172 Exar Corporation, xr20m1172 Datasheet - Page 8

• Manufacturer Part Number: xr20m1172
• Description: Two Channel I2c/spi Uart With 64-byte Fifo
• Manufacturer: Exar Corporation

XR20M1172
TWO CHANNEL I2C/SPI UART WITH 64-BYTE FIFO
F
IGURE
Master write:
Master read:
Combined
formats:
START condition
START condition
START condition
6. I
2
S
S
S
C D
ATA
ADDRESS
ADDRESS
ADDRESS
SLAVE
SLAVE
SLAVE
F
ORMATS
Read or
R/W
write
write
read
W
R
acknowledge
acknowledge
acknowledge
A
A
A
Data transferred (n bytes +
DATA
DATA
DATA
acknowledge)
Data transferred (n bytes + acknowledge)
Data transferred (n bytes + acknowledge)
acknowledge
acknowledge
acknowledge
A
A
A
8
Repeated
START condition
Sr
DATA
DATA
ADDRESS
Not acknowledge
SLAVE
acknowledge
Direction of transfer may
NA
A
Read or
write
change at this point
R/W
STOP condition
STOP condition
P
P
acknowledge
A
Data transferred (n bytes +
DATA
acknowledge)
acknowledge
A
STOP condition
REV. 1.0.0
P