xr20m1280 Exar Corporation, xr20m1280 Datasheet - Page 10

• Manufacturer Part Number: xr20m1280
• Description: I2c/spi Uart With 128-byte Fifo And Integrated Level Shifters
• Manufacturer: Exar Corporation

XR20M1280
I2C/SPI UART WITH 128-BYTE FIFO AND INTEGRATED LEVEL SHIFTERS
The 128 byte TX FIFO can be loaded with data or 128 byte RX FIFO data can be unloaded in one SPI write or
read sequence..
After the last read or write transaction, the SPI master will set the SCL signal back to its idle state (LOW).
F
F
IGURE
IGURE
SI
SO
SCL
SCL
SI
8. SPI FIFO W
9. SPI FIFO R
R/W ‘0’
R/W ‘0’
A2
A2
A1
A1
EAD
RITE
A0
A0
‘0’
‘0’
‘0’
‘0’
X
X
D7
D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0
D6
D5
PRELIMINARY
D4
D3
10
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
last bit
last bit
REV. P1.1.1