XR20M1172G28-0B Datasheet, PDF (51/55 Pages) Exar Corporation – TWO CHANNEL I2C/SPI UART WITH 64-BYTE FIFO

REV. 1.2.0
FIGURE 32. SPI WRITE THR TO CLEAR TX INT
CS#
XR20M1172
TWO CHANNEL I2C/SPI UART WITH 64-BYTE FIFO
SCLK
SI
R/W A3
A2
A1
A0
0
CH
X
D7 D6 D5 D4 D3 D2 D1 D0
G P IO x
td11
IR Q #
FIGURE 33. READ MSR TO CLEAR MODEM INT
CS#
SCLK
SI
R/W A3 A2 A1 A0
0
CH
X
SO
IR Q #
D7 D6 D5 D4 D3 D2 D1 D0
TD12
51