sc16is741ipw NXP Semiconductors, sc16is741ipw Datasheet - Page 37

• Manufacturer Part Number: sc16is741ipw
• Description: Single Uart With I2c-bus/spi Interface, 64 Bytes Of Transmit And Receive Fifos, Irda Sir Built-in Support
• Manufacturer: NXP Semiconductors

Fig 20. SPI operation
SCLK
SCLK
SCLK
SCLK
SO
SO
(1) Last bit (D0) of the last byte to be written to the transmit FIFO.
(2) Last bit (D0) of the last byte to be read from the receive FIFO.
a. Register write
b. Register read
d. FIFO read cycle
c. FIFO write cycle
SI
SI
SI
SI
R/W = 0; A[3:0] = register address; CH1 = 0, CH0 = 0
R/W = 1; A[3:0] = register address; CH1 = 0, CH0 = 0
R/W = 0; A[3:0] = 0000; CH1 = 0, CH0 = 0
R/W = 1; A[3:0] = 0000; CH1 = 0, CH0 = 0
R/W
R/W
R/W
R/W
A3
A3
A3
A3
A2
A2
A2
A2
A1
A1
A1
A1
A0
A0
A0
A0
CH1
CH1
CH1
CH1
CH0
CH0
CH0
CH0
X
X
X
X
D7
D7
D7
D7
D6
D6
D6
D6
D5
D5
D5
D5
D4
D4
D4
D4
D3
D3
D3
D3
D2
D2
D2
D2
D1
D1
D1
D1
D0
D0
D0
D0
D7
D7
D6
D6
D5
D5
D4
D4
D3
D3
D2
D2
D1
D1
D0
D0
last bit
last bit
(1)
(2)
002aab433
002aab434
002aab435
002aab436