User`s manual

SPI Port

CS485xx Hardware User’s Manual

Figure 3-17. Sample Waveform for SPI Write Functional Timing

Figure 3-18. Sample Waveform for SPI Read Functional Timing

Notes: 1.IRQ remains low until the rising edge of the clock for the last bit of the last byte to be read from the SPI slave.

2.After going high, IRQ remains high until the CS

signal is raised to end the SPI transaction. If there are more bytes to read, IRQ will fall

after CS

has gone high.

SCP_CLK

CP_MOSI Data Byte 3 (MSB)7-bit Address

R/W

Data Byte 2 Data Byte 1 Data Byte 0 (LSB)

SCP_CS

SCP_CLK

CP_MOSI

D a ta B y te 3 (M S B )

7-bit A ddress

D a ta B y te 2 D a ta B y te 1 D a ta B y te 0 (L S B )

SCP_CS

CP_MISO

SCP_IRQ