Cirrus Logic CS4953xx, Hardware User Manual

Page: 54 / 118

Cop
y
right
200
7 Cirrus
Log
ic (All
Rights
Res
e
rve
d
)
3- 2
0
SPI Port
C
S
495
3xx
H
a
rd
w
a
re
U
ser
s
Ma
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l
Figure 3-19. Sample Waveform for SPI Read Functional Timing
Figure 3-20. 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.
SCP1_CLK
SCP1_MOSI Data Byte 3 (MSB) 7-bit Address
R
/W
Data Byte 2 D
SCP1_CS
SCP1_CLK
SCP1_MOSI
Data Byte 3 (MSB)
7-bit Address
R
/W
Data Byte 2 Data Byte 1 Data Byte 0 (LSB)
SCP1_CS
SCP1_MISO
SCP1_IRQ