SONIX SN8P26L38, User Manual

Page: 116 / 136

SN8P26L38
8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 116
Version 1.5
The SIO supports 8-mode format controlled by MLSB, CPOL and CPHA bits.
The edge direction is “Data Transfer
Edge”. When setting rising edge, that means to receive and transmit one bit data at SCK rising edge, and data
transition is at SCK falling edge. When setting falling edge, that means to receive and transmit one bit data at SCK
falling edge, and data transition is at SCK rising edge.
“CPHA” is the clock phase bit controls the phase of the clock on which data is sampled. When CPHA=1, the SCK first
edge is for data transition, and receive and transmit data is at SCK 2
nd
edge. When CPHA=0, the 1
st
bit is fixed already,
and the SCK first edge is to receive and transmit data. The SIO data transfer timing as following figure:
M
L
S
B
C
P
O
L
C
P
H
A
Diagrams Description
0 0 1
bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
SCK idle status = Low.
The transfer first bit = MSB.
SCK data transfer edge = Falling
edge.
0 1 1
bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
SCK idle status = High.
The transfer first bit = MSB.
SCK data transfer edge = Rising
edge.
0 0 0
bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 Next data
SCK idle status = Low.
The transfer first bit = MSB.
SCK data transfer edge = Rising
edge.
0 1 0
bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 Next data
SCK idle status = High.
The transfer first bit = MSB.
SCK data transfer edge = Falling
edge.
1 0 1
bit0 bit1 bit2 bit3 bit4 bit5 bit6 Bit7
SCK idle status = Low.
The transfer first bit = LSB.
SCK data transfer edge = Falling
edge.
1 1 1
bit0 bit1 bit2 bit3 bit4 bit5 bit6 Bit7
SCK idle status = High.
The transfer first bit = LSB.
SCK data transfer edge = Rising
edge.
1 0 0
Next data bit0 bit1 bit2 bit3 bit4 bit5 bit6 Bit7
SCK idle status = Low.
The transfer first bit = LSB.
SCK data transfer edge = Rising
edge.
1 1 0
Next data bit0 bit1 bit2 bit3 bit4 bit5 bit6 Bit7
SCK idle status = High.
The transfer first bit = LSB.
SCK data transfer edge = Falling
edge.
SIO Data Transfer Timing