15-8
Seiko Epson Corporation
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
15.3.3.
QSPI Clock (QSPICLK
n
) Phase and Polarity
The QSPICLK
n
phase and polarity can be configured separately using the QSPI_
n
MOD.CPHA bit and the
QSPI_
n
MOD.CPOL bit, respectively. Figure 15.3.3.1 shows the clock waveform and data input/output
timing in each set- ting.
Figure 15.3.3.1 QSPI Clock Phase and Polarity (QSPI_
n
MOD.LSBFST bit = 0, QSPI_
n
MOD.CHLN[3:0] bits =
0x7)
15.4.
Data Format
The QSPI data length can be selected from 2 to 16 clocks by setting the QSPI_
n
MOD.CHLN[3:0] bits. The
input/ output permutation is configurable to MSB first or LSB first using the QSPI_
n
MOD.LSBFST bit.
Figures 15.4.1 to
15.4.3 show data format examples in different transfer modes (QSPI_
n
MOD.TMOD[1:0]) when the
QSPI_
n
MOD. CPOL bit = 0 and the QSPI_
n
MOD.CPHA bit = 0.
Figure 15.4.1 Data Format Selection for Single Transfer Mode Using the QSPI_
n
MOD.LSBFST Bit
(QSPI_
n
MOD.TMOD[1:0] bits = 0x0, QSPI_
n
MOD.CHLN[3:0] bits = 0x7, QSPI_
n
MOD.CPOL bit = 0, QSPI_
n
MOD.CPHA bit = 0)
MSB
LSB
MSB
LSB
MSB
LSB
MSB
LSB
Writing data to the QSPI_
n
TXD register
QSPI_
n
MOD register
CPOL bit
CPHA bit
1
1
1
0
1
2
3
5
6
4
7
8
QSPICLK
n
QSPICLK
n
QSPICLK
n
QSPICLK
n
(Input)
QSDIO
n
Cycle No.
(Master mode, output)
QSDIO
n
(Slave mode, output)
QSDIO
n
(Slave mode, output)
QSDIO
n
0
1
0
0
x
x
x
x
x
1
x
0
Dw7
Dw6
Dw5
Dw4
Dw3
Dw2
Dw1
Dw0
Dr7
Dr6
Dr5
Dr4
Dr3
Dr2
Dr1
Dr0
Dw0
Dw1
Dw2
Dw3
Dw4
Dw5
Dw6
Dw7
Dr0
Dr1
Dr2
Dr3
Dr4
Dr5
Dr6
Dr7
Writing Dw[7:0] to the QSPI_
n
TXD register
Loading Dr[7:0] to the QSPI_
n
RXD register
QSPI_
n
MOD.
LSBFST bit
1
2
3
5
6
4
7
8
QSPICLK
n
QSDIOn0
QSDIOn1
QSDIOn0
Cycle No.
QSDIOn1
0
1
Summary of Contents for S1C31D50
Page 461: ...25 1 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 25 Package TQFP12 48PIN ...
Page 462: ...25 2 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 QFP13 64PIN ...
Page 463: ...25 3 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 TQFP14 80PIN ...
Page 464: ...25 4 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 QFP15 100PIN ...