15-33
Seiko Epson Corporation
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
15.8.
Control Registers
QSPI Ch.
n
Mode Register
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
QSPI_
n
MOD
15
–
12
CHDL[3:0]
0x7
H0
R/W
–
11
–
8
CHLN[3:0]
0x7
H0
R/W
7
–
6
TMOD[1:0]
0x0
H0
R/W
5
PUEN
0
H0
R/W
4
NOCLKDIV
0
H0
R/W
3
LSBFST
0
H0
R/W
2
CPHA
0
H0
R/W
1
CPOL
0
H0
R/W
0
MST
0
H0
R/W
Bits 15
–
12 CHDL[3:0]
These bits set the number of clocks to drive the serial output data lines. This setting is
required to output the XIP confirmation bit to Micron Flash memories or to output the
mode byte to Spansion Flash memories.
Table 15.8.1 Data Line Drive Length Settings
QSPI_
n
MOD.CHDL[3:0] bits
Data line drive length
0xf
16 clocks
0xe
15 clocks
0xd
14 clocks
0xc
13 clocks
0xb
12 clocks
0xa
11 clocks
0x9
10 clocks
0x8
9 clocks
0x7
8 clocks
0x6
7 clocks
0x5
6 clocks
0x4
5 clocks
0x3
4 clocks
0x2
3 clocks
0x1
2 clocks
0x0
1 clock
These bits must be set to a value smaller than or equal to the QSPI_
n
MOD.CHLN[3:0] bit
setting.
Note:
When using the QSPI in slave mode, the QSPI_
n
MOD.CHDL[3:0] bits should be set to the
same value as the QSPI_
n
MOD.CHLN[3:0] bits.
Summary of Contents for S1C31D50
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