19 UNIVERSAL SERIAL INTERFACE WITH LCD INTERFACE (USIL)
19-44
Seiko Epson Corporation
S1C33L26 TECHNICAL MANUAL
D0
ISIF: Operation Completion Flag Bit
Indicates whether the triggered operation has completed or not.
1 (R):
Completed
0 (R):
Not completed (default)
1 (W):
Reset to 0
0 (W):
Ignored
ISIF is set to 1 when the operation that is specified and triggered using the USIL_ISTG register has
completed. At the same time an operation completion interrupt request is sent to the ITC if ISIE/USIL_
ISIE register is 1. ISIF is reset by writing 1.
USIL LCD SPI Mode Configuration Register (USIL_LSCFG)
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
USIL LCD SPI
Mode Configu-
ration Register
(USIL_LSCFG)
0x300680
(8 bits)
D7–4 –
reserved
–
–
–
0 when being read.
D3
LSCPHA
Clock phase select
1 Phase 1
0 Phase 0
0
R/W
D2
LSCPOL
Clock polarity select
1 Active L
0 Active H
0
R/W
D1
LSCMD
Command bit
1 High
0 Low
0
R/W
D0
LSCMDEN Command bit enable
1 Enable
0 Disable
0
R/W
Note: This register is effective only in LCD SPI mode. Configure USIL to LCD SPI mode before setting
this register.
D[7:4]
Reserved
D3
LSCPHA: Clock Phase Select Bit
Selects the LCD SPI clock phase.
1 (R/W): Phase 1
0 (R/W): Phase 0 (default)
Set the data transfer timing together with LSCPOL. (See Figure 19.8.2.)
D2
LSCPOL: Clock Polarity Select Bit
Selects the LCD SPI clock polarity.
1 (R/W): Active low
0 (R/W): Active high (default)
Set the data transfer timing together with LSCPHA. (See Figure 19.8.2.)
USIL_CK (LSCPOL = 1, LSCPHA = 1)
USIL_CK (LSCPOL = 1, LSCPHA = 0)
USIL_CK (LSCPOL = 0, LSCPHA = 1)
USIL_CK (LSCPOL = 0, LSCPHA = 0)
USIL_DO
Slave device data fetch timing
CMD
D7 (MSB)
D0 (LSB)
8.2 Clock and Data Transfer Timing
Figure 19.
D1
LSCMD: Command Bit
Sets the command bit value (see LSCMDEN below).
1 (R/W): High
0 (R/W): Low (default)
D0
LSCMDEN: Command Bit Enable Bit
Enables sending the command bit on the data line (USIL_DO).
1 (R/W): Enabled
0 (R/W): Disabled (default)
When LSCMDEN is set to 1, data is prefixed with a command bit (1 bit). The command bit is used for
controlling the SPI LCD driver/panel connected to the USIL. The command bit value to be transmitted
can be specified using LSCMD.