19 UNIVERSAL SERIAL INTERFACE WITH LCD INTERFACE (USIL)
19-48
Seiko Epson Corporation
S1C33L26 TECHNICAL MANUAL
Note: This register is effective only in LCD parallel mode. Configure USIL to LCD parallel mode before
setting this register.
D[7:3]
Reserved
D2
LPSRDEN: Successive Read Enable Bit
Enables the successive read function.
1 (R/W): Enabled
0 (R/W): Disabled (default)
By issuing a read trigger (writing 1 to LPRD) after setting LPSRDEN to 1, the LCD parallel interface
repeats data reading from the LCD driver/panel while LPSRDEN is 1. When LPSRDEN is set to 0, the
LCD parallel interface stops data reading after the read cycle being currently executed has finished.
D1
LPCMD: Command bit
Sets the command bit value.
1 (R/W): High
0 (R/W): Low (default)
The command bit selected using LPCMD is output from the USIL_DI (lcdp_a0) pin.
D0
LPRD: Read Trigger Bit
Starts a read cycle of the LCD parallel interface.
1 (W):
Trigger (start reading)
0 (W):
Ignored
1 (R):
During reading
0 (R):
Read cycle has finished
To read data from the LCD driver/panel via the LCD parallel interface, issue a read trigger by writing
1 to LPRD. Set the command bit (LPCMD) value before writing to LPRD. The command bit value set
is output from the USIL_DI pin immediately after it is written to the register. Then it loads the LCD_
D[7:0] pin status to the read (receive data) buffer (RD[7:0]/USIL_RD register). LPRD retains 1 until
the read data is loaded to the read buffer.
USIL LCD Parallel I/F Mode Interrupt Enable Register (USIL_LPIE)
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
USIL LCD
Parallel I/F
Mode Interrupt
Enable Register
(USIL_LPIE)
0x300691
(8 bits)
D7–2 –
reserved
–
–
–
0 when being read.
D1
LPRDIE
Read buffer full interrupt enable
1 Enable
0 Disable
0
R/W
D0
LPWRIE
Write buffer empty interrupt enable 1 Enable
0 Disable
0
R/W
Note: This register is effective only in LCD parallel mode. Configure USIL to LCD parallel mode before
setting this register.
D[7:2]
Reserved
D1
LPRDIE: Read Buffer Full Interrupt Enable Bit
Enables interrupt requests to the ITC when data is loaded to the read (receive data) buffer.
1 (R/W): Enabled
0 (R/W): Disabled (default)
Set this bit to 1 to read data using interrupts.
D0
LPWRIE: Write Buffer Empty Interrupt Enable Bit
Enables interrupt requests to the ITC when data written to the write (transmit data) buffer is output via
the LCD_D[7:0] pins.
1 (R/W): Enabled
0 (R/W): Disabled (default)
Set this bit to 1 to write data to the write buffer using interrupts.