19 UNIVERSAL SERIAL INTERFACE WITH LCD INTERFACE (USIL)
19-2
Seiko Epson Corporation
S1C33L26 TECHNICAL MANUAL
Shift register
Receive data
buffer (1 byte)
Internal bus
ITC
USIL
Bus I/F
and
control
registers
USIL_CK
USIL_CS
Shift register
Transmit data
buffer (1 byte)
Clock/transfer control
Interrupt
control
USIL_DO
USIL_DI
LCD_D[7:0]
Transfer
clock source
(T8 Ch.3)
I/O
interface
1.1 USIL Configuration
Figure 19.
USIL Pins
19.2
Table 19.2.1 lists the USIL input/output pins.
2.1 List of USIL Pins
Table 19.
Pin name
USIL mode
Signal name
I/O
Function
USIL_DI
UART
uart_rx
I
Data input pin
Inputs serial data sent from an external serial device.
SPI master
spi_di
I
SPI slave
spi_di
I
I
2
C master
i2c_sda
I/O Data input/output pin
Inputs/outputs serial data from/to the I
2
C bus. (
*
)
I
2
C slave
i2c_sda
I/O
LCD SPI
lcds_a0
O
A0 signal output pin
Outputs the A0 signal to the LCD driver/panel.
LCD parallel
lcdp_a0
O
USIL_DO
UART
uart_tx
O
Data output pin
Outputs serial data sent to an external serial device.
SPI master
spi_do
O
SPI slave
spi_do
O
I
2
C master
–
–
Not used
I
2
C slave
–
–
LCD SPI
lcds_do
O
Data output pin
Outputs serial data sent to the LCD driver/panel.
LCD parallel
lcdp_wr
O
Write signal output pin
Outputs the write signal to the LCD driver/panel.
USIL_CK
UART
–
–
Not used
SPI master
spi_ck
O
Clock output pin
Outputs the SPI clock.
SPI slave
spi_ck
I
Clock input pin
Inputs an external clock.
I
2
C master
i2c_sck
I/O SCL input/output pin
Inputs SCL line status from the I
2
C bus. Also outputs the I
2
C clock.
I
2
C slave
i2c_sck
I/O SCL input/output pin
Inputs SCL line status from the I
2
C bus. Also outputs a clock stretch
condition.
LCD SPI
lcds_ck
O
Clock output pin
Outputs the SPI clock.
LCD parallel
lcdp_rd
O
Read signal output pin
Outputs the read signal to the LCD driver/panel.
USIL_CS
UART
–
–
Not used
SPI master
–
–
SPI slave
#spi_ss
I
SPI slave select signal input pin
Low level input to this pin selects USIL (in SPI slave mode) as an
SPI slave device.
I
2
C master
i2c_sda
I/O Data input/output pin
Inputs/outputs serial data from/to the I
2
C bus. (
*
)
I
2
C slave
i2c_sda
I/O
LCD SPI
–
–
Not used
LCD parallel
lcdp_cs
O
Chip select signal output pin
Outputs the chip select signal to the LCD driver/panel.