S1D1 Epson Electronics America, Inc., S1D1 Datasheet - Page 280
S1D1
Manufacturer Part Number
S1D1
Description
LCD Controller-driver With Built-in Character ROM
Manufacturer
Epson Electronics America, Inc.
Datasheet
1.S1D1.pdf
(612 pages)
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The Serial Interface
When the serial interface has been selected (P/S =
LOW) then when the chip is in active state (CS1 = LOW
and CS2 = HIGH) the serial data input (SI) and the serial
clock input (SCL) can be received. The serial data is
read from the serial data input pin in the rising edge of
the serial clocks D7, D6 through D0, in this order. This
data is converted to 8 bits parallel data in the rising edge
* When the chip is not active, the shift registers and the counter are reset to their initial states.
* Reading is not possible while in serial interface mode.
* Caution is required on the SCL signal when it comes to line-end reflections and external noise. We recommend that
The Chip Select
The S1D15605 Series chips have two chip select
terminals: CS1 and CS2. The MPU interface or the
serial interface is enabled only when CS1 = LOW and
CS2 = HIGH.
When the chip select is inactive, D0 to D7 enter a high
impedance state, and the A0, RD, and WR inputs are
inactive. When the serial interface is selected, the shift
register and the counter are reset.
Accessing the Display Data RAM and the
Internal Registers
Data transfer at a higher speed is ensured since the MPU
is required to satisfy the cycle time (
alone in accessing the S1D15605 Series. Wait time may
not be considered.
And, in the S1D15605 Series chips, each time data is
sent from the MPU, a type of pipeline process between
Rev. 2.4a
operation be rechecked on the actual equipment.
CS1
CS2
SI
SCL
A0
D7
1
t
CYC
D6
2
) requirement
D5
3
D4
4
EPSON
Figure 1
D3
5
D2
6
of the eighth serial clock for the processing.
The A0 input is used to determine whether or the serial
data input is display data or command data; when A0 =
HIGH, the data is display data, and when A0 = LOW
then the data is command data. The A0 input is read and
used for detection every 8th rising edge of the serial
clock after the chip becomes active.
Figure 1 is a serial interface signal chart.
LSIs is performed through the bus holder attached to the
internal data bus.
For example, when the MPU writes data to the display
data RAM, once the data is stored in the bus holder, then
it is written to the display data RAM before the next data
write cycle. Moreover, when the MPU reads the display
data RAM, the first data read cycle (dummy) stores the
read data in the bus holder, and then the data is read from
the bus holder to the system bus at the next data read
cycle.
There is a certain restriction in the read sequence of the
display data RAM. Please be advised that data of the
specified address is not generated by the read instruction
issued immediately after the address setup. This data is
generated in data read of the second time. Thus, a
dummy read is required whenever the address setup or
write cycle operation is conducted.
This relationship is shown in Figure 2.
D1
7
D0
8
D7
9
D6
10
D5
11
D4
12
S1D15605 Series
D3
13
D2
14
8–25
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