S1D15E06 Series
6. FUNCTIONAL DESCRIPTION
6.1 MPU Interface
6.1.1 Selection of Interface Type
S1D15E06 series allows data to be sent via the 8-bit bi-directional data buses (D7 to D0) or serial data input (SI). By
setting the polarity of the P/S pin to HIGH or LOW, you can select either 8-bit parallel data input or serial data input,
as shown in Table 6.1.
Table 6.1
P/S
CS1
CS2
CS2
CS2
A0
A0
A0
RD
RD
—
WR
WR
—
C86
C86
—
D7
D7
SI
D6
D6
D5 to D0
D5 to D0
(HZ)
HIGH : Parallel input CS1
LOW : Serial input CS1
SCL
—: Fixed to HIGH or LOW HZ: High impedance state
6.1.2 parallel interface
When the parallel interface is selected (P/S = HIGH), direction connection to the MPU bus of either 80 series MPU or
68 series MPU is performed by setting the 86 pin to either HIGH or LOW, as shown in Table 6.2.
Table 6.2
P/S
CS1
CS1
CS1
CS2
CS2
CS2
A0
A0
A0
RD
E
WR
R/W
WR
D7 to D0
D7 to D0
D7 to D0
HIGH : 68 series MPU bus
LOW : 80 series MPU bus
RD
The data bus signals are identified by a combination of A0, RD (E), and WR (R/W) signals as shown in Table 6.3.
Table 6.3
Common 68 series
80 series
WR
Function
A0
1
R/W
RD
0
1
0
1
1
0
0
Display data read, status read
Display data write, command parameter write
Command write
1
1
0
1
6.1.3 Serial interface
When the serial interface is selected (P/S =LOW), the chip is active (CS1 = LOW, CS2 = HIGH), and reception of serial
data input (SI) and serial clock input (SCL) is enabled. Serial interface comprises a 8-bit shift register and 3-bit counter.
The serial data are latched by the rising edge of serial clock signals in the order of D7, D6, .... and D0 starting from the
serial data input pin. On the rising edge of 8th serial clock signal, they are converted into 8-bit parallel data to be
processed.
Whether serial data input is a display data or command is identified by A0 input. A0 = HIGH indicates display data,
while A0 = LOW shows command data. The A0 input is read and identified at every 8 × n-th rising edge of the serial
clock after the chip has turned active.
Fig. 6.1 shows the serial interface signal chart.
Rev. 2.1
EPSON
11
EPSON [ EPSON COMPANY ]
