SED1565 Datasheet, PDF (26/87 Pages) Epson Company – Direct display of RAM data through the display data RAM

SED1565 Series
DESCRIPTION OF FUNCTIONS
The MPU Interface
Selecting the Interface Type
With the SED1565 Series chips, data transfers are done
through an 8-bit bi-directional data bus (D7 to D0) or
through a serial data input (SI). Through selecting the P/
S terminal polarity to the “H” or “L” it is possible to
select either parallel data input or serial data input as
shown in Table 1.
P/S
H: Parallel Input
L: Serial Input
CS1 CS2
CS1 CS2
CS1 CS2
Table 1
A0 RD WR C86 D7 D6 D5~D0
A0 RD WR C86 D7 D6 D5~D0
A0 — — — SI SCL (HZ)
“—” indicates fixed to either “H” or to “L”
The Parallel Interface
When the parallel interface has been selected (P/S =
“H”), then it is possible to connect directly to either an
8080-system MPU or a 6800 Series MPU (as shown in
Table 2) by selecting the C86 terminal to either “H” or
to “L”.
Table 2
P/S
CS1 CS2 A0
H: 6800 Series MPU Bus CS1 CS2 A0
L: 8080 MPU Bus
CS1 CS2 A0
RD WR D7~D0
E R/W D7~D0
RD WR D7~D0
Moreover, data bus signals are recognized by a
combination of A0, RD (E), WR (R/W) signals, as
shown in Table 3.
Shared
A0
1
1
0
0
6800 Series
R/W
1
0
1
0
Table 3
8080 Series
RD
WR
0
1
1
0
0
1
1
0
Function
Reads the display data
Writes the display data
Status read
Write control data (command)
8–24
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