ST7565
DESCRIPTION OF FUNCTIONS
The MPU Interface
Selecting the Interface Type
With the ST7565 chips, data transfers are done through an
8-bit parallel 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.
Table 1
P/S
CS1
CS2
A0
RD
WR
C86
D7
D6
D5~D0
H: Parallel Input /CS1
CS2
A0
/RD
/WR
C86
D7
D6
D5~D0
L: Serial Input
/CS1
CS2
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 (shown in Table 2)
by selecting the C86 terminal to either “H” or to “L”.
C86 (P/S=H)
Table 2
CS1
CS2
A0
/RD
/WR D7~D0
H: 6800 Series
L: 8080 Series
/CS1 CS2
A0
E
R/W D7~D0
/CS1 CS2
A0
/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)
Ver 1.0a
12/56
2002/06/24