¡ Semiconductor
ML9052
FUNCTIONAL DESCRIPTION
MPU Interface
• Selection of interface type
The ML9052 carries out data transfer using either the 8-bit bi-directional data bus (D7 to D0) or
the serial data input line (SI). Either the 8-bit parallel data input or serial data input can be
selected as shown in Table 1 by setting the P/S pin to the "H" or the "L" level.
Table 1
P/S
H: Parallel Input
L: Serial Input
CS1
CS1
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)
SCL
A hyphen (—) indicates that the pin can be tied to the "H" or the "L" level.
• Parallel interface
When the parallel interface is selected, (P/S = "H"), it is possible to connect this LSI directly to the
MPU bus of either an 80-series MPU or a 68-series MPU as shown in Table 2 depending on
whether the pin C86 is set to the "H" or "L".
Table 2
P/S
CS1
CS1
CS1
CS2
CS2
CS2
A0
A0
A0
RD
E
WR D7 to D0
R/W D7 to D0
H: 68-Series MPU Bus
L: 80-Series MPU Bus
RD
WR
D7 to D0
The data bus signals are identified as shown in Table 3 below depending on the combination of
the signals A0, RD(E), and WR(R/W) of Table 2.
Table 3
Common 68-Series
80-Series
A0
1
R/W
RD
WR
1
Display Data Read
Display Data Write
Status Read
1
0
1
0
0
1
0
1
1
0
0
1
Control Data Write (command)
0
0
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