PIN DESCRIPTION
Pin Name
8080 family interface
A0
0
1
0
1
RD
0
0
1
1
WR
1
1
0
0
Function
Function
Status flag read
Display data and cursor address read
Display data and parameter write
Command write
A0
6800 family interface
A0
0
1
0
1
R/W
1
1
0
0
E
1
1
1
1
Function
Status flag read
Display data and cursor address read
Display data and parameter write
Command write
RD or E
When the 8080 family interface is selected, this signal acts as the active-LOW read strobe. The
S1D13305 series output buffers are enabled when this signal is active.
When the 6800 family interface is selected, this signal acts as the active-HIGH enable clock.
Data is read from or written to the S1D13305 series when this clock goes HIGH.
When the 8080 family interface is selected, this signal acts as the active-LOW write strobe. The
bus data is latched on the rising edge of this signal.
WR or R/W
When the 6800 family interface is selected, this signal acts as the read/write control signal. Data
is read from the S1D13305 series if this signal is HIGH, and written to the S1D13305 series if
it is LOW.
Chip select. This active-LOW input enables the S1D13305 series. It is usually connected
to the output of an address decoder device that maps the S1D13305 series into the memory
space of the controlling microprocessor.
This active-LOW input performs a hardware reset on the S1D13305 series. It is a
Schmitt-trigger input for enhanced noise immunity; however, care should be taken to ensure
that it is not triggered if the supply voltage is lowered.
CS
RES
5.2.4. Display memory control
The S1D13305 series can directly access static RAM and
PROM. The designer may use a mixture of these two
Pin Name
VA0 to VA15
VD0 to VD7
VWR
VRD
types of memory to achieve an optimum trade-off be-
tween low cost and low power consumption.
Function
16-bit display memory address. When accessing character generator RAM or ROM, VA0 to
VA3, reflect the lower 4 bits of the S1D13305 series’s row counter.
8-bit tristate display memory data bus. These pins are enabled when VR/W is LOW.
Active-LOW display memory write control output.
Active-LOW display memory read control output.
VCE
Active-LOW static memory standby control signal. VCE can be used with CS.
6
EPSON
S1D13305 Series
Technical Manual
EPSON [ EPSON COMPANY ]
