Datasheet

DEP 20203-Y Production Specification
Version: 1 PAGE: 7
16 R/W#(WR#) I This pin is read / write control input pin connecting to the
MCU interface.
When 6800 interface mode is selected, this pin will be used
as Read/Write (R/W#) selection input. Read mode will be
carried out when this pin is pulled HIGH and write mode
when LOW.
When 8080 interface mode is selected, this pin will be the
Write (WR#) input. Data write operation is initiated when this
pin is pulled LOW and the chip is selected.
When serial or I2C interface is selected, this pin must be
connected to VSS.
17 E(RD#) I This pin is MCU interface input.
When 6800 interface mode is selected, this pin will be used
as the Enable (E) signal.
Read/write operation is initiated when this pin is pulled HIGH
and the chip is selected.
When 8080 interface mode is selected, this pin receives the
Read (RD#) signal. Read operation is initiated when this pin
is pulled LOW and the chip is selected.
When serial or I2C interface is selected, this pin must be
connected to VSS.
18 D0 I/O These pins are bi-directional data bus connecting to the
MCU data bus.
Unused pins are recommended to tie LOW.
When serial interface mode is selected, D0 will be the serial
clock input: SCLK; D1 will be the serial data input: SID and
D2 will be the serial data output: SOD.
When I2C mode is selected, D2, D1 should be tied together
and serve as SDAout, SDAin in application and D0 is the
serial clock input, SCL.
19 D1
20 D2
21 D3
22 D4
23 D5
24 D6
25 D7
26 IREF I This pin is the segment output current reference pin.
IREF is supplied externally.
A resistor should be connected between this pin and VSS to
maintain current of around 15uA.
27 ROM0 I These pins are used to select Character ROM; select