ST7578
Pin Name
Type
Description
No. of Pins
Read/Write execution control pin. When PS[1:0]=(H,L),
PS2 MPU Type RWR
Description
Read/Write control input pin.
R/W=“H”: read.
6800
H
L
R/W
/WR
series
RWR
I
R/W=“L”: write.
1
Write enable input pin.
Signals on D[7:0] will be latched at the rising
edge of /WR signal.
8080
series
RWR is not used in serial interfaces and should fix to “H” by VDD1.
Read/Write execution control pin. When PS[1:0]=(H,L),
PS2 MPU Type
ERD
Description
Read/Write control input pin.
R/W=”H“: When E is “H”, D[7:0] are in an
output status.
6800
H
E
ERD
I
series
1
R/W=”L“: Signals on D[7:0] are latched at the
falling edge of E signal.
8080
Read enable input pin.
L
/RD
series
When /RD is “L”, D[7:0] are in output status.
ERD is not used in serial interfaces and should fix to “H” by VDD1.
When using 8-bit parallel interface: 6800 or 8080 mode
8-bit bi-directional data bus. Connect to the data bus of 8-bit microprocessor.
When CSB is non-active (CSB=“H”), D[7:0] pins are high impedance.
When using serial interface: 4-LINE or 3-LINE
I/O
D[7:0]
8
D[7:4] : Not used and should fix to “H” by VDD1.
I
D[3:1]=SDA : Serial data input, must be connected together.
D0=SCLK : Serial clock input.
When CSB is non-active (CSB=“H”), D[7:0] pins are high impedance.
Note:
1. After VDD1 is turned ON, any MPU interface pins cannot be left floating.
Clock System Input
Pin Name
Type
Description
No. of Pins
OSC=“H” : On-chip oscillator is used. Connect to VDD1 to set OSC=“H”.
OSC=External clock : Use external clock. Connect external clock to this pin.
OSC=“L” : Stop system clock. The whole circuit is stopped except the logical
and DDRAM circuits.
OSC
I
1
It is not recommended to stop the system clock. When system clock is stopped,
the driver outputs (SEGx & COMx) will be hold at the last state (like DC output)
and the liquid crystal maybe polarized. To avoid this, never stop system clock
before entering Power Down Mode.
Ver 1.2
15/52
2007/04/30
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
