ST7070
Pin Function
Name
RS
Number
1
I/O
I
Interfaced
with
MPU
Function
Select registers.
0: Write Instruction or “Read Busy Flag and Address”
1: Data write/read
It is not used in 3-Line SPI interface, fix RS at low, not floating.
Select read or write.
0: Write 1: Read
When serial interface select ,R/W pull low, not floating.
Starts data read/write.
When serial interface select ,E pull height , not floating.
Hardware reset pin, Low active
Parallel /Serial selection. PSB: ”1” Parallel , “0” Serial.
Four high order bi-directional tristate data bus pins. Used for
data transfer and receive between the MPU and the ST7070.
DB7 can be used as a busy flag.
Serial:
DB7:data input pin for serial mode(SI)
DB6:serial clock input for serial mode(SCL)
DB5:chip select pin for serial mode(/CS)
When serial interface select ,D4 pull height , not floating.
4bits mode : These pins are used during 4-bit operation.
Four low order bi-directional tristate data bus
pins. Used for data transfer and receive
between the MPU and the ST7070.
These pins are not used during 4-bit operation and serial
interface , must pull height , not floating.
Clock to latch serial data D sent to the
Extension driver
Clock to shift serial data D
Switch signal for converting the liquid crystal
drive waveform to AC
Character pattern data corresponding to each
segment signal
Common signals that are not used are changed
to non-selection waveform. COM9 to COM16
are non-selection waveforms at 1/8 duty factor
and COM12 to COM16 are non-selection
waveforms at 1/11 duty factor.
Segment signals
Power supply for LCD drive
V0
－
Vss = 10 V (Max)
V
CC
: 2.7V to 5.5V, GND: 0V
When crystal oscillation is performed, a resistor
must be connected externally. When the pin
input is an external clock, it must be input to OSC1.
R/W
E
XRESET
PSB
1
1
1
1
I
I
I
I
MPU
MPU
MPU
MPU
DB4 to DB7
4
I/O
MPU
DB0 to DB3
4
I/O
MPU
CL1
CL2
M
D
1
1
1
1
O
O
O
O
Extension driver
Extension driver
Extension driver
Extension driver
COM1 to
COM16
SEG1 to
SEG80
V0 to V4
V
CC
, GND
OSC1, OSC2
16
O
LCD
80
5
2
2
O
-
-
LCD
Power supply
Power supply
Oscillation
resistor clock
Note:
1. V0 >= V1 >= V2 >= V3 >= V4 >= Vss must be maintained
2. Two clock options:
R=91K (Vcc=5V)
R=75K (Vcc=3V)
OSC1
R
OSC2
Clock input
OSC1
OSC2
V1.4
7/51
2009/04/29
SITRONIX [ SITRONIX TECHNOLOGY CO., LTD. ]
