Displaytech Ltd

LCD MODULE

INT024BTFT / INT024BTFT-TS

Version: 2.0

7

6. Interface Description

Pin no

Symbol

I/O

Description

1~2

VDD

---

Power supply 3.3V

3~4

VCC

---

Power supply 3.3V

5

GND

---

Power ground 0V

6

/CS

I

Chip Select Input

Low active chip select pin.

7

RS

I

Command / Data Select Input

The pin is used to select command/data cycle. RS = 0, data Read/Write cycle is

selected. RS = 1, status read/command write cycle is selected.

In 8080 interface, usually it connects to “A0” address pin.

8

/RD

I

Enable/Read Enable

When MCU interface (I/F) is 8080 series, this pin is used as data read (RD#),

active low.

When MCU I/F is 6800 series, this pin is used as Enable (EN), active high.

9

/WR

I

Write/Read-Write

When MCU I/F is 8080 series, this pin is used as data write (WR#), active low.

When MCU I/F is 6800 series, this pin is used as data read/write control (RW#).

Active high for read and active low for write.

10

/RST

I

Reset Signal Input

This active-low input performs a hardware reset on the RA8872. 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.

11

~

18

DDB00

~

DDB07

I/O

Data Bus

These are data bus for data transfer.

19

INT

O

Interrupt Signal Output

The interrupt output for MCU to indicate the status of RA8872.

20

WAIT

O

Wait Signal Output

This is a WAIT output to indicate the RA8872 is in busy state. The RA8872 can’t

access MCU cycle when WAIT# pin is active. It is active low and could be used

for MCU to poll busy status by connecting it to I/O port.

21

GND

---

Power ground 0V

22

NC (PWM)

---

No connection

23

NC (VLED+)

---

No connection

24

NC (VLED-)

---

No connection