HD66725 datasheet(9/95 Pages) HITACHI

Part #	HD66725

Description	112 x 80-dot Graphics LCD Controller/Driver

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Manufacturer	HITACHI [Hitachi Semiconductor]

Direct Link	http://www.renesas.com/eng

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HD66740

9

Pin Functions

Table 2

Pin Functional Description

Signals

Number of

Pins

I/O

Connected to

Functions

IM2, IM1

2

I

GND or V

CC

Selects the MPU interface mode:

IM2

"GND"

"Vcc"

IM1

"GND"

"Vcc"

"GND"

"Vcc"

MPU interface mode

Clock synchronized serial interface

68-system parallel interface

I2C bus interface

80-system parallel interface

IM0/ID

1

I

GND or V

CC

Selects the transfer bus length for a parallel bus

interface.

GND: 8-bit bus, Vcc: 4-bit bus

Inputs the ID of the device ID code for a serial bus and

I2C bus interface.

CS*

1

I

MPU

Selects the HD66740:

Low: HD66740 is selected and can be accessed

High: HD66740 is not selected and cannot be

accessed

Must be fixed at GND level when not in use.

RS

1

I

MPU

Selects the register for a parallel bus interface.

Low: Instruction

High: RAM access

Must be fixed at GND level when not in use.

E/WR*/SCL

1

I

MPU

For an 80-system parallel bus interface, serves as a

write strobe signal and writes data at the low level.

For a 68-system parallel bus interface, serves as an

enable signal to activate data read/write operation.

Inputs the serial transfer clock for a serial interface.

Fetches data at the rising edge of a clock.

RW/RD*/

SDA

1I or

I/O

MPU

For an 80-system parallel bus interface, serves as a

write strobe signal and reads data at the low level.

For a 68-system parallel bus interface, serves as a

signal to select data read/write operation.

Low: Write

High: Read

Serves as the bidirectional serial transfer data for a

serial interface.

Sends/Receives data.

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