HD66781 Datasheet, PDF(98/196 Page) Renesas Technology Corp – 720-channel Source Driver for a-Si TFT/Low Temperature Poly-Si TFT Panels with 262,144-color display RAM

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HD66781 Datasheet, PDF (98/196 Pages) Renesas Technology Corp – 720-channel Source Driver for a-Si TFT/Low Temperature Poly-Si TFT Panels with 262,144-color display RAM

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HD66781

Preliminary

Reset Function

The HD66781 is internally initialized by RESET input. During the reset period, internal settings are

initialized. No access to instructions or GRAM data from the MPU is accepted during the reset period.

The gate driver and the power supply are also automatically initialized when RESET input enters into the

HD66781. The RESET period must be secured for at least 1 ms. In case of resetting by turning on the

power supply (power-on reset), wait until the R-C oscillation frequency becomes stable after power is

supplied (10 ms). During this period, do not access GRAM or make any initial instruction setting.

Instruction Set Initialization

See the parenthetic number in each bit in the instruction list for the initial value.

RAM Data Initialization

The RAM data are not automatically initialized by RESET input and must be initialized by software during

the display-off period (D1â0 = 00).

Output Pin Initialization

1. LCD driver output pins (source outputs)

2. Vcom

3. Gate driver control signal

4. Gate driver serial interface

5. Oscillator output pin

6. Synchronizing signal (BST)

7. RESET signal output

: Output GND level (All pins)

: Halt (Output GND)

(FLM1, FLM2, CL11/SFTCLK11,

CL12/SFTCLK12, SFTCLK21, SFTCLK22,

M1, M2, DISPTMG1, DISPTMG2, EQ1, EQ2,

DCCLK1, DCCLK2)

: Halt GCS, GCL, GDA (Vcc1 output)

: Oscillate

: Output GND

: Same polarity with the RESET* input

Rev.0.5, July.31.2003, page 98 of 196

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