hd66520t Renesas Electronics Corporation., hd66520t Datasheet

hd66520t

Manufacturer Part Number

hd66520t

Description

160-channel 4-level Grayscale Display Column Driver With Internal Bit-map Ram - Hitachi Semiconductor

Manufacturer

Renesas Electronics Corporation.

Datasheet

1.HD66520T.pdf (45 pages)

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Description

The HD66520 is a column driver for liquid crystal dot-matrix graphic

incorporates 160 liquid crystal drive circuits and a 160

LCDs in portable information devices. It also includes a general-purpose SRAM interface so that draw

access can be easily implemented from a general-purpose CPU. The HD66520 also has a new arbitration

method which prevents flicker when the CPU performs draw access asynchronously. The on-chip display

RAM greatly decreases power consumption compared to previous liquid crystal display systems because

there is no need for high-speed data transfer. The chip also incorporates a four-level grayscale controller

for enhanced graphics capabilities, such as icons on a screen.

Features

1014

(160-Channel 4-Level Grayscale Display Column Driver with

Duty cycle: 1/64 to 1/240

Liquid crystal drive circuits: 160

Low-voltage logic circuit: 3.0 to 5.5-V operation power supply voltage

High-voltage liquid crystal drive circuit: 8 to 28-V liquid crystal drive voltage

Grayscale display: FRC four-level grayscale display

Grayscale memory management: Packed pixel

Internal bit-map display RAM: 76800 bits (160 240 lines

CPU interface

SRAM interface

Address bus: 16 bits, data bus: 8 bits

Internal Bit-Map RAM)

HD66520T

240

2-bit bit-map RAM, which is suitable for

two planes)

display systems. This LSI

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