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Section 13 Dot Matrix LCD Controller
13.1
Overview
The LCD controller has built-in display RAM, and performs dot matrix LCD display. One bit of
display RAM data corresponds to illumination or non-illumination of one dot on the LCD panel,
making possible displays with an extremely high degree of freedom.
The LCD controller incorporates all the functions required for LCD display, allowing a dot matrix
display of up to 40 × 32 dots.
I/O ports are used for the interface with the CPU, offering excellent software heritability when
using a combination of MPU and LCD driver.
This module operates on the subclock, making it ideal for use in small portable devices.
13.1.1
Features
• Built-in bit-mapped display RAM (2084 bits)
Maximum of 1280 display bits (selectable from 40 × 32 bits, 56 × 16 bits, 64 × 8 bits, 40 × 16
bits, or 40 × 8 bits)
• Choice of 1/8, 1/16, or 1/32 duty
• Low power consumption enabling extended drive on battery power
Subclock operation
Module standby
• Built-in 2X or 3X LCD power supply step-up circuit
• Comprehensive display control functions
Display data read/write, display on/off control, vertical display scrolling, arbitrary area
blinking, read-modify-write
• CPU interface
I/O port interface
• Built-in contrast control circuit
• Built-in LCD power supply bleeder resistances and voltage follower type op-amp circuits
13. Dot Matrix LCD Controller (H8/3857 Group)
(H8/3857 Group)
Rev.3.00 Jul. 19, 2007 page 327 of 532
REJ09B0397-0300
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