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13.1 Overview
The H8/3867 Series and H8/3827 Series has an on-chip segment type LCD control circuit, LCD
driver, and power supply circuit, enabling it to directly drive an LCD panel.
13.1.1
Features
1. Features
Features of the LCD controller/driver are given below.
•
Display capacity
Duty Cycle
Static
1/2
1/3
1/4
•
LCD RAM capacity
8 bits × 32 bytes (256 bits)
•
Word access to LCD RAM
•
All eight segment output pins can be used individually as port pins.
•
Common output pins not used because of the duty cycle can be used for common double-
buffering (parallel connection).
•
Display possible in operating modes other than standby mode
•
Choice of 11 frame frequencies
•
Built-in power supply split-resistance, supplying LCD drive power
•
Use of module standby mode enables this module to be placed in standby mode independently
when not used.
•
Built-in step-up constant-voltage (5 V) power supply allows LCD display even at low
voltages. (H8/3867 Series)
•
A or B waveform selectable by software
Section 13 LCD Controller/Driver
Internal Driver
32 seg
32 seg
32 seg
32 seg
Segment External Expansion Driver
256 seg
128 seg
64 seg
64 seg
325
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