Section 18 Lcd Controller/Driver; Overview; Features - Hitachi H8S/2646 Hardware Manual

18.1

Overview

The H8S/2646 Series has an on-chip segment type LCD control circuit, LCD driver, and power
supply circuit, enabling it to directly drive an LCD panel.
18.1.1

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 × 20 bytes (160 bits)
 Byte or word access to LCD RAM
• The segment output pins can be used as ports in groups of four.
• Common output pins not used because of the duty cycle can be used for common double-
buffering (parallel connection).
 With 1/2 duty, parallel connection of COM1 to COM2, and of COM3 to COM4, can be
used
 In static mode, parallel connection of COM1 to COM2, COM3, and COM4 can be used
• Choice of 11 frame frequencies
• A or B waveform selectable by software
• Built-in power supply split-resistance
• Display possible in operating modes other than standby mode and module stop mode

Section 18 LCD Controller/Driver

H8S/2646, H8S/2646R,
H8S/2645
24 SEG
24 SEG
24 SEG
24 SEG
Internal Driver
H8S/2648, H8S/2648R,
H8S/2647
40 SEG
40 SEG
40 SEG
40 SEG
631