Lcd-Iii (Hd44790, Hd44795) - Hitachi AP1 Data Book

LCD- IIHHD44790,HD44795)-
The LCD-III is the CMOS 4-bit single chip microcomputer
which contains ROM, RAM, I/O, Timer/Event Counter and
Control Circuit, Direct Drive Circuit for LCD on single chip.
The LCD-III is designed to drive LCD directly and perform
efficient controller function as well as arithmetic function for
both binary and BCD data. With the on-chip crystal oscillator
for timer, the clock function is easily realized. The CMOS
technology of the LCD-III provides the flexibility of microcom-
puters for battery powered and battery back-up applications in
combination with low power consuming LCD.
• FEATURES
• 4-bit Architecture
• 2,048 Words of Program ROM (10 bitslWord)
128 Words of Pattern ROM (10 bitslWord)
• 160 Digits of Data RAM and Display Data RAM (4 bits/
Digit)
• Control Circuit and Direct Drive Circuit for LCD
4 Commons (Duty Radio; Static, 1/2, 1/3, 1/4)
32 Segments (Externally expandable up to 96 Segments
using external Drivers HD44100s)
• 32 I/O Lines and 2 External Interrupt Lines
• Timer/Event Counter
• All Instructions except One Instruction; Single Word and
Single Cycle
• BCD Arithmetic Instructions
• Pattern Generation Instruction
- Table Look Up Capability -
• Powerful Interrupt Function
3 Interrupt Sources
~ 2 External Interrupt Lines
L
Timer/Event Counter
Multiple Interrupt Capability
• Bit Manipulation Instructions for Both RAM and I/O
• Option of I/O Configuration Selectable on Each Pin; Pull
Up MOS or CMOS or Open Drain
• Built-in Oscillator for System Clock (Resistor or Ceramic
Filter)
• Built-in Crystal Oscillator for Timer
• Built-in Power-on Reset Circuit
• Low Operating Power Dissipation; 2mW typo
• Stand-by Mode (Halt Mode); 50IlW max.
• 2 Versions; HD44790 VCC
=
5V
±
10%, 10llS Instruction
Cycle Time
HD44795 VCC
=
2.7V to 5.5V, 20lls Instruc·
tion Cycle Time
LCD·1I1
(FP·80)
• PIN ARRANGEMENT
137
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•
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=
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LCD-III
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6
.5
(Top View)
2 SEG,
1 SEG,
COM.
• COM,
• COM,
1
COM,
• V,
I V,