H8S Family
LCD Display Using 1/4 Duty Drive (LCD Controller/Driver)
REJ06B0486-0100/Rev.1.00
March 2005
Page 3 of 19
2. Functions
Used
(1) Features of LCD Controller/Driver
In this sample task information is displayed on an LCD module using the H8S/2268 internal LCD controller/driver.
The features of the LCD controller/driver are listed below.
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Display Capacity
(a) Duty cycle: static (internal driver: 40 SEG)
(b) Duty cycle: 1/2 (internal driver: 40 SEG)
(c) Duty cycle: 1/3 (internal driver: 40 SEG)
(d) Duty cycle: 1/4 (internal driver: 40 SEG)
•
LCD RAM capacity: 8 bits × 20 bytes (160 bits)
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Byte or word access to LCD RAM is supported.
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The segment output pins can be used as ports in groups of eight.
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In the static mode and with 1/2 duty, common output pins not used because of the duty cycle can be used for
common double-buffering (parallel connection).
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A choice of 11 frame frequencies is supported.
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A or B waveform is selectable by software.
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Built-in power supply split-resistors and LCD drive power supply.
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Display is possible in operating modes other than the standby mode and the module stop mode.
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Display is possible during low-voltage operation using built-in triple step-up voltage circuit.
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Module stop mode halts LCD operation when not in use.
