Overview Of Lcd Controller - Fujitsu F2MC-8FX Hardware Manual

CHAPTER 24 LCD CONTROLLER
24.1

Overview of LCD Controller

The LCD controller contains 14 bytes of display data memory and controls LCD display
via 4 common outputs and 28 segment outputs. It offers a choice of three different duty
outputs to directly drive the LCD panel (liquid crystal display device).
Functions of LCD Controller
The LCD controller uses its segment and common outputs to display the contents of display data
memory (display RAM) directly on the LCD panel (liquid crystal display device).
• LCD drive voltage divider resistor integrated. Also capable of connecting an external divider
resistor.
• Up to 4 common outputs (COM0 to COM3) and 28 segment outputs (SEG0 to SEG23, SEG28
to SEG31) available (The number of segment outputs depends on each series.)
• 14 bytes (28 x 4 bits) of display RAM integrated. (The display RAM size depends on each
series)
• Main clock or subclock selectable(only in product with dual clock system) as the operating
clock.
• Blinking function (limited to some pins & product with dual clock system).
• Capable of directly driving the LCD panel.
• Duty selectable from among 1/2, 1/3, and 1/4 (restricted by the bias setting).
Table 24.1-1 lists the bias-duty combinations available
Table 24.1-1 Bias-duty Combinations.
1/2 bias
1/3 bias
: Recommended mode
m
: Prohibited
×
Note:
The 1/2 bias seting is for use with external divider resistors.
Blinking function can only be operated in product with dual clock system. in the product with single
clock system, this function is disabled, the LCDCB1/2 has no effect
subclock selectable only available in product with dual clock system
432
Bias 1/2 Duty
×
1/3 Duty 1/4 Duty
× ×