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Chapter 47 LCD Controller
1.Overview
Chapter 47 LCD Controller
1. Overview
LCD allows display of up to 160 cells and selection of a duty cycle from 1/2, 1/3 and 1/4.
LCD has many applications.
2. Features
• Quantity: 1 (4 common x 40 segment)
• Display: Up to 160 cells (for 1/4 duty cycle)
• Duty cycle: Selectable from options: 1/2, 1/3 and 1/4.
• Bias: Fixed at 1/3
• Frame period: Selectable from four options. (For clock, peripheral clock or subclock is selectable.)
• Driver: Built-in (for internal divided resistors), or external divided resistors can be connected to the V0 - V3
pins.
• Data memory: Built-in 20-byte data memory for display
• Stop mode: Enable LCD display in the sub-stop mode.
• Blank display: Selectable.
• Pin: The SEG0-39 of COM0-4 pin usage can be switched between general and specialized purposes.
• Other: External divided resistors can be also used to shut off the current when LCD is deactivated.
VRAM19
VRAM1
VRAM2
bit 0
Internal Divided Resistors
or
External Divided Resistors
Timing Circuit
Prescaler
Peripheral
clock
Sub-clock
AC Circuit
Common
Segment
Driver Driver
bit 7
bit 6 bit 5
bit 4
bit 3 bit 2
bit 1