System Overview; Figure 1-1 Block Diagram Of The S1D13700 - Epson S1D13700 User's & Technical Manual

1: OVERVIEW
1.2

System Overview

Positioned midway between the MPU and LCD panel, the S1D13700 enables the sending and
receiving of control commands and data, and access of registers by the MPU for display, thus
making it possible to control up to 32 Kbytes of internal display memory (VRAM).
Moreover, because the S1D13700 has a built-in a control circuit for LCD units, it is possible to
take full advantage of the features of midsize, dot-matrix liquid crystal display units without using
any external circuit.
Video RAM
Character
Generator RAM
Video RAM
Arbitrate
Display Address
Generator
The S1D13700 divides the display memory space into the four areas shown below. When this
configuration is combined with the layered (overlaid) display and flexible scroll functions of the
S1D13700, it is possible to greatly reduce the MPU load when inverting or underlining text,
displaying graphs with text, or creating simple animation.
The S1D13700 uses the display memory space by dividing it into the four areas shown below to
realize the layered display functions using only a single controller.
2
Character
Generator ROM
Layered
Cursor Address
Controller
Controller
Microprocessor Interface

Figure 1-1 Block diagram of the S1D13700

LCD
LCD Controller
Layered
GrayScale
FRM Controller
EPSON
Dot Clock
Generator
Internal Clock
Dot Counter
Oscillator
S1D13700 Technical Manual