MITSUBISHI ELECTRIC T-60 - Manual (Page 11)

The 8 line by 40 character LCD display serves as a display port,
programming tool and soft key label. In the edit mode, the display can be
used to scroll through text, make changes, or debug programs. In the run
mode text, soft key titles and graphics can be displayed under program
control.
The bottom of the T-60 incorporates the entire connector system for parallel
and serial I/O.
Figure 1 diagrams the internal components of the T-60. The heart of the unit
is a high speed 64180, 8 bit high integration CPU chip. The CPU
communicates with UARTS (serial ports), ROM, RAM, TIMERS, and I/O.
Battery backed-up RAM stores programs and variables even if the power is
removed. It can hold a program for over 5 years without power applied. The
opto-isolation circuitry is designed to provide a barrier between the outside
world (I/O ports) and the CPU. This eliminates CPU errors in high noise
environments. The serial and parallel ports have their own power supply to
further insure that noise does not disrupt the CPU’s operation.
Figure 1
Block Diagram
Introduction
Functional Description
3