1989_MELPS_7700_Software_Manual

Introduction of Series MELPS 7700 Software
1. Introduction of Series MELPS 7700 Software
The software for the Series MELPS 7700 16-bit CMOS microcomputers was developed by
making is numerous enhancements on the software for the Series MELPS 740 8-bit microcomputer
which are based on Mitsubishi Electric Corporation's proprietary designs. The enhancements
include support of word (16-bit) operations and linear accessing of up to 16M bytes of
memory space.
The new software's compact and easy to use instruction set and the support of powerful addressing
modes will significantly increase
:The Series MELPS 7700 microcomputers offer the following features
• Upward compatibility for the Series MELPS 740.
• Powerful addressing modes and fast and compact instruction set.
• Direct page mapping function and memory oriented software system by direct paging.
• Byte and word operations can be selected at will by the m flag.
• The usual 64K bytes program memory boundary can be ignored for the practical
purposes, and programs can be written to utilize the full 16M bytes of memory space. For
data memory, linear as well as bank memory acceSSing are supported.
• Bit manipulation instructions and bit test and branch instructions can be used for memory
and I/O accessing of the entire 16M bytes space.
• Block transfer instruction capable of handling blocks of up to 64K bytes each.
• Improved stack accessing capability.
• Decimal arithmetic instruction execution requiring no software compensation.
The performance of the systems based on the Series MELPS 7700 microcomputers, whether
used as advanced 8-bit microcomputer or next-generation 16-bit one.