This document is the M68040 User’s Manual revised in 1990, 1992, and 1993, which describes the features and characteristics of the products including MC68040, MC68040V, MC68LC040, MC68EC040, and MC68EC040V.
This manual describes the capabilities, operation, and programming model of the M68040 32‑bit microprocessor and its variants (MC68040V, MC68LC040, MC68EC040, MC68EC040V). It includes sections on the integer unit, memory management unit, caches, signal definitions, JTAG test access port, bus operation, exception handling, and the floating‑point unit.
Additional appendices give electrical and thermal characteristics, ordering information, and special notes for each device variant. The document is intended for engineers designing hardware or software that incorporates the M68040 series.
| Maximum Ratings | see section C.7.1 |
|---|---|
| Thermal Characteristics | see section C.7.2 |
| DC Electrical Specifications | see section C.7.3 |
| Power Dissipation | see section C.7.4 |
| JTAG TCK Frequency | 10 MHz |
The JTAG TCK can operate up to 10 MHz.
The supply voltage VCC must not be exceeded during ramp‑up.