MC68HC812A4 Datasheet, PDF (141/342 Pages) Motorola, Inc – 16-bit device composed of standard on-chip peripheral modules connected by an intermodule bus. Modules include

Memory Expansion and Chip-Select
Priority
Only one chip-select is active at any address. In the event that two or
more chip-selects cover the same address, only the highest priority
chip-select is active.
Chip-selects have this order of priority:
Highest
Lowest
CS3
CS2
CS1
CS0 CSP0 CSD CSP1
Advance Information
MOTOROLA
Memory Expansion and Chip-Select
MC68HC812A4 — Rev. 3.0
141