INITIALIZATING MICRO-COMPUTER PERIPHERALS
Original Publication Date: 1985-Oct-01
Included in the Prior Art Database: 2001-Oct-17
The normal technique of initialisating peripheral circuits attached to a microprocessor bus by means of writing to internal registers is not sufficient for some situations. The MC66HC25, a peripheral designed to replace 2 ports on several different microcomputers operating in expanded mode, is a case in point. Since it also provides chip select signals to the memories in minimum chip count systems the part has to know in advance of the reset signal being disasserted the memory map required both for its own internal registers and that of the memories it is con- trolling.