HP 1652B Getting Started Manual page 264

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The steps of the 68000 reset vector fetch are:

HP 16528/1653B

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1. Set the stack pointer to a location you specify, which is in ROM at

address locations 0 and 2.

Find the fast address location in memory where the

microprocessor fetches its first instruction. This is also specified

by you and stored in ROM at address locations

What you decide to find out is:

1. What ROM address does the microprocessor look at for the

location of the stack pointer, and what is the stack pointer

location stored in ROM?

What ROM address does the microprocessor look at for the

address where its first instruction is stored in ROM, and is the

instruction correct?

3. Does the microprocessor then go to the address where its frost

instruction is stored?

4. Is the executable instruction stored in the first instruction location

Your measurement, then, requires verification of the sequential

addresses the microprocessor looks at, and of the data in ROM at

these addresses. If the reset vector fetchis correct (in this example)

you will see the following list of numbers in HEX (default base) when

your measurement results are displayed.

+oooooooooooooo

+ 0001 OOOOO204FC

+ooo2ooooO4oooo

+ 0003OOOOO68048

+ 00040080483E7C

This list of numbers will be explained in detail later in this chapter in

"The State Listing."

State Analyzer Measurement Example

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