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31 Cards in this Set
- Front
- Back
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Each chip only has ___ data lines
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8
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What bit lets you step through your program
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Trace Bit
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RTS used in what mode
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User Mode
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Priveleged instructions can only occur in
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Supervisory State
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To return from an exception handler you must use what?
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RTE
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All exception processing is performed in What state?
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Supervisor
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A typical exception pushes the current program counter and ....
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flags
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Vector addresses are equal to
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4 times the vector number, then convert to HEX
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The first vector is reserved for
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the initial supervisor stck pointer and program counter
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No instruction begins with an ...
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A(1010) or F(1111)
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When not requesting a hardware interrupt, the IPL inputs must all be
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high
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What happens when things are put in the stack
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The stack decrements
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What happens when things are taken out of the stack
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The stack increments
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The 68000 is always functioning in one of which 3 states?
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Normal, Halted, Exception
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THe 68000 is executing instructions that may be part of a user program in what state?
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Normal processing state
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The processor is not executing any instructions in what state?
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Halted
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This state is loosely though of as an interrupt
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Exception State
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The state of all internal flags, together with the contents of all CPU register, including the program counter is called the
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Context of the processor
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Name two privilege states
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user and supervisor
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Which bit is used to determine the type of privilege
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S bit
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If the S bit is 0, the processor executes instructions in which state
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User
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If the Reset exception occurs at a time when any kind of processing is taking place...
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that process is terminated and never resumed
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The external system hardware must pull RESET and HALT to ground for at least
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100ms to initiate a reset exception
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What happens when the processor tries to fetch data longer than 1 byte in length from an odd memory location
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Address Error
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The nonmaskable interrupt is which level
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Level 7
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What is any code read from memory,during an instruction feth, that does not match the bit patterns of any of the predefined opcodes in the 68000's instruction set
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An illegal instruction
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When a vector is needed but the vector number is not supplied the processor will create an
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Autovector
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What gives the user a chance to enhance the instruction set of the 68000, by adding custom instructions at a later time
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Unimplemented Instructions (All begin with A or F)
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How many TRAPS are there?
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16
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What is the difference between TRAP and TRAPV
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TRAPV does not require an operand field and will generate exception only if (V) flag is set
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Which instruction is used to check the value in a data register to see if it is within a certain range
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CHK (Only lower word of data register is checked)
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