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102 / 400 page  &3, ,QWHUUXSW DQG 7UDS )XQFWLRQV User’s Manual 5-20 1999-08 A few examples illustrate these delays: • The worst case interrupt response time including external accesses will occur, when instructions N, N+1 and N+2 are executed out of external memory, instructions N-1 and N require external operand read accesses, instructions N-3 through N write back external operands, and the interrupt vector also points to an external location. In this case the interrupt response time is the time to perform 9 word bus accesses, because instruction I1 cannot be fetched via the external bus until all write, fetch and read requests of preceding instructions in the pipeline are terminated. • When the above example has the interrupt vector pointing into the internal code memory, the interrupt response time is 7 word bus accesses plus 2 states, because fetching of instruction I1 from internal code memory can start earlier. • When instructions N, N+1 and N+2 are executed out of external memory and the interrupt vector also points to an external location, but all operands for instructions N- 3 through N are in internal memory, then the interrupt response time is the time to perform 3 word bus accesses. • When the above example has the interrupt vector pointing into the internal code memory, the interrupt response time is 1 word bus access plus 4 states. After an interrupt service routine has been terminated by executing the RETI instruction, and if further interrupts are pending, the next interrupt service routine will not be entered until at least two instruction cycles have been executed of the program that was interrupted. In most cases two instructions will be executed during this time. Only one instruction will typically be executed, if the first instruction following the RETI instruction is a branch instruction (without cache hit), or if it reads an operand from internal code memory, or if it is executed out of the internal RAM. Note: A bus access in this context includes all delays which can occur during an external bus cycle. |
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