Renesas TM V.3.20A Spezifikationen PDF herunterladen (Seite 581)

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Renesas Technology, Tools FAQs

Last Updated: August 25, 2000

Document Number: 01050938_e

When I use the execution of the specified address as measurement trigger in the interval time measurement function, I need to use

the CPU address-read action for the actual trigger event. At this time, the debugger will detect this action at the CPU address

pre-fetch stage (before the CPU executes this instruction). Will the measurement be taken correctly?

Yes, if an address that comes within 3 bytes after a branch instruction is set as the measurement event, the measurement event may

be incorrectly detected. In the same manner, if an interrupt occurs right after the specified address, an incorrect measurement event

may be detected. Two main examples are provided below for reference.

Example 1)

As shown in the description below, the start address of funcB may be pre-fetched when an instruction is executed near the last

address of the adjacent funcA. If the funcB execution time is set for the conditions of the interval time measurement, the

measurement of funcB interval time may start with the funcA pre-fetch.

void funcA()

{

}

void funcB()

{

}

Example 2)

As shown in the description below, when the distance between funcD(); and a=0; is 3 bytes or less, the address for a=0; may be

pre-fetched before funcD() is called. When a read for the a=0; address is set as the measurement start event, you may get a double

measurement: the pre-fetch before funcD() is called and the pre-fetch before the actual instruction execution after returning from

funcD().

void funcC()

{

funcD();

: <-- Less than 3 bytes

a=0; <-- Set a read of this address as the measurement event

}

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