Renesas TM V.3.20A Specifikace stáhnout pdf (Strana 652)

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Renesas Technology, Tools FAQs

Last Updated: November 19, 1999

Document Number: 01050897_e

When I reference the coverage measurement result in my PD38, it seems to be showing instructions which the MCU never

executed. This happens at the instruction after the RTS instruction. This instruction at this address is never executed in the target

program. Why does this happen?

The cause of this problem is in the 740 family specification. Principally, the coverage measurement is a record of the MCU address

bus activity during the target program operation. Usually, the value on the address bus is the next instruction location to be

executed. However, when the RTS instruction is executed, for example, the RTS instruction is a one- byte instruction. During the

RTS instruction execution, the address bus shows the next instruction location right after the RTS instruction. Therefore, this

address bus behavior confuses the coverage measurement function by causing it record unnecessary address data.

This kind of address bus behavior happens in the following instructions:

all one-byte size instructions

●

jump instruction (only BRA instruction)●

branch instructions (BCC/BNE, etc. If no branch occurs, this problem does not occur.)●

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