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Renesas Electronics America - Knowledgebase

Can SH7705 TRST pin be pulled down at 1k-ohm in normal operation?

Latest Updated:03/25/2009


Can SH7705 TRST pin (142-pin) be pulled down at 1k-ohm? (In normal operation)


TRST pin can be pulled down.  We recommend 1k-ohm as resistance.

Since the internal pull-up MOS is turned ON, small amount of current flows when TRST pin is pulled down externally.

It results in no damage to chip reliability.

A following process can stop this small amount of current.

The normal operation starts after the power-on reset.
Then, PTG3 of the Pin Function Controller can be set Port input (pull-up MOS: Off) with PG3MD1=1,PG3MD0=1.

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