HD6417618A datasheet(451/646 Pages) RENESAS

Teilenummer	HD6417618A

Bauteilbeschribung	32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series

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Hersteller	RENESAS [Renesas Technology Corp]

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Section 15 Host Interface (HIF)

Rev. 6.00 Jun. 12, 2007 Page 419 of 610

REJ09B0131-0600

15.9

Interface When External Device Power is Cut Off

When the power supply of an external device interfacing with the HIF is cut off, intermediate

levels may be applied to the HIF input pins or the HIF output pins may drive an external device

not powered, thus causing the device to be damaged. The HIFEBL pin is provided to prevent this

from happening. The system power monitor block controls the HIFEBL pin in synchronization

with the cutoff of the external device power so that all HIF pins can be set to the high-impedance

state. Figure 15.12 shows an image of high-impedance control of the HIF pins. Tables 15.6 and

15.7 list the input/output control for the HIF pins.

HIFCS

HIFWR

HIFRD

HIFD15 to HIFD00

HIFRS

HIFMD

HIFINT

HIFDREQ

HIFRDY

HIFEBL

Figure 15.12 Image of High-Impedance Control of HIF Pins by HIFEBL Pin

HD6417618A Datenblatt(PDF) 451 Page - Renesas Technology Corp