SH7606 Datasheet, PDF (355/532 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family / SH7606 Series

Section 13 Host Interface (HIF)
13.9 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 13.12 shows an image of high-impedance control of the HIF pins. Table 13.6 lists the
input/output control for the HIF pins.
HIFD15 to HIFD00
HIFCS
HIFRS
HIFWR
HIFRD
HIFMD
HIFINT
HIFDREQ
HIFRDY
HIFEBL
Figure 13.12 Image of High-Impedance Control of HIF Pins by HIFEBL Pin
Rev. 4.00 Sep. 13, 2007 Page 329 of 502
REJ09B0239-0400