SH7606 Datasheet, PDF (401/532 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family / SH7606 Series

Section 15 I/O Ports
15.6 Usage Note
1. When pins multiplexed with general I/O is used as output pins for other functions, these pins
work as general output pins for the period of 1 × t_PCYC synchronized with internal power-on
reset by WDT overflow. For example, when the pin PB12/CS3 works as CS3 and the PB12DR
bit in PBDRL is set to 0, the pin is driven low for the period of 1 × t_PCYC and may cause
memory malfunction. To prevent this, port registers that correspond to pins used for the strobe
output must be set to strobe non-active level. This does not apply to the power-on reset from
the RES pin.
Rev. 4.00 Sep. 13, 2007 Page 375 of 502
REJ09B0239-0400