SH7618 Datasheet, PDF (501/646 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series

Section 17 I/O Ports
17.6 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.
2. Since the HIFMD pin is not initially set to function as a general port pin, it must be pulled up
or down externally to fix its state.
3. When using a multiplexed pin with a function not selected with its initial value (for example,
using the PB12/CS3 pin, the initial function of which is PB12, as the CS3 pin), the pin must be
pulled up or down externally at least after a reset until its pin function is selected by software
to fix its state.
Rev. 6.00 Jun. 12, 2007 Page 469 of 610
REJ09B0131-0600