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HD6417618 Datasheet(PDF) 501 Page - Renesas Technology Corp |
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HD6417618 Datasheet(HTML) 501 Page - Renesas Technology Corp |
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501 / 646 page  Section 17 I/O Ports Rev. 6.00 Jun. 12, 2007 Page 469 of 610 REJ09B0131-0600 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. |
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