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7549 Datasheet(PDF) 27 Page - Renesas Technology Corp |
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7549 Datasheet(HTML) 27 Page - Renesas Technology Corp |
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27 / 86 page  Rev.2.02 Mar 31, 2009 Page 25 of 81 REJ03B0202-0202 7549 Group Key Input Interrupt (Key-On Wakeup) A key-on wakeup interrupt request is generated by applying “L” level to any pin of port P1 that has been set to input mode. In other words, it is generated when the AND of input level goes from “1” to “0”. An example of using a key input interrupt is shown in Figure 23, where an interrupt request is generated by pressing one of the keys provided as an active-low key matrix which uses ports P10 to P13 as input ports. Fig 23. Connection example when using key input interrupt and port P1 block diagram Port PXx level output Port P1 pull-up control register bit 7 = Port P17 latch Port P17 Direction register = ** * P17 output Key input interrupt request * P-channel transistor for pull-up ** CMOS output buffer Port P1 pull-up control register bit 6 = Port P16 latch Port P16 Direction register = ** * P16 output bit 5 = Port P15 latch Port P15 Direction register = ** * P15 output bit 4 = Port P14 latch Port P14 Direction register = ** * P14 output bit 3 = Port P13 latch Port P13 Direction register = ** * P13 input bit 2 = Port P12 latch Port P12 Direction register = ** * P12 input bit 1 = Port P11 latch Port P11 Direction register = ** * P11 input bit 0 = Port P10 latch Port P10 Direction register = ** * P10 input Falling edge detection Falling edge detection Falling edge detection Falling edge detection Falling edge detection Falling edge detection Falling edge detection Falling edge detection Port P10 key-on wakeup selection bit Port P16 key-on wakeup selection bit “L” “0” “0” “0” “0” “1” “1” “1” “1” “1” “1” “1” “1” “0” “0” “0” “0” Port P1 Input read circuit Port P17 key-on wakeup selection bit Port P1 pull-up control register Port P1 pull-up control register Port P1 pull-up control register Port P1 pull-up control register Port P1 pull-up control register Port P14 key-on wakeup selection bit Port P13 key-on wakeup selection bit Port P12 key-on wakeup selection bit Port P1 pull-up control register Port P11 key-on wakeup selection bit Port P15 key-on wakeup selection bit |
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