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7513 데이터시트(PDF) 24 Page - Renesas Technology Corp |
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7513 데이터시트(HTML) 24 Page - Renesas Technology Corp |
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24 / 66 page ![]() 23 SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER MITSUBISHI MICROCOMPUTERS 7513 Group Key Input Interrupt (Key-on wake-up) A Key-on wake up interrupt request is generated by applying a falling edge to any pin of port P2 that have been set to input mode. In other words, it is generated when AND of input level goes from “1” to “0”. An example of using a key input interrupt is shown in Figure 18, where an interrupt request is generated by pressing one of the keys consisted as an active-low key matrix which inputs to ports P20–P23. Fig. 18 Connection example when using key input interrupt and port P2 block diagram ✽ ✽✽ ✽ ✽✽ ✽ ✽✽ ✽ ✽✽ ✽ ✽✽ ✽ ✽✽ ✽ ✽✽ ✽ ✽✽ Port P20 latch Port P20 direction register = “0” Port P21 latch Port P21 direction register = “0” Port P22 latch Port P22 direction register = “0” Port P23 latch Port P23 direction register = “0” Port P24 latch Port P24 direction register = “1” Port P25 latch Port P25 direction register = “1” Port P26 latch Port P27 latch Port P27 direction register = “1” Port P20 input Port P21 input Port P22 input Port P23 input Port P24 output Port P25 output Port P26 output Port P27 output PULLA register Bit 2 = “1” Port P2 input reading circuit Key input interrupt request Port PXx “L” level output ✽ P-channel transistor for pull-up ✽✽ CMOS output buffer Key input control register = “1” Key input control register = “1” Key input control register = “1” Key input control register = “1” Key input control register = “1” Key input control register = “1” Key input control register = “1” Port P26 direction register = “1” Key input control register = “1” |
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