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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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7733 데이터시트(PDF) 451 Page - Renesas Technology Corp |
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7733 데이터시트(HTML) 451 Page - Renesas Technology Corp |
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451 / 940 page  APPLICATIONS 7733 Group User’s Manual 17–44 17.4 Power saving Power saving examples (in other words, examples to save power consumption) with the stop or wait mode used are described below. 17.4.1 Power saving example with stop mode used In this example, power saving is realized by using the stop mode. The stop mode is terminated by using the key input interrupt function. (1) Specifications The microcomputer operates in the single-chip mode. Pins P50 to P53 are used as output pins for the key matrix scanning. Input pins (KI0 to KI3) for the key input interrupt function are used as key input pins. Pins KI0 to KI3 are pulled high by using the pull-up function. The initial output levels of pins P50 to P53 are “L.” When a key input interrupt request occurs owing to a key push, the key data is read-in. (This reading is surely performed independent of power saving.) In the stop mode, interrupts other than a key input interrupt are disabled. An external clock is used as the main clock. 17.4 Power saving |
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