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7733 bảng dữ liệu(PDF) 883 Page - Renesas Technology Corp |
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7733 bảng dữ liệu(HTML) 883 Page - Renesas Technology Corp |
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883 / 940 page ![]() 17–3 APPLICATIONS 7736 Group User’s Manual 17.4 Power saving 17.4 Power saving Power saving examples (in other words, examples to save power consumption) with the stop or wait mode used in external bus mode A are described below. The following examples differ from examples in external bus mode B only in external bus pins allocated to ports P0 to P3. Therefore, for power saving in external bus mode B, refer to this section. 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 P100 to P103 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 P100 to P103 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. |
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