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7477 Datasheet(PDF) 177 Page - Renesas Technology Corp |
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7477 Datasheet(HTML) 177 Page - Renesas Technology Corp |
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177 / 354 page  7470/7471/7477/7478 GROUP USER’S MANUAL 1-160 HARDWARE 1.17 Low-power dissipation function 1.17 Low-power dissipation function The 7470/7471/7477/7478 group is provided with a function to put the CPU into a wait state with low-power dissipation by stopping the CPU operation by softoware. The low-power dissipation function has the following 2 modes. q Stop mode by a STP instruction q Wait mode by a WIT instruction Figure 1.17.1 shows the operation states of the microcomputer at low-power dissipation and Figure 1.17.2 shows a state transition. Fig. 1.17.1 Operation states of the microcomputer at low-power dissipation CPU Timer A-D converter Serial I/O External interrupt Peripheral device Stop Stop Operating Stop Operating Operating STP mode Oscillation stops WIT mode Oscillation is operating Note : When using an external clock, timer and serial I/O are operating. |
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