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UPD17015 Datasheet(PDF) 77 Page - NEC |
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UPD17015 Datasheet(HTML) 77 Page - NEC |
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77 / 120 page  77 µPD17015 14. STANDBY The standby function is used to reduce the supply current during back-up. 14.1 STANDBY FUNCTIONS Fig. 14-1 outlines the standby block. The standby block reduces the device current drain by stopping some, or all, operations of the device. The standby block has the following three functions. These functions can be used to suit the application. 1 Halt function 2 Clock-stop function 3 Device operation control by CE pin The halt function reduces the device current drain by stopping CPU operation with a “HALT h” instruction. The clock-stop function reduces the device current drain by stopping the oscillation circuit with a “STOP s” instruction. Since the CE pin is used to control operation of the image display controller (IDC) and PLL frequency synthesizer and to reset the device, its operation control function is said to be a standby function. |
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