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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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UPSD325X Datasheet(PDF) 45 Page - STMicroelectronics |
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UPSD325X Datasheet(HTML) 45 Page - STMicroelectronics |
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45 / 176 page  45/176 µPSD325X DEVICES Idle Mode The instruction that sets PCON.0 is the last in- struction executed in the normal operating mode before Idle Mode is activated. Once in the Idle Mode, the CPU status is preserved in its entirety: Stack pointer, Program counter, Program status word, Accumulator, RAM and All other registers maintain their data during Idle Mode. There are three ways to terminate the Idle Mode. s Activation of any enabled interrupt will cause PCON.0 to be cleared by hardware terminating Idle mode. The interrupt is serviced, and following return from interrupt instruction RETI, the next instruction to be executed will be the one which follows the instruction that wrote a logic ’1’ to PCON.0. s External hardware reset: the hardware reset is required to be active for two machine cycle to complete the RESET operation. s Internal reset: the microcontroller restarts after 3 machine cycles in all cases. Power-Down Mode The instruction that sets PCON.1 is the last exe- cuted prior to going into the Power-down Mode. Once in Power-down Mode, the oscillator is stopped. The contents of the on-chip RAM and the Special Function Register are preserved. The Power-down Mode can be terminated by an external RESET. |
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