US 2005/0240789 A1 · Power control apparatus, electronic apparatus, and portable communications terminal

Abstract

A voltage detector detects a start of power supply from a battery. When the voltage detector detects the start of power supply, a counter starts counting the clocks of an RTC. A first comparator compares a count value stored in a first non-volatile memory and the count value of the counter and outputs a CPU reset release signal when these count values match with each other. A second comparator compares a count value N stored in a second non-volatile memory and the count value of the counter and, when these count values coincide with each other, performs power-on operation of a regulator which outputs I/O power for the CPU. Accordingly, timing of CPU reset release and timing of regulator power-on can be readily modified without aluminum modification.

Claims15

Dependent claims

A power control apparatus comprising:

a detector for detecting start of power supply;
a timing determining unit for determining at least one of timing of CPU reset release and timing of I/O power supply to the CPU after the start of power supply is detected by the detector;
a rewritable non-volatile memory for storing a control values for controlling the timing determined by the timing determining unit;
and
a rewriting interface for rewriting the control values stored in the non-volatile memory.

2 more elements

An electronic apparatus comprising:

a CPU;
constituent elements having respective operations controlled by the CPU;
and
a power control circuit including:
a detector which detects a start of power supply;
a timing determining unit which determines at least one of timing of reset release of the CPU and timing of I/O power supply to the CPU after the start of power supply is detected by the detector;
a rewritable non-volatile memory which stores control values for controlling the timing determined by the timing determining unit;
and
a rewriting interface which rewrites the control values stored in the non-volatile memory.

6 more elements

A portable communications terminal comprising:

a communication circuit for performing wireless communication;
a CPU for performing control of at least wireless communications;
and
a power control circuit including:
a detector for detecting a start of power supply;
a timing determining unit for determining at least one of timing of reset release of the CPU and timing of I/O power supply to the CPU after the start of power supply is detected by the detector;
a rewritable non-volatile memory for storing control values for controlling the timing determined by the timing determining unit;
and
a rewriting interface for rewriting the control values stored in the non-volatile memory.

6 more elements

Dependencies are inferred from the claim text.

Power control apparatus, electronic apparatus, and portable communications terminal

Life of this patent

Power control apparatus, electronic apparatus, and portable communications terminal

Life of this patent

Abstract

Claims15