JPH10161780A - Portable terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable terminal reducing power consumption by detecting the operation of a keyboard to start a clock oscillator. SOLUTION: This portable terminal is provided with a CPU 1, the clock oscillator 5 and the operation keyboard 3 and communicates in a time division system. In this case, a key input detecting circuit 2 detecting the operation of the keyboard 3 and an interruption controller 4 are provided. When the portable terminal comes into a intermittently receiving state, the CPU 1 outputs a stoppage signal to stop a clock oscillating part 5 to enter a sleeping mode and when the keyboard 3 is operated, the circuit 2 detects it to send data to the CPU 1 and outputs a signal to an interruption controller 4. Then the controller 4 starts the part 5 and after the output becomes stable, the controller 4 supplies a clock to the CPU 1 and sends the signal to the CPU 1 to switch the sleeping mode to a normal mode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable terminal such as a portable telephone, and more particularly to a portable terminal consuming less power.

[0002]

2. Description of the Related Art FIG. 3 is a diagram showing a configuration example of a general portable terminal of this kind. As shown in the figure, a portable terminal includes an antenna 31 for communicating with a base station, an RF unit 32 for performing high-frequency signal processing, and a digital processing unit 3 for processing digital data.
3, an operation unit 34 operated by a push button, a keyboard, or the like;
The audio processing unit 35 includes a microphone, a speaker, and the like.

The digital processing unit 33 includes a high-speed CPU (Central Processing Unit), and processes digital data such as audio signal encoding / decoding, protocol processing, clock control and control signals, and the entire portable terminal. Control.

[0004] Portable terminals such as PHS portable telephones and PDC (personal digital cellular) portable telephones usually employ a TDMA (Time Division Multiple Access) system, which communicates with a base station using a control channel and transmits a signal to a base station. And responds to calls from the base station. However, it is not always continuously received, for example, PDC
In the intermittent reception state, the mobile phone receives intermittently from the base station, and in the intermittent reception state, performs reception once every 36 subframes (1 subframe = 20 ms) for a reception period of 6.6 ms. I'm in contact.

[0005] Conventionally, many portable terminals use a battery as a driving power source, and thus it is desired that power consumption be as small as possible. One of the ways to reduce power consumption in a mobile terminal is to set C when the mobile terminal is in a standby state and is in an intermittent reception state.
A method in which the PU is put into a sleep mode to stop the supply of the clock or a method in which the frequency of the clock is reduced has been adopted.

[0006] Even in the sleep mode, the CPU operates in the normal mode at a constant period in order to detect a call from the terminal itself.
The operation returns to the step of detecting whether the keyboard has been pressed. When the keyboard is pressed, the key is scanned, and the pressed key is recognized and processed.
Repeatedly entering the sleep mode again.

[0007]

However, as described above, the CPU returns from the sleep mode to the normal mode at regular intervals to detect a key press even during intermittent reception and scans. The current increases. Also, if the clock oscillator is stopped even during intermittent reception, there is a problem that the output has an initial unstable period when the oscillation is restarted, and it is difficult to adjust the timing at the time of reception. The supply is stopped, but the operation of the oscillator is not stopped. Therefore, there is a problem that the current consumption of the clock oscillator increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and has as its object to provide a portable terminal which reduces power consumption by detecting operation of a keyboard and activating a clock oscillator.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a CPU operating in a sleep mode and a normal mode and operating with a high-frequency clock signal. A key input detecting means for detecting that a keyboard has been operated in a portable terminal having a clock oscillating section for oscillating and a keyboard for operation and communicating in a time-division manner by the clock signal. , And an interrupt controller, when the portable terminal enters the intermittent reception state, the CPU outputs a stop signal to stop the operation of the clock oscillating unit, enter the sleep mode, and operate the keyboard. When the key input detecting means detects this, the key input detecting means sends the data to the CPU and outputs a signal to the interrupt controller.
Starts the clock oscillating unit, and after the output of the clock oscillating unit is stabilized, supplies a clock signal to the CPU and
A signal is sent to the PU to switch from the sleep mode to the normal mode.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing a configuration example of a mobile terminal of the present invention. As shown in the figure, the portable terminal of the present invention comprises a CPU 1, a key input detection circuit 2, a keyboard 3, an interrupt controller 4, a 12.6 MHz clock oscillating unit 5, a transmitting / receiving unit / digital processing unit 6, The configuration includes an audio unit 7 and an antenna 8.

In a normal reception state (during communication), the portable terminal transmits and receives radio waves from the base station using the antenna 8, the received signal is processed by the transmission / reception unit / digital processing unit 6, and the speaker / microphone of the audio unit 7 is used. You can make calls over. The operation is performed through the keyboard 3 and the whole is controlled by the output of the CPU 1. The present invention relates to starting / stopping of a clock oscillating unit 5 for operating a CPU 1, and includes a key input detecting circuit 2 for detecting the presence or absence of an input of a keyboard 3 and an interrupt controller 4, and a key board. -When the node 3 is operated, the 12.6 MHz clock oscillator 5 is automatically started, and the CP
A clock signal is supplied to U1.

FIG. 2 shows an operation flow of the portable terminal at the time of intermittent reception.
Is shown. The operation at the time of intermittent reception will be described with reference to FIG. C
PU1 operates in the normal reception state with a clock signal of 12.6 MHz and performs normal processing such as input processing from keyboard 3 and reception processing (step ST1). Then, it is determined whether or not the call has ended (step ST2). If the call has ended, the CPU 1 sends a stop signal to the clock oscillating unit 5 (step ST3) to stop the operation of the clock oscillating unit 5, and 12. The supply of the 6 MHz clock signal to the CPU 1 is stopped (step ST4). Thereby, CPU1
Enters the sleep mode (step ST5).

The CPU 1 keeps the output port at a low level, and detects that the key of the keyboard 3 has been pressed (step ST6).
Recognize by the output of From the key input detection circuit 2 to the CPU
Send data to 1 and PIRQ to interrupt controller 4
A (pre-interrupt) signal is sent (step ST7). At this time, the oscillation of 12.6 MHz is stopped, but it is 32 KHz.
The clock (for timing) is operating, and the PIRQ signal is generated by this clock signal.

When receiving the PIRQ signal, the interrupt controller 4 outputs a start signal to start the clock oscillating unit 5 (step ST8). 12.6M of the clock oscillator 5
Hz until the output signal in Hz is stabilized (step ST
9) Supply a 12.6 MHz clock signal to CPU 1 (step ST10). The interrupt controller 4 outputs an IRQ (interrupt) signal after the oscillation stabilization time,
PU1 is switched from sleep mode to normal mode. Thereafter, the process is repeated from step 1.

As described above, in this embodiment, the sleep mode is provided with the key input detecting circuit 2 and the interrupt controller 4, and the clock oscillating section 5 operates only when the keyboard 3 is operated. Since the 12.6 MHz clock is supplied to the CPU 1 and the CPU 1 is switched to the normal mode, there is no need to periodically scan the key during intermittent reception as in the prior art. Since the driving is stopped, the current consumption is reduced.

[0016]

As described above, according to the present invention, the following excellent effects are expected. A key input detecting means for detecting that the keyboard has been operated and an interrupt controller are provided, and when the portable terminal enters an intermittent receiving state, the CPU outputs a stop signal to operate the clock oscillating section. When the keyboard is operated and the keyboard is operated, the key input detecting means detects the input, sends data to the CPU, and outputs a signal to the interrupt controller. The interrupt controller activates the clock oscillating unit, and after the output of the clock oscillating unit is stabilized, supplies a clock signal to the CPU and sends a signal to the CPU to switch from the sleep mode to the normal mode. The operating current of the CPU and the operating current of the clock oscillator can be reduced. In addition, since it is not necessary to scan the keyboard at a constant cycle as in the related art,
The sleep mode time is prolonged, and the current consumption is reduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration example of a mobile terminal according to the present invention.

FIG. 2 is a diagram showing an operation flow of the portable terminal at the time of intermittent reception.

FIG. 3 is a diagram illustrating a configuration example of a general portable terminal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CPU 2 Key input detection circuit 3 Keyboard 4 Interrupt controller 5 Clock oscillation part 6 Transmission / reception part / digital processing part 7 Audio part 8 Antenna

Claims (1)

[Claims] 1. A CPU having an operation mode of a sleep mode and a normal mode and operating with a high-frequency clock signal, a clock oscillating section for oscillating the clock signal, and a keyboard for operation. A key input detecting means for detecting that the keyboard has been operated, and an interrupt controller, wherein the mobile terminal comprises: When entering the intermittent reception state, the CPU
Outputs a stop signal, stops the operation of the clock oscillating section, and enters a sleep mode. When the keyboard is operated, the key input detecting means detects the operation and outputs data to the CPU. And outputs a signal to the interrupt controller. The interrupt controller activates the clock oscillating unit, and supplies a clock signal to the CPU after the output of the clock oscillating unit is stabilized. Signal from sleep mode to normal mode.
Mobile terminal characterized by switching to a mobile terminal.