Portable communication terminal, communication method of the portable communication terminal, program, and recording medium having the program recorded thereon

• US 20030064703A1
• Filed: 09/12/2002
• Published: 04/03/2003
• Est. Priority Date: 09/27/2001
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Toshida, Masahiro
• Granted Patent: US 7,003,277 B2
• Time in Patent Office: Days
• US Class Current: 455/403
• CPC Class Codes: H04W 52/029 reducing the clock frequency of the controller
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A communication control processor controls communication of a portable communication terminal with an exterior thereof. A data processing control processor performs communication with the communication control processor, and controls a ROM, a RAM, an operating unit, and a display unit. The data processing control processor is supplied with a first clock signal, while the communication control processor is supplied with a second clock signal based on the first clock signal from the data processing control processor. Thus, each of the processors can transmit UART data even when the other processor is in a sleep state without knowing it, and the other processor can receive the data without an error in reception. Furthermore, the data processing control processor and the communication control processor can turn on/off a high-speed clock (sleep control) independently of each other. Thus, sleep time can be maximized, and consequently power consumption can be reduced.

Claims

1. A portable communication terminal comprising:

communication control means for controlling communication of said portable communication terminal with an exterior thereof;

data processing control means for performing communication with said communication control means; and

first clock signal supply means for supplying a first clock signal to said data processing control means;

wherein said data processing control means includes second clock signal supply means for supplying a second clock signal based on said first clock signal to said communication control means.

2. A portable communication terminal as claimed in claim 1,

wherein said second clock signal supply means includes frequency dividing means for dividing frequency of said first clock signal.

3. A portable communication terminal as claimed in claim 1,

wherein two kinds of signals, that is, a high-speed clock signal and a low-speed clock signal are supplied as said first clock signal;

and

said portable communication terminal further includes clock selecting means for supplying said high-speed clock signal as said first clock signal to said second clock signal supply means when said data processing control means is in an awake state, and supplying said low-speed clock signal as said first clock signal to said second clock signal supply means when said data processing control means is in a sleep state or in a state of transition to the awake state.

4. A portable communication terminal as claimed in claim 1,

wherein said data processing control means is shifted from a sleep state to an awake state using as a reference timing of receiving a signal from said communication control means.

5. A portable communication terminal as claimed in claim 4,

wherein said data processing control means is shifted from the sleep state to the awake state immediately after receiving the signal from said communication control means.

6. A portable communication terminal as claimed in claim 4,

wherein said data processing control means is shifted from the sleep state to the awake state after receiving the signal from said communication control means and receiving a signal of a predetermined magnitude.

7. A portable communication terminal as claimed in claim 1,

wherein said communication control means is shifted from a sleep state to an awake state using as a reference timing of receiving a signal from said data processing control means.

8. A portable communication terminal as claimed in claim 7,

wherein said communication control means is shifted from the sleep state to the awake state immediately after receiving the signal from said data processing control means.

9. A portable communication terminal as claimed in claim 7,

wherein said communication control means is shifted from the sleep state to the awake state after receiving the signal from said data processing control means and receiving a signal of a predetermined magnitude.

10. A communication method of a portable communication terminal, said portable communication terminal performing communication with an exterior thereof and including communication control means for controlling the communication with the exterior and data processing control means for performing communication with said communication control means, said communication method comprising:

a first clock signal supply step for supplying a first clock signal to said data processing control means; and

a second clock signal supply step for supplying a second clock signal based on said first clock signal from said data processing control means to said communication control means.

11. A program for a computer to perform communication processing of a portable communication terminal, said portable communication terminal performing communication with an exterior thereof and including communication control means for controlling the communication with the exterior and data processing control means for performing communication with said communication control means, said program comprising:

a first clock signal supply step for supplying a first clock signal to said data processing control means; and

a second clock signal supply step for supplying a second clock signal based on said first clock signal from said data processing control means to said communication control means.

12. A computer readable recording medium having a program recorded thereon, said program being for a computer to perform communication processing of a portable communication terminal, said portable communication terminal performing communication with an exterior thereof and including communication control means for controlling the communication with the exterior and data processing control means for performing communication with said communication control means, said program including:

a first clock signal supply step for supplying a first clock signal to said data processing control means; and

a second clock signal supply step for supplying a second clock signal based on said first clock signal from said data processing control means to said communication control means.