Mobile telephone terminal having selectively used processor unit for low power consumption

• US 5,058,203 A
• Filed: 05/22/1989
• Issued: 10/15/1991
• Est. Priority Date: 05/21/1988
• Status: Expired due to Term

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Inagami, Fujio
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): FAILE, ANDREW I
• Application Number:
  US07/354,989
• Time in Patent Office: 876 Days
• Field of Search: 455/343, 455/89-90, 455/127, 379/61, 379/63, 320/31-32, 340/311.1, 340/825.44, 340/825.48
• US Class Current: 455/574
• CPC Class Codes: H04W 52/0274 by switching on or off the equipment or parts thereof
• CPC Class Codes: H04W 52/029 reducing the clock frequency of the controller
• CPC Class Codes: H04W 52/0293 having a sub-controller with a low clock frequency switching on and off a main controller with a high clock frequency
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A mobile telephone terminal powered by a battery, which terminal is mainly comprised of a processor unit and a logic LSI unit as a control part thereof. The processor unit handles first control functions which are not used frequently but which are complicated and operate at a high clock speed. The logic LSI unit handles second control functions which are used constantly and frequently at a low clock speed. The processor unit is activated intermittently on demand by the logic LSI unit and thereby reduces power consumption.

Claims

1. A mobile telephone terminal powered by a battery, comprising:

radio means for transmitting and receiving radio frequency signals; and

control means for performing first and second control functions, said control means including

processor means for processing said first control functions in response to an activation signal, said processor means includes means for placing said processor means into a holding state when said processor means finishes processing said first control functions; and

logic means for processing said second control functions and for providing said activation signal to said processor means when first control functions need to be processed, said logic means includes clock providing means for selectively providing a high speed clock signal to said processor means based on said holding state and blocking means for blocking said high speed clock signal from said processor means when said processor means is in said holding state.

2. A mobile telephone terminal as set forth in claim 1, wherein said logic means includes:

receiving means for receiving a logic signal having a first state when said processor means is in said holding state and a second state when said processor means is in an operating state.

3. A mobile telephone terminal as set forth in claim 1, wherein said means for placing said processor means into said holding state includes:

means for executing a "Wait for Interrupt" instruction.

4. A mobile telephone terminal as set forth in claim 3, wherein said logic means includes:

means for issuing an interrupt request to said processor means if an interrupt occurs in said logic means, said interrupt occurs when said first control functions need to be processed.

5. A mobile telephone terminal as set forth in claim 4, wherein said processor means includes:

a read only memory for storing a program to operate said processor unit, said program is subject to external commands issued from said logic means.

6. A mobile telephone terminal as set forth in claim 4, wherein said means for issuing said interrupt request includes:

immediate interrupt means for issuing said interrupt request immediately after the occurrence of said interrupt if said interrupt occurs when said logic signal is in said second state.

7. A mobile telephone terminal as set forth in claim 4, wherein said means for issuing said interrupt request includes:

delayed interrupt means for issuing said interrupt request after a predetermined delay time from the occurrence of said interrupt if said interrupt occurs when logic signal is in said first state.

8. A mobile telephone terminal as set forth in claim 7, wherein said predetermined delay time is a time required for said clock providing means to provide said high speed clock signal.

9. A mobile telephone terminal as set forth in claim 8, wherein said clock providing means includes:

means for obtaining said high speed clock signal by frequency dividing a master clock signal provided from a master clock; and

said logic means includes;

a delay means for providing said predetermined delay time.

10. A mobile telephone terminal as set forth in claim 9, wherein said clock providing means further includes:

first logic means, responsive to said logic signal and said interrupt, for providing said master clock signal regardless of the existence of an interrupt when said logic signal is in said second state, and for providing said master clock signal at the occurrence of said interrupt when said logic signal is in said first state.

11. A mobile telephone terminal as set forth in claim 9, wherein said means for issuing said interrupt request further includes:

second logic means, responsive to said logic signal and said interrupt, for producing said interrupt request immediately after said interrupt when said logic signal is in said second state, and for producing an interrupt request after said predetermined delay time when said logic signal is in said first state.

12. A mobile telephone terminal as set forth in claim 1, wherein said processor means includes:

means for executing terminal control, data transmission processing, and low speed timer management;

said logic means including;

means for executing said data reception processing and high speed timer management.

13. A mobile telephone terminal as set forth in claim 12, wherein said processor means includes:

means for controlling at least call origination, call termination and registration of the location of the mobile telephone terminal.

14. A mobile telephone terminal as set forth in claim 12, wherein said logic means includes:

means for executing word synchronization of received data, for executing a decision by majority for words transmitted repeatedly as said received data so that non-normal bits of the words are corrected based on the majority of the bits, for executing a decision by majority for busy/idle indication bits so that the busy/idle state is determined based on the majority of the busy/idle indication bits, and for executing error correction of said received data in terms of a Bose-Chaudhuri-Hocqueghem code.

15. A mobile telephone terminal as set forth in claim 1, wherein at least one of said processor means and said logic means includes a CMOS device.

16. A mobile telephone terminal as set forth in claim 1, wherein said first control functions include control functions that are used infrequently and operate at a high clock speed.

17. A mobile telephone terminal powered by a battery, comprising:

radio means for transmitting and receiving radio frequency signals; and

control means for performing first control functions, and for processing second control functions, at least one of said first and second control functions include functions for controlling said radio means;

said control means includes;

processor means for processing said first control functions in response to an activation signal and for entering a holding state when said processing means finishes processing said first control functions; and

logic means for processing said second control functions, for providing said activation signal and a high speed clock signal to said processing means when said first control functions are to be processed, and for blocking said high speed clock signal from said processing means when said processing means is in said holding state.

18. A method of controlling a battery powered mobile telephone terminal, including a radio unit for transmitting and receiving radio frequency signals and a control unit for performing control functions, said control unit includes a processor unit and a logic unit, comprising the steps of:

(a) defining first control functions;

(b) defining second control functions;

(c) processing said second control functions in the logic unit;

(d) determining if said first control signals are to be processed;

(e) activating the processor unit and providing a high speed clock signal to the processor unit in response to the determination that said first control signals are to be processed;

(f) processing said first control signals in the processor unit in response to the activation of the processor unit; and

(g) switching said processor unit into a holding state and blocking said high speed clock signal from the processor unit in response to the determination that said first control signals are not to be processed.