Apparatus and method for power saving of bus interface in portable terminal

1. A method for power saving in a portable terminal:

determining a throughput when processed by a bus;

determining a throughput required for a program; and,

selectively controlling a level of voltage applied to a bus clock interface coupled to a modem via the bus in order to control a bus clock according to the determined throughput.

2. The method of claim 1 , further comprising reducing the voltage level applied to the bus clock interface by a predetermined amount when a battery level of the portable terminal is lower than a threshold.

3. The method of claim 1 , wherein the controlling comprises lowering the voltage level to correspond with the determined throughput, which is higher than the throughput required for the program.

4. The method of claim 1 wherein the controlling step is raising the voltage level to correspond with the determined throughput, which is lower than the throughput required for the program.

5. The method of claim 1 , wherein the step of determining the throughput required for the program comprises determining the throughput required for the program based on a relation between application programs and corresponding throughputs.

6. The method of claim 1 , wherein the bus is a Secure Digital (SD) bus.

7. An apparatus for providing power saving in a portable terminal, comprising:

a modem for communicating with other nodes; and,

a power controller coupled to the modem using a bus for determining a throughput when processed by the bus, for determining a throughput required for a program and for selectively controlling a level of voltage of a bus clock interface connected with the modem in order to control a bus clock according to the determined throughput.

8. The apparatus of claim 7 , wherein the power controller reducing a voltage supplied to the bus clock interface coupled to the modem by a predetermined amount when a battery level of the portable terminal is lower than a threshold.

9. The apparatus of claim 7 , wherein the power controller lowers the level of voltage when the determined throughput is higher than the throughput required for the program.

10. The apparatus of claim 7 , wherein the power controller raises the voltage level when the determined throughput is lower than the throughput required for the program.

11. The apparatus of claim 7 , wherein the determined throughput required for the program is based on a relation between application programs and corresponding throughputs.

12. The apparatus of claim 7 , wherein the bus is a Secure Digital (SD) bus.

13. A non-transitory computer-readable recording medium having recorded thereon an application program for power saving in a portable terminal, comprising;

a first code segment for determining a throughput when processed by a bus;

a second code segment for determining a throughput required for a program; and,

a third code segment for selectively controlling a level of voltage applied to a bus clock interface coupled to a modem via the bus in order to control a bus clock according to the determined throughput.

14. The non-transitory computer-readable recording medium of claim 13 , further comprising;

a fourth code segment for reducing the voltage level applied to the bus clock interface by a predetermined amount when a battery level of the portable terminal is lower than a threshold.

15. The non-transitory computer-readable recording medium of claim 13 , wherein the controlling comprises lowering the voltage level to correspond with the determined throughput, which is higher than the throughput required for the program.

16. The non-transitory computer-readable recording medium of claim 13 , wherein the controlling step is raising the voltage level to correspond with the determined throughput, which is lower than the throughput required for the program.

17. The non-transitory computer-readable recording medium of claim 13 , wherein the second code segment comprises determining the throughput required for the program based on a relation between application programs and corresponding throughputs.

18. The non-transitory computer-readable recording medium of claim 13 , wherein the bus is a Secure Digital (SD) bus.