Radio selective calling receiver

• US 5,956,623 A
• Filed: 06/18/1997
• Issued: 09/21/1999
• Est. Priority Date: 06/18/1996
• Status: Expired due to Term

• Current Assignee: Lenovo Innovations Ltd Hong Kong (Lenovo Group Ltd.)
• Original Assignee: NEC Corporation
• Inventors: Narusawa, Hideki
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): APPIAH, CHARLES NANA
• Application Number:
  US08/878,349
• Time in Patent Office: 825 Days
• Field of Search: 455/575, 455/38.1, 455/38.3, 455/38.2, 455/230, 455/343, 340/825.44, 340/311.1, 340/825.47
• US Class Current: 340/7.39
• CPC Class Codes: G08B 5/229 with other provisions not elsewhere provided for
• 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 radio selective calling receiver which has at least a switch operated by a user to perform operations including resetting of sound generation, ON/OFF of display, time correction, and read access to a stored message and whose switch interrupt processing performed by operating the switch is performed by starting a main clock, includes a radio unit operation determination unit for determining whether a radio unit which demodulates a radio signal received from a base station is performing a reception operation. If the radio unit operation determination unit determines that the radio unit is performing the reception operation, switch interrupt processing is not performed even when the user operates the switch. With this arrangement, an erroneous operation due to harmonic noise generated from the main clock in the reception operation and noise generated from the CPU operated by the main clock during the reception operation of the radio unit can be prevented.

Claims

1. A radio selective calling receiver comprising:

at least one switch operated by a user to perform operations other than for supplying or terminating power to the receiver, wherein switch interrupt processing performed by operating said switch is performed by starting a main clock;

a radio unit operation determination unit for determining whether a radio unit which demodulates a radio signal received from a base station is performing a reception operation,

wherein if said radio unit operation determination unit determines that said radio unit is performing the reception operation, switch interrupt processing is not performed even when the user operates said switch.

2. The receiver according to claim 1, wherein if said radio unit operation determination unit determines that said radio unit is performing the reception operation, information representing inhibition of switch interrupt processing is displayed.