Title:
SEMICONDUCTOR INTEGRATED CIRCUIT AND INTERRUPT REQUEST OUTPUT METHOD FOR SEMICONDUCTOR INTEGRATED CIRCUIT
Document Type and Number:
Japanese Patent JP3810361
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To externally notify an interrupt request from an external interrupt factor even when an internal power source is cut off, in a semiconductor integrated circuit for externally outputting a logical sum output of an external interrupt factor and an internal interrupt factor as an interrupt request signal.
SOLUTION: A resistance element 115 connects an interrupt request signal output cell 107 and an external interrupt factor input cell 108 via a bypass. When an internal power source is cut off, the interrupt request signal output cell 107 is controlled to high impedance. When the internal power source is cut off, an interrupt request signal from an external interrupt factor is notified to a CPU.
Inventors:
Shinichi Abe
Application Number:
JP2002320215A
Publication Date:
August 16, 2006
Filing Date:
November 01, 2002
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
G06F9/48; G06F1/16; G06F1/30; G06F9/46; G11C5/14; H01L27/00; H01L31/109; (IPC1-7): G06F9/46
Domestic Patent References:
| JP9282264A | ||||
| JP61028154A | ||||
| JP3271831A | ||||
| JP10161968A | ||||
| JP62296235A | ||||
| JP6223029A |
Attorney, Agent or Firm:
Shohei Oguri
Hironori Honda
Toshimitsu Ichikawa
Takeshi Takamatsu
Hironori Honda
Toshimitsu Ichikawa
Takeshi Takamatsu