Microcontroller performing safe recovery from standby mode

Details Microcontroller performing safe recovery from standby mode Microcontroller performing safe recovery from standby mode

2006-09-05

2006-09-05

Pan, Daniel H. (Department: 2183)

Electrical computers and digital processing systems: processing

Processing control

Processing sequence control

C712S247000, C712S248000, C712S229000, C710S261000, C710S262000, C714S015000, C713S401000, C713S601000

Reexamination Certificate

active

07103758

ABSTRACT:
A microcontroller has a memory storing a program with an instruction that causes the microcontroller's central processing unit to enter a standby mode, in which data output from the memory is halted. The standby mode is exited by input of an interrupt. The microcontroller also has a control circuit that, by storing the next few program instructions internally before placing the memory in standby, or by delaying the interrupt signal, provides extra time for memory operation to stabilize on exit from the standby mode. Malfunctions on recovery from standby are thereby prevented, and the microcontroller can conserve power by placing the memory in a deep standby mode with a comparatively long recovery time.

REFERENCES:
patent: 5564028 (1996-10-01), Swoboda et al.
patent: 5701480 (1997-12-01), Raz
patent: 5925139 (1999-07-01), Yamada et al.
patent: 6334167 (2001-12-01), Gerchman et al.

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