Microcontroller Operable in normal and low speed modes...

Details Microcontroller Operable in normal and low speed modes... Microcontroller Operable in normal and low speed modes...

2006-08-15

2006-08-15

Browne, Lynne H. (Department: 2116)

Electrical computers and digital processing systems: support

Computer power control

Power conservation

C713S310000, C711S102000, C711S104000

Reexamination Certificate

active

07093148

ABSTRACT:
A microcontroller includes a clock circuit with a register storing clock frequency information corresponding to a low speed or normal mode respectively operated by a low frequency or normal clock, which outputs a first signal according to a value set in the register when the low speed mode is designated during operation in the normal mode, a DRAM holding data, in the low speed mode, by operation in a self-refresh mode, and outputting a confirmation signal indicating switching to that mode, a DRAM circuit switching the DRAM to that mode based on the first signal, a ROM operated in the low speed mode, a remap circuit controlling an address circuit based on the confirmation signal, and outputting a second signal for switching a program execution address from the DRAM to an address of the ROM to control an address space in which a program is executed, the address circuit switching the address space based on the second signal.

REFERENCES:
patent: 5592634 (1997-01-01), Circello et al.
patent: 6374124 (2002-04-01), Slabinski
patent: 6446184 (2002-09-01), Dell et al.
patent: 6449203 (2002-09-01), Cowles et al.

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