A low-power microcontroller with on-chip self-tuning digitalclock-generator for variable-load applications
Olivieri, M.; Trifiletti, A.; De Gloria, A.
Computer Design, 1999. (ICCD apos;99) International Conference on
Volume , Issue , 1999 Page(s):476 - 481
Digital Object Identifier 10.1109/ICCD.1999.808583
Summary:Clock disabling for power management has been implemented in some
microcontrollers, but the wake-up time of Xtal/PLL-based systems is
incompatible with fast interrupt response. On the other hand, hardwired
on-chip clocking has been used for dedicated circuits. We illustrate the
design issues of a general-purpose microcontroller core with a
programmable on-chip fully-digital clock generator. The CPU is
compatible with the PIC16C57 instruction set and supports
software-controlled clocking modes-ranging from 44 MHz up to 124 MHz;
on-line self-tuning of the maximum full-speed frequency in case of
peak-performance requirements; ultra-fast wake-up even with totally
disabled clock generator-namely 8.6 ns
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