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What's the minimal 3V 8051 that has idle mode that can be awaken by serial port reception on a single line, i.e., the receiver interrupt. This is for a battery-powered application where the only input is level-shifted RS232.
I'm not sure how this is a Keil C51 question (one of this forum's topics). Have you tried news:comp.arch.embedded yet?
Philips LPC7.. series ($0.50 - $2) depending on quantity. For non-Keil questions 8052.com is a good place Erik