On Wed, Sep 7, 2011 at 6:48 PM, William "Chops" Westfield w= rote: > > On Sep 7, 2011, at 3:20 PM, V G wrote: > > >> [a true ICE] emulates the real PIC, typically with a special silicon. > >> > > What is the purpose of this? > > > cycle-by-cycle visibility of the chip internal state. Code in RAM for > easy reloading. Infinite breakpoints, backtrace and other logic- > analyzer-like functionality, all operating in real time (or near real > time.) > > > > Were the old PICs incapable of in circuit debugging? > > > Yes, they were incapable. The idea of having an "intelligent" on-chip > debug module accessed via a very small number of external pins > (perhaps multiplexed with normal functions) is relatively recent. The > debug module on a mid-sized ARM probably has more transistors than > many of the early PICs. > > Thanks! --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .