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The auto-baud routine of the bootstrap loader does not always function reliably
(observed as garbled information instead of loader banner).
Functionality is better at lower baud rates. Experiments show that the maximum
reliable baud rate for any given crystal frequency is given by the equation:
fOSC / 1152 = Max Baud
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To enter loader mode, PSEN is sampled after reset is pulled
high and EA is pulled low. This dictates that the transition
of PSEN from high to low should be delayed from the onset of
reset and EA by 8 clock cycles.
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