Why not use a faster osc?  10Mhz would both speed startup and reduce the
temp dependent freq variation by a factor of ten, right?

>I want to use my '84 as a code receiver and have it sleep
>between transmissions. Codes are sent at 1200 baud and I use
>a 1MHz resonator as clock source (configured as XT type).
>Is the wakeup time short enough and stable enough to not miss
>the first information bit?