For those with 6809 experience
brain at jbrain.com
Thu Mar 5 20:11:04 CST 2020
On 3/3/2020 8:39 AM, osi.superboard via cctalk wrote:
> My assumption is, that the LDA address access is too late at the end
> of the instruction cycle, and the CPU already started the next
> instruction cycle internally. HALT will be acknowledged only during
> the instruction cycle following the LDA.
> It would be interesting to measure, when the LDA pulls down the HALT
> compared to the last instruction cycle signal (LIC). Maybe using LDD
> will work better, because the HALT signal will be asserted one clock
> before the instruction cycle ends.
Which is exactly what I ended up doing:
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