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Zilog Z8S180 problems

I seem to be unable to access the new registers on the Zilog Z8S180 CPU, things like the Clock Multiplier register, the additional DMA register etc. When I try to write to these registers my writes seem to be ignored and when I read them back I read FF from most 00 from one. Anyone else having problems with this chip or know the secret code to make it work? :) For all the world it's behaving as if it were a Z180 rather than a S180. I have tried two different chips, one date coded 0106 and the other 0348 - same problem with both.

Mike Harding

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Mike Harding
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Did you accidentally write to ICR (3Fh) relocating the internal registers? I've successfully used the BRG and clock doubler in the "S" parts for many years.

Bill Softools

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Bill A.

Thanks Tilmann, those are the instruction I'm using. Are you using this CPU - especially the clock doubling function, with success?

Mike Harding

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Mike Harding

Don't think so Bill. I can still write and read from the other registers OK, 1F etc and the two locations either side of the new DMA register (2C and 2E? - don't have the data book here) plus all the usual peripheral registers.

Mike Harding

Reply to
Mike Harding

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