Z8S180 vs Z80180

[Jan Vacek]

Hello,
please is there any problem to replace Z8S180 with Z80180?
I read the data sheet http://www.zilog.com/docs/z180/um0050.pdf
and the difference is perhaps only in Low Power Modes. Do you have experience with Z80180?
Thank you
Jan

[Bill McMullen]

The best answer to that question is to look at the Z8S180/L180 Errata ZMP0599.  I've worked a fair amount with the Z180 and the two most obvious potential gotchas with the S180 and L180 are:
- CSI/O TXS always returning to high after completion
- STAT1 in CNTLB1 always reads as 0

There are S180/L180 enhanced features which means code that uses these enhancements will not be compatible with the 64180 or original Z180.  Although it's not obvious in the datasheets, in my experience using S180 frequency doubling, the CMR register must be written before the CCR register.  Also if using the ASTCxH / ASTCxL BRG then although the manual states ASTCxH is initialized to zero upon reset, on some (all?) mask versions it must actually be written as zero before communication will work.

[Jan Vacek]

Hello,
many thanks for the info and recommendations.

I would like to use Z80180 in RC-2014 module with ROMWBW, Small Computer Monitor and of course CP / M. 

Please, there is someone who will use CPU Z80180 in SC130 or SC126 boards.

Thank you very much 

Jan

Dne sobota 25. prosince 2021 v 0:11:49 UTC+1 uživatel Bill McMullen napsal: