Message Edited by imajeff on 05-10-200611:26 AM
Hi imajeff,
thank you for the answer, but i don't understand the "Address Connection for MCU in Narrow Mode to One Byte- Wide Memory " ( Figure 3 in AN2287/D ).
All address lines are connected to the external memory, without paging. How does it work?
Thanks!
metboy
MCU External Device XADDR19 -- A19 ... XADDR14 -- A14 ADDR13 -- A13 ... ADDR0 -- A0
movb #$00,PPAGE lda $8000
lda $0000I assume you could get the same memory contents if PORTA was not mapped there, but there would be no way for external memory to distinguish between that and the 00:8000 address. Hopefully an expert will correct me if I'm wrong.
Message Edited by imajeff on 05-11-200611:21 AM
Message Edited by imajeff on 05-11-200602:17 PM
Message Edited by imajeff on 05-12-200607:54 AM
Message Edited by imajeff on 05-12-200607:58 AM
Hi imajef,
The DG256B manual says you need to refer to the "S12 Core User Guide". However, it looks like the original core guide has been pulled from the web. I'll get this sorted asap.
The two MMCV4 documents are the same - the difference in file size is because the original was a Motorola document and the new one is Freescale (plus about 200k of pdf bloat)
Steve wrote:Hi imajef,
The DG256B manual says you need to refer to the "S12 Core User Guide". However, it looks like the original core guide has been pulled from the web.