Siemens EF 88H Series Manuel d'utilisateur télécharger pdf (Page 19)

Semiconductor Group 3 - 11

Memory Organization

Figure 3-2

Write Page Address to Port 2

MOV P2, pageaddress will write the page address to Port 2 and XPAGE-Register.

When external RAM is to be accessed in the XRAM address range (F800

- FFFF

) XRAM has to

be disabled. When additional external RAM is to be addressed in an address range ≤ XRAM

(F800

) XRAM may remain being enabled and there is no need to overwrite XPAGE by a second

move.

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Siemens EF 88H Series Manuel d'utilisateur Page 19