Siemens EF 88H Series Manuel d'utilisateur télécharger pdf (Page 86)

Device Specification

Semiconductor Group 7-24

Multiple Datapointers

As a functional enhancement to standard 8051 controllers, the SAB 80C517A contains eight

16-bit datapointers. The instruction set uses just one of these datapointers at a time. The

selection of the actual datapointer is done in special function register DPSEL (data pointer

select, addr. 92

). Figure 3 illustrates the addressing mechanism.

Figure 3

Addressing of External Data Memory

1 2 ... 81 82 83 84 85 86 87 88 89 90 91 ... 136 137

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Siemens EF 88H Series Manuel d'utilisateur Page 86