SDA55XX Datasheet, PDF (110/230 Pages) Infineon Technologies AG – Preliminary & Confidential

Preliminary & Confidential
SDA 55xx
Memory Organization
The operations to the extended memory space are controlled by four special function
registers called MEX1, MEX2, MEX3 and MEXSP.
The functionality for memory extension is provided by a module Memory management
unit (MMU) which includes the four SFR registers MEX1, MEX2, MEX3 and MEXSP.
10.3.1 Memory extension registers
The following registers are present in the Memory management unit.
These registers can be read and written through MOV instructions like any other SFR
registers. Except for CB bits in MEX1 which are read only they can only be written by
MMU. During normal operation user must not write in the MEXSP.
Hr€‚…’ Ã@‘‡r†v‚ÃSrtv†‡r…Ã
Default after reset: 00_H
06%
CB19 CB18 CB17
MEX1
CB16 NB19
NB18
SFR Address 94_H
/6%
NB17 NB16
1%
&%
&RPPHQWV
Next Bank; R/W
Current Bank; Read Only;
None
Semiconductor Group
110
User’s Manual July 99