DS80C390_00 Datasheet, PDF (89/155 Pages) Dallas Semiconductor – High-Speed Microcontroller User’s Guide Supplement

DS80C390 High-Speed Microcontroller User’s Guide Supplement
MOVX Extended Address Register (MXAX)
7
6
5
4
3
2
1
0
SFR EAh
RW-0 RW-0 RW-0 RW-0 RW-0 RW-0 RW-0 RW-0
R=Unrestricted Read, W=Unrestricted Write, -n=Value after Reset
Bits 7-0
MOVX Extended Address Register. This register is concatenated with P2 and
R1 or R0 to form the 22-bit address when executing a MOVX @Ri, A or MOVX
A, @Ri instruction in either the 24-bit paged or 24-bit contiguous modes. The
DPTR related MOVX instructions do not utilize the P2 and MXAX register. Note
that the MXAX register is only used when the processor is operating in either the
paged or contiguous addressing modes.
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