Intel Microcontroller, 80C196NU, 8XC196NP manual Addressing a Location Through a Window

8XC196NP, 80C196NU USER’S MANUAL

Table 5-9. Selecting a Window of the Upper Register File (Continued)

Register RAM	WSR or WSR1 Value	WSR or WSR1 Value	WSR Value
Locations	for 32-byte Window	for 64-byte Window	for 128-byte Window
(Hex)	(00E0–00FFH or 0060–007FH)	(00C0–00FFH or 0040–007FH)	(0080–00FFH)
0360–037F	5BH
0340–035F	5AH	2DH
0320–033F	59H
0300–031F	58H	2CH	16H
02E0–02FF	57H
02C0–02DF	56H	2BH
02A0–02BF	55H
0280–029F	54H	2AH	15H
0260–027F	53H
0240–025F	52H	29H
0220–023F	51H
0200–021F	50H	28H	14H
01E0–01FF	4FH
01C0–01DF	4EH	27H
01A0–01BF	4DH
0180–019F	4CH	26H	13H
0160–017F	4BH
0140–015F	4AH	25H
0120–013F	49H
0100–011F	48H	24H	12H

5.3.2Addressing a Location Through a Window

After you have selected the desired window, you need to know the direct address of the memory location (the address in the lower register file). For SFRs, refer to the WSR tables in Appendix C. For register file locations, calculate the direct address as follows:

1.Subtract the base address of the area to be remapped (from Table 5-10 on page 5-17) from the address of the desired location. This gives you the offset of that particular location.

2.Add the offset to the base address of the window (from Table 5-11). The result is the direct address.

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