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8XC196NP, 80C196NU USER’S MANUAL
5-16
5.3.2 Addressing 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.
0360–037F 5BH
2DH
16H
0340–035F 5AH
0320–033F 59H
2CH0300–031F 58H
02E0–02FF 57H
2BH
15H
02C0–02DF 56H
02A0–02BF 55H
2AH0280–029F 54H
0260–027F 53H
29H
14H
0240–025F 52H
0220–023F 51H
28H0200–021F 50H
01E0–01FF 4FH
27H
13H
01C0–01DF 4EH
01A0–01BF 4DH
26H0180–019F 4CH
0160–017F 4BH
25H
12H
0140–015F 4AH
0120–013F 49H
24H0100–011F 48H
Table 5-9. Selecting a Window of the Upper Register File (Continued)
Register RAM
Locations
(Hex)
WSR or WSR1 Value
for 32-byte Window
(00E0–00FFH or 0060–007FH)
WSR or WSR1 Value
for 64-byte Window
(00C0–00FFH or 0040–007FH)
WSR Value
for 128-byte Window
(0080–00FFH)