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5-15
MEMORY PARTITIONS
WSR1
(80C196NU)
Address:
Reset State:
0015H
00H
Window selection 1 (WSR1) register selects a 32- or 64-byte segment of the upper register file or
peripheral SFRs to be windowed into the middle of the lower register file, below any window selected
by the WSR.
7 0
80C196NU
— W6 W5 W4 W3 W2 W1 W0
Bit
Number
Bit
Mnemonic
Function
7 — Reserved; always write as zero.
6:0 W6:0 Window Selection
These bits specify the window size and window number. See Table 5-8 on
page 5-15 or Table 5-9 on page 5-15.
Figure 5-6. Window Selection 1 (WSR1) Register
Table 5-8. Selecting a Window of Peripheral SFRs
Peripheral
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)
EPORT
†
7FH
†
3FH
†
1FH
†
Ports 1–4 7EH
PWM and SIO 7DH
3EHEPA and Timers 7CH
Chip selects 4–5 7BH
3DH 1EHChip selects 0–3 7AH
†
For the 8XC196NP, the EPORT SFRs are memory-mapped SFRs. They must be accessed with
indirect, indexed, or extended addressing; they cannot be windowed.
Table 5-9. Selecting a Window of the Upper Register File
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)
03E0–03FF 5FH
2FH
17H
03C0–03DF 5EH
03A0–03BF 5DH
2EH0380–039F 5CH