Intel 8XC196NP, 80C196NU, Microcontroller manual Selecting a Window of the Upper Register File

MEMORY PARTITIONS

WSR1	Address:	0015H
(80C196NU)	Reset State:	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.

80C196NU

7

— W6 W5 W4

0

W3 W2 W1 W0

Bit	Bit	Function
Number	Mnemonic
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

	WSR or WSR1 Value	WSR or WSR1 Value	WSR Value for
Peripheral	for 32-byte Window	for 64-byte Window	128-byte Window
	(00E0–00FFH or 0060–007FH)	(00C0–00FFH or 0040–007FH)	(0080–00FFH)
EPORT†	7FH†
Ports 1–4	7EH	3FH†
PWM and SIO	7DH
EPA and Timers	7CH	3EH	1FH†
Chip selects 4–5	7BH
Chip selects 0–3	7AH	3DH	1EH

†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	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)
03E0–03FF	5FH
03C0–03DF	5EH	2FH
03A0–03BF	5DH
0380–039F	5CH	2EH	17H

5-15