Intel 80C196NU ユーザーズマニュアル

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.

80C196NU

—

Bit

Number

Bit

Mnemonic

Function

—

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

3EH

EPA and Timers

7CH

Chip selects 4–5

7BH

3DH

1EH

Chip 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

2EH

0380–039F

5CH