W742S81A Datasheet, PDF (7/47 Pages) Winbond – 4 BIT MICROCONTROLLER

W742S81A
0000H
:
1st page
03FFH
0400H
:
07FFH
0800H
:
2nd page 0BFFH
0C00H
:
0FFFH
:
16 bits
Look-up table address:
0000H
:
0FFFH
:
:
Look-up table address:
2000H
:
2FFFH
Look-up table address:
3000H
:
3FFFH
:
Each element (4 bits) of the look-up table
Look-up table address:
1000H
:
1FFFH
:
3800H
:
8th page 3BFFH
3C00H
:
3FFFH
:
Look-up table address:
E000H
:
EFFFH
Look-up table address:
F000H
:
FFFFH
16384 x 16 bits
Figure 6-1 Program Memory Organization
6.3.1 ROM Page Register (ROMPR)
The ROM page register is organized as a 4-bit binary register. The bit descriptions are as follows:
3
2
1
0
ROMPR
W
W
W
Note: W means write only.
Bit 3 is reserved.
Bit 2, Bit 1, Bit 0 ROM page preselect bits:
000 = ROM page 0 (0000H - 07FFH)
001 = ROM page 1 (0800H - 0FFFH)
010 = ROM page 2 (1000H - 17FFH)
011 = ROM page 3 (1800H - 1FFFH)
100 = ROM page 4 (2000H - 27FFH)
101 = ROM page 5 (2800H - 2FFFH)
110 = ROM page 6 (3000H - 37FFH)
Publication Release Date: March 2003
-7-
Revision A1