W742E Datasheet, PDF (13/60 Pages) Winbond – 4 BIT MICROCONTROLLER

W742E/C811
5.3.1 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 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)
111 = ROM page 7 (3800H - 3FFFH)
5.3.2 ROM Addressing Mode
1. Direct Addressing
Bit 13-0 13 12 11 10 9 8 7 6 5 4 3 2 1 0
PC A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
2. Far Jump or Call
Bit 13-0 13 12 11 10 9 8 7 6 5 4 3 2 1 0
PC
P2 P1 P0 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
P0-2 is ROM page register(ROMPR)
Example:
MOV ROMPR,#I
JMP Label_A
or
MOV ROMPR,#I
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Publication Release Date: December 2000
Revision A1