W742C813 Datasheet, PDF (10/56 Pages) Winbond – 4 BIT MICROCONTROLLER

W742E/C813
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 R/W R/W R/W R/W
Note: W means write only.
Bit 3, Bit 2, Bit 1, Bit 0 ROM page bits:
0000 = ROM page 0 (0000H - 07FFH)
0001 = ROM page 1 (0800H - 0FFFH)
0010 = ROM page 2 (1000H - 17FFH)
0011 = ROM page 3 (1800H - 1FFFH)
0100 = ROM page 4 (2000H - 27FFH)
0101 = ROM page 5 (2800H - 2FFFH)
0110 = ROM page 6 (3000H - 37FFH)
0111 = ROM page 7 (3800H - 3FFFH)
1000 = ROM page 8 (4000H - 47FFH)
1001 = ROM page 9 (4800H - 4FFFH)
1010 = ROM page A (5000H - 57FFH)
1011 = ROM page B (5800H - 5FFFH)
1100 = ROM page C (6000H - 67FFH)
1101 = ROM page D (6800H - 6FFFH)
1110 = ROM page E (7000H - 77FFH)
1111 = ROM page F (7800H - 7FFFH)
5.3.2 ROM Addressing Mode
1. Direct Addressing
Bit 14-0 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
PC
A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
2. Far Jump or Call
Bit 14-0 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
PC
P3 P2 P1 P0 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
P0-3 is ROM page register(ROMPR)
Example:
MOV ROMPR,#I
JMP Label_A
or
MOV ROMPR,#I
CALL SUB_A
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