W79E825A/824A/823B/822B Data Sheet
FFFFH
Unused
Code M em ory
FC7FH
Page 1
FC 7FH
FC00H
128 Bytes
NVM
Data M em ory
64 bytes
FC40H
FC3FH
Page 0
64 bytes
FC00H
NVM Data M em ory area
Unused
Code M em ory
1000H/0800H
0FFFH/07FFH
4K/2K Bytes
O n-Chip
Code M em ory
CO N FIG 2
CO N FIG 1
0000H
O n-Chip Code M em ory Space
Figure 7-2: W79E823/822 Memory Map
7.3 Register Map
As mentioned before the W79E825 series have separate Program and Data Memory areas. The on-
chip 256/128 bytes scratch pad RAM is in addition to the external memory. There are also several
Special Function Registers (SFRs) which can be accessed by software. The SFRs can be accessed
only by direct addressing, while the on-chip RAM can be accessed by either direct or indirect
addressing.
Publication Release Date: February 21, 2008
- 13 -
Revision A9
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