W79E825A/824A/823B/822B Data Sheet
FFFFH
U nused
C o d e M e m o ry
FC 7FH
FC 40H
FC 3FH
FC 00H
FC 7FH
FC00H
1 2 8 B y te s
NVM
D a ta M e m o ry
Page 1
6 4 b y te s
Page 0
6 4 b y te s
U nused
C o d e M e m o ry
N V M D a ta M e m o ry a re a
1 0 0 0 H /0 8 0 0 H
0 F F F H /0 7 F F H
4 K /2 K B y te s
O n -C h ip
C o d e M e m o ry
0000H
C O N F IG 2
C O N F IG 1
O n -C h ip C o d e M e m o ry S p a c e
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.
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Publication Release Date: February 21, 2008
Revision A9
WINBOND [ WINBOND ]
