W79E825A Datasheet, PDF (13/127 Pages) Winbond – 8-BIT MICROCONTROLLER

W79E825A/824A/823B/822B Data Sheet
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Code M em ory
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FC00H
128 Bytes
NVM
Data M em ory
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Code M em ory
Page 1
64 bytes
Page 0
64 bytes
FC7FH
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NVM Data M em ory area
1 0 0 0 H /0 8 0 0 H
0 F F F H /0 7 F F H
0000H
4K/2K Bytes
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Code M em ory
C O N FIG 2
C O N FIG 1
O n-C hip C ode M em ory S pace
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