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8XC196NP, 80C196NU USER’S MANUAL
5-10
Figure 5-3. Register File Memory Map
Table 5-6 on page 5-11 lists the register file memory addresses. The RALU accesses the lower
register file directly, without the use of the memory controller. It also accesses a windowed loca-
tion directly (see “Windowing” on page 5-13). Only the upper register file and the peripheral
SFRs can be windowed. Registers in the lower register file and registers being windowed can be
accessed with direct addressing.
NOTE
The register file must not contain code. An attempt to execute an instruction
from a location in the register file causes the memory controller to fetch the
instruction from external memory.
Upper
Register File
Lower
Register File
03FFH
0100H
00FFH
0000H
Address
A0301-02
0100H
00FFH
001AH
0019H
0018H
0017H
0000H
General-purpose
Register RAM
Stack Pointer
General-purpose
Register RAM
0100H
00FFH
001AH
0019H
0018H
0017H
0000H
CPU SFRs
03FFH
Address
Page 00H