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8XC196NP, 80C196NU USER’S MANUAL
5-28
83C196NP only: Locations FF2000–FF2FFFH, which store code and special-purpose memory,
are implemented by internal ROM. Data accesses to locations FF2000–FF2FFFH are directed to
the flash memory if EA# is low and to internal ROM if EA# is high. Locations FF2000–FF2FFFH
can be remapped to page 00H by setting the REMAP bit (CCB1.2). An access to the remapped
area, 002000–002FFFH, is directed to ROM if EA# is high and to external memory if EA# is low.
With remapping enabled (REMAP = 1) and EA# high, the far constants in the special-purpose
memory can be accessed as near constants in page 00H.
Table 5-12. Memory Map for the System in Figure 5-9
Address Description
FFFFFFH
FF3000H
External flash memory (code or far constants)
FF2FFFH
FF2080H
Program memory: 80C196NP and 80C196NU: External flash memory
83C196NP: Internal ROM (EA# = 1), external memory (EA# = 0)
FF207FH
FF2000H
Special-purpose memory: 80C196NP and 80C196NU: External flash memory
(far constants) 83C196NP: Internal ROM (EA# = 1), external memory (EA# = 0)
FF1FFFH
FF0100H
External flash memory (code or far constants)
FF00FFH
FF0000H
Reserved
FEFFFFH
010000H
Unimplemented
00FFFFH
008000H
32-Kbyte external RAM (near data)
007FFFH
003000H
Unimplemented
002FFFH
002000H
80C196NP and 80C196NU: Unimplemented
83C196NP: Program and special-purpose memory remapped from internal ROM
(REMAP = 1; EA# = 1)
001FFFH
001F00H
Internal peripheral special-function registers (SFRs)
001EFFH
001C00H
Unimplemented (future SFR expansion)
001BFFH
000400H
Unimplemented
0003FFH
000100H
Upper register file (general-purpose register RAM)
0000FFH
000018H
Lower register file (general-purpose register RAM and stack pointer)
000017H
000000H
Lower register file (CPU SFRs)