Intel 8XC196NT User Manual page 71

8XC196NT USER'S MANUAL
Hex
Address
FFFFFF
External device (memory or I/O) connected to address/data bus
FFA000
FF9FFF Program memory (Note 1)
FF2080 After a device reset, the first instruction fetch is from FF2080H
(or F2080H in external memory).
FF207F
Special-purpose memory (Note 1)
FF2000
FF1FFF
External device (memory or I/O) connected to address/data bus
FF0600
FF05FF Internal code and data RAM
FF0400 (mapped identically into pages FFH and 00H)
FF03FF
External device (memory or I/O) connected to address/data bus
FF0100
FF00FF
Reserved (Note 2)
FF0000
FEFFFF
Overlaid memory (Note 2)
0F0000
0EFFFF
External device (memory or I/O) connected to address/data bus
010000
00FFFF
External device (memory or I/O) connected to address/data bus
00A000
009FFF External device (memory or I/O) connected to address/data bus
002000 (Note 3)
001FFF
Memory-mapped SFRs
001FE0
001FDF
Peripheral SFRs
001F00
001EFF External device (memory or I/O) connected to address/data bus;
000600 future SFR expansion (Note 4)
0005FF Internal code and data RAM
000400 (mapped identically into page 00H and FF)
0003FF
Upper register file (register RAM)
000100
0000FF
Lower register file (register RAM, stack pointer, CPU SFRs)
000000
NOTES:
1. For the 80C196NT, the program and special-purpose memory locations (FF2000–FF9FFFH) reside in
external memory. For the 87C196NT, these locations can reside either in external memory or in internal
OTPROM.
Locations x F0000– x F00FFH are reserved for in-circuit emulators. Do not use these locations except to
2.
initialize them. Except as otherwise noted, initialize unused program memory locations and reserved
memory locations to FFH.
3. For the 80C196NT, locations 002000–009FFFH reside in external memory. For the 87C196NT, these
locations can be external memory (CCB2.2=0) or a copy of the OTPROM (CCB2.2=1).
4. WARNING: The contents or functions of these locations may change with future device revisions, in
which case a program that relies on one or more of these locations might not function properly.
4-4
Table 4-1. 8XC196NT Memory Map
Description Addressing Modes
Indirect, indexed, extended
Indirect, indexed, extended
Indirect, indexed, extended
Indirect, indexed, extended
Indirect, indexed, extended
Indirect, indexed, extended
—
Indirect, indexed, extended
Indirect, indexed, extended
Indirect, indexed, extended
Indirect, indexed, extended
Indirect, indexed, extended
Indirect, indexed, extended,
windowed direct
Indirect, indexed, extended
Indirect, indexed, extended
Indirect, indexed,
windowed direct
Direct, indirect, indexed