External Memory; Program And Special-Purpose Memory; Program Memory In - Intel 8XC196NT User Manual

4.2.1

External Memory

Several partitions in pages 00H and FFH and all of pages 01H–0EH are assigned to external
memory (see Table 4-1 on page 4-4). Data can be stored in any part of this memory. Instructions
can be stored in any part of this memory in 1-Mbyte mode, but can be stored only in page FFH
in 64-Kbyte mode. "Memory Configuration Examples" on page 4-28 contains examples of mem-
ory configurations in the two modes. Chapter 14, "Interfacing with External Memory," describes
the external memory interface and shows additional examples of external memory configura-
tions.
4.2.2

Program and Special-purpose Memory

Program memory and special-purpose memory occupy a 32-Kbyte memory partition in the ad-
dress range FF2000–FF9FFFH. For the 80C196NT, this partition resides in external memory (ex-
ternal addresses F2000–F9FFFH). For the 87C196NT, this partition can reside either in external
memory (external addresses F2000–F9FFFH) or in the internal OTPROM. If the partition resides
in OTPROM, it can be mapped into both pages 00H and FFH or into page FFH only (see "Remap-
ping Internal OTPROM (87C196NT Only)" on page 4-23).
4.2.2.1 Program Memory in Page FFH
Four partitions in page FFH can be used for program memory:
•
FF0100–FF03FFH in external memory (external addresses F0100–F03FFH)
•
FF0400–FF05FFH in internal RAM (internal addresses FF0400–FF05FFH)
•
FF0600–FF1FFFH in external memory (external addresses F0600–F1FFFH)
•
FF2080–FF9FFFH
— 80C196NT: This partition is in external memory (external addresses F2080–F9FFFH).
— 87C196NT: The REMAP bit (CCB2.2), the EA# input, and the type of instruction
(extended or nonextended) control access to this partition, as shown in Table 4-2.
MEMORY PARTITIONS
4-5