Intel 80C196NU User Manual

8XC196NP, 80C196NU USER’S MANUAL

5-6

5.2.2.2

Special-purpose Memory

Special-purpose memory resides in locations FF2000–FF207FH. It contains several reserved
memory locations, the chip configuration bytes (CCBs), and vectors for both peripheral transac-
tion server (PTS) and standard interrupts. Note that the special-purpose memory partition of the
80C196NU differs slightly from that of the 8XC196NP. Table 5-3 describes the special-purpose
memory; bold type highlights the differences.

— 80C196NP and 80C196NU: This partition is in external memory (external addresses

F2000–F207FH).

— 83C196NP: The REMAP bit (CCB1.2), the EA# input, and the type of instruction

(extended or nonextended) control access to this partition, as shown in Table 5-4.

Table 5-3. 8XC196NP and 80C196NU Special-purpose Memory Addresses

8XC196NP

Address

(Hex)

80C196NU

Address

(Hex)

Description

FF207F
FF205E

FF207F
FF2060

Reserved (each byte must contain FFH)

FF205D

FF2040

FF205F
FF2040

PTS vectors

FF203F
FF2030

Upper interrupt vectors

FF202F
FF201B

Reserved (each byte must contain FFH)

FF201A

CCB1

FF2019

Reserved (must contain 20H)

FF2018

CCB0

FF2017
FF2014

FF2017
FF2010

Reserved (each byte must contain FFH)

FF2013
FF2000

FF200F
FF2000

Lower interrupt vectors

Table 5-4. Special-purpose Memory Access for the 83C196NP

REMAP

(CCB1.2)

EA# Pin

Instruction

Type

Memory Location Accessed

Asserted

Extended or nonextended

External memory, F2000–F207FH

Deasserted

Extended or nonextended

Internal ROM, FF2000–FF207FH

Deasserted

Extended

Internal ROM, FF2000–FF207FH

Nonextended

External memory, 02000–0207FH