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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
FF203F
FF2030
Upper interrupt vectors
FF202F
FF201B
FF202F
FF201B
Reserved (each byte must contain FFH)
FF201A FF201A CCB1
FF2019 FF2019 Reserved (must contain 20H)
FF2018 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
X Asserted Extended or nonextended External memory, F2000–F207FH
0 Deasserted Extended or nonextended Internal ROM, FF2000–FF207FH
1 Deasserted
Extended Internal ROM, FF2000–FF207FH
Nonextended External memory, 02000–0207FH