Special-Purpose Memory - Intel 8XC196NT User Manual

8XC196NT USER'S MANUAL
Table 4-2. Program Memory Access for the 87C196NT
REMAP
EA#
(CCB2.2)
X asserted
0 deasserted
1 deasserted
We recommend that you write FFH (the opcode for the RST instruction) to
unused program memory locations. This causes a device reset if a program
unintentionally begins to execute in unused memory.
4.2.2.2

Special-purpose Memory

Special-purpose memory resides in locations FF2000–FF207FH (Table 4-4 on page 4-7). It con-
tains several reserved memory locations, the chip configuration bytes (CCBs), and vectors for
both peripheral transaction server (PTS) and standard interrupts.
— 80C196NT: This partition is in external memory (external addresses F2000–F207FH).
— 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 4-3.
Table 4-3. Special-purpose Memory Access for the 87C196NT
REMAP
EA#
(CCB2.2)
X asserted
0 deasserted
1 deasserted
4-6
Instruction Type
extended or
external memory, F2080–F9FFFH
nonextended
extended or
internal OTPROM, FF2080–FF9FFFH
nonextended
extended internal OTPROM, FF2080–FF9FFFH
nonextended internal OTPROM, 002080–009FFFH
NOTE
Instruction
Type
extended or
external memory, F2000–F207FH
nonextended
extended or
internal OTPROM, FF2000–FF207FH
nonextended
extended internal OTPROM, FF2000–FF207FH
nonextended internal OTPROM, 002000–00207FH
Memory Location Accessed
Memory Location Accessed