Intel 8XC196NT User Manual page 530

IRAM_CON
The internal RAM control (IRAM_CON) register has two functions related to memory accesses. The
IRAM bit allows you to control access to locations 0400–05FFH. The EA_STAT bit allows you to
determine the status of the EA# pin, which controls access to locations FF2000–FF9FFFH.
7
EA_STAT IRAM
Bit Bit
Number Mnemonic
7 EA_STAT
6 IRAM
5:0 —
— —
EA# Status:
This read-only bit contains the complement of the EA# pin, which
controls whether accesses to locations FF2000–FF9FFFH are directed
to the internal OTPROM or to external memory.
1 = the EA# pin is active (accesses are directed to external memory)
0 = the EA# pin in inactive (accesses are directed to the OTPROM)
("Remapping Internal OTPROM (87C196NT Only)" on page 4-24
describes additional options for OTPROM access.)
Internal RAM Control:
This bit controls whether accesses to locations 0400–05FFH are
directed to internal code RAM or to external memory.
1 = use external memory
0 = use the internal code RAM
Reserved; always write as zeros.
Address:
Reset State:
— —
Function
REGISTERS
IRAM_CON
1FE0H
00H
0
— —
C-35