
Common Features Description
Atmel 8051 Microcontrollers Hardware Manual 2-80
4316E–8051–01/07
Reset Value = XXXX XX00b
Table 2-2. AUXR Register
Auxillary Register - AUXR (S:8Eh)
7 6 5 4 3 2 1 0
- - - - - - EXTRAM AO
Bit
Number
Bit
Mnemonic Description
7 -
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6 -
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5 -
Reserved
The value read from this bit is indeterminate. Do not set this bit.
4 -
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3 -
Reserved
The value read from this bit is indeterminate. Do not set this bit.
2 -
Reserved
The value read from this bit is indeterminate. Do not set this bit.
1 EXTRAM
EXTRAM select
Clear to map XRAM data in internal XRAM memory.
Set to map XRAM data in external XRAM memory.
0 AO
ALE Output bit
Clear to restore ALE operation during internal fetches.
Set to disable ALE operation during internal fetches.
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