Rainbow Electronics T89C5121 User Manual
Page 19
19
A/T8xC5121
4164G–SCR–07/06
Table 4. AUXR Register
AUXR (S:8Eh)
Auxiliary Register
Reset Value = 00XX XX00b
7
6
5
4
3
2
1
0
-
LP
-
-
-
-
EXTRAM
AO
Bit
Number
Bit
Mnemonic
Description
7
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6
LP
Low Power mode selection
Clear to select standard mode
Set to select low consumption mode
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
(ONLY for PLCC52 version)
Clear to map XRAM datas in internal XRAM memory.
Set to map XRAM datas in external XRAM memory.
0
AO
ALE Output bit
(ONLY for PLCC52 version)
Clear to restore ALE operation during internal fetches.
Set to disable ALE operation during internal fetches.