Rainbow Electronics T89C5121 - 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.