AT83C51SND1C_03 ATMEL [ATMEL Corporation], AT83C51SND1C_03 Datasheet - Page 29

• Manufacturer Part Number: AT83C51SND1C_03
• Description: Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
• Manufacturer: ATMEL [ATMEL Corporation]

4109E–8051–06/03
Table 29. AUXR Register
AUXR (S:8Eh) – Auxiliary Control Register
Reset Value = X000 1101b
Number
3 - 2
Bit
7
-
7
6
5
4
1
0
Mnemonic Description
EXTRAM
DPHDIS
XRS1:0
EXT16
EXT16
Bit
M0
AO
6
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
External 16-bit Access Enable Bit
Set to enable 16-bit access mode during MOVX instructions.
Clear to disable 16-bit access mode and enable standard 8-bit access mode
during MOVX instructions.
External Memory Access Stretch Bit
Set to stretch RD or WR signals duration to 15 CPU clock periods.
Clear not to stretch RD or WR signals and set duration to 3 CPU clock periods.
DPH Disable Bit
Set to disable DPH output on P2 when executing MOVX @DPTR instruction.
Clear to enable DPH output on P2 when executing MOVX @DPTR instruction.
Expanded RAM Size Bits
Refer to Table 26 for ERAM size description.
External RAM Enable Bit
Set to select the external XRAM when executing MOVX @Ri or MOVX @DPTR
instructions.
Clear to select the internal expanded RAM when executing MOVX @Ri or MOVX
@DPTR instructions.
ALE Output Enable Bit
Set to output the ALE signal only during MOVX instructions.
Clear to output the ALE signal at a constant rate of F
M0
5
DPHDIS
4
XRS1
3
AT8xC51SND1C
XRS0
2
CPU
/3.
EXTRAM
1
AO
0
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