Datasheet

4341H–MP3–10/07

AT8xC51SND2C/MP3B

Reset Value = X000 1101b

1 EXTRAM

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.

0 AO

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

CPU

/3.

Bit Number

Bit

Mnemonic Description