AT8xC51SND2C
Table 49. SFR Addresses and Reset Values
0/8
1/9
2/A
3/B
4/C
5/D
6/E
7/F
UEPINT
0000 0000
DAT16H
XXXX XXXX
NVERS
F8h
F0h
E8h
E0h
D8h
D0h
C8h
C0h
B8h
B0h
A8h
A0h
98h
90h
88h
80h
FFh
F7h
EFh
E7h
DFh
D7h
CFh
C7h
BFh
B7h
AFh
A7h
9Fh
97h
8Fh
87h
XXXX XXXX(2)
B(1)
0000 0000
PLLCON
0000 1000
USBCLK
0000 0000
MP3CLK
0000 0000
AUDCLK
0000 0000
MMCLK
0000 0000
PLLNDIV
0000 0000
PLLRDIV
0000 0000
ACC(1)
UBYCTLX
0000 0000
MMCON0
0000 0000
MMCON1
0000 0000
MMCON2
0000 0000
MMINT
0000 0011
0000 0000
P5(1)
XXXX 1111
MMDAT
1111 1111
MMCMD
1111 1111
MMSTA
0000 0000
MMMSK
1111 1111
PSW(1)
0000 0000
FCON(3)
UEPCONX
1000 0000
UEPRST
0000 0000
1111 0000(4)
MP3STA(1)
0000 0001
UEPSTAX
0000 0000
UEPDATX
XXXX XXXX
P4(1)
1111 1111
UEPIEN
0000 0000
SPCON
0001 0100
SPSTA
0000 0000
SPDAT
XXXX XXXX
USBADDR
0000 0000
UEPNUM
0000 0000
IPL0(1)
X000 0000
SADEN
0000 0000
UFNUML
0000 0000
UFNUMH
0000 0000
USBCON
0000 0000
USBINT
0000 0000
USBIEN
0001 0000
P3(1)
1111 1111
IEN1
0000 0000
IPL1
0000 0000
IPH1
0000 0000
MP3BAS
0000 0000
MP3MED
0000 0000
MP3TRE
0000 0000
IPH0
X000 0000
IEN0(1)
0000 0000
SADDR
0000 0000
MP3CON
0011 1111
MP3DAT
0000 0000
MP3ANC
0000 0000
MP3STA1
0100 0001
P2(1)
1111 1111
AUXR1
XXXX 00X0
KBCON
0000 1111
KBSTA
0000 0000
WDTRST
XXX XXXX
WDTPRG
XXXX X000
SCON
0000 0000
SBUF
XXXX XXXX
AUDCON0
0000 1000
AUDCON1
1011 0010
AUDSTA
1100 0000
AUDDAT
1111 1111
MP3VOL
0000 0000
MP3VOR
0000 0000
AUXCON(1)
1111 1111
BRL
0000 0000
BDRCON
XXX0 0000
SSCON
0000 0000
SSSTA
1111 1000
SSDAT
1111 1111
SSADR
1111 1110
TCON(1)
TMOD
0000 0000
TL0
0000 0000
TL1
0000 0000
TH0
0000 0000
TH1
0000 0000
AUXR
X000 1101
CKCON
0000 000X(5)
0000 0000
P0(1)
1111 1111
SP
0000 0111
DPL
0000 0000
DPH
0000 0000
PCON
00XX 0000
0/8
1/9
2/A
3/B
4/C
5/D
6/E
7/F
Reserved
Notes: 1. SFR registers with least significant nibble address equal to 0 or 8 are bit-addressable.
2. NVERS reset value depends on the silicon version: 1000 0100 for AT89C51SND2C product and 0000 0001 for AT83SND2C
product.
3. FCON register is only available in AT89C51SND2C product.
4. FCON reset value is 00h in case of reset with hardware condition.
5. CKCON reset value depends on the X2B bit (programmed or unprogrammed) in the Hardware Byte.
35
4341D–MP3–04/05
ATMEL [ ATMEL ]
