AT89C51RB2 Atmel Corporation, AT89C51RB2 Datasheet - Page 8

• Manufacturer Part Number: AT89C51RB2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RB2

• Flash (kbytes): 16 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Sram (kbytes): 1.25
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

Table 11 shows all SFRs with their address and their reset value.
Table 11. SFR Mapping
1.
Reserved
8
D8h
D0h
C8h
C0h
F8h
F0h
E8h
E0h
B8h
B0h
A8h
A0h
98h
90h
88h
80h
FCON access is reserved for the Flash API and ISP software.
addressable
00X0 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
X000 000
1111 1111
1111 1111
1111 1111
1111 1111
AT89C51RB2/RC2
T2CON
CCON
SCON
TCON
PSW
IEN0
ACC
Bit
IPL0
0/8
0/8
P3
P2
P1
P0
B
XXXX XXXX
XXXX XX00
XXXXX 000
00XX X000
XXXX 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0111
FCON
T2MOD
SADEN
SADDR
CMOD
TMOD
SBUF
IEN1
1/9
CH
1/9
CL
SP
(1)
XXXX XXXX
XXXXX0X0
XXXXX000
X000 0000
0000 0000
0000 0000
0000 0000
0000 0000
CCAPM0
CCAP0H
CCAP0L
RCAP2L
AUXR1
XXXX
IPL1
BRL
DPL
TL0
2/A
2/A
XXXX XXXX
XXXX X000
XXX0 0000
X000 0000
0000 0000
0001 0100
0000 0000
0000 0000
BDRCON
CCAPM1
CCAP1H
RCAP2H
CCAP1L
SPCON
XXXX
IPH1
DPH
TL1
3/B
3/B
Non Bit addressable
XXXX XXXX
X000 0000
0000 0000
0000 0000
0000 0000
0000 0000
CCAPL2H
CCAPL2L
CCAPM2
SPSTA
XXXX
KBLS
TH0
TL2
4/C
4/C
XXXX XXXX
XXXX XXXX
X000 0000
0000 0000
0000 0000
0000 0000
CCAPL3H
CCAPL3L
CCAPM3
SPDAT
XXXX
TH2
KBE
TH1
5/D
5/D
XXXX XXXX
XXXX XXXX
XX0X 0000
X000 0000
0000 0000
CCAPL4H
CCAPL4L
WDTRST
CCAPM4
AUXR
XXXX
KBF
6/E
6/E
XXXX XXX0
XXXX X000
X000 0000
00X1 0000
0000 0000
WDTPRG
1111 1111
CKCON1
CKCON0
PCON
CKRL
IPH0
7/F
7/F
4180E–8051–10/06
DFh
CFh
FFh
F7h
EFh
E7h
D7h
C7h
BFh
B7h
AFh
A7h
9Fh
8Fh
97h
87h