AT89C51RB2 Atmel Corporation, AT89C51RB2 Datasheet - Page 5

• 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 2. C51 Core SFRs
Table 3. System Management SFRs
Table 4. Interrupt SFRs
Table 5. Port SFRs
4180E–8051–10/06
Mnemonic
Mnemonic
Mnemonic
Mnemonic
CKCKON0
CKCKON1
AUXR1
PCON
AUXR
CKRL
PSW
IEN0
IEN1
IPH0
IPH1
ACC
DPH
IPL0
IPL1
DPL
SP
P0
P1
P2
P3
B
Add
Add
Add
Add
D0h
E0h
F0h
81h
82h
83h
8Eh
A2h
AFh
A8h
B1h
B7h
B8h
B3h
B2h
80h
90h
A0h
B0h
87h
97h
8Fh
Name
Accumulator
B Register
Program Status Word
Stack Pointer
Data Pointer Low Byte
Data Pointer High Byte
Name
Interrupt Enable Control 0
Interrupt Enable Control 1
Interrupt Priority Control High 0
Interrupt Priority Control Low 0
Interrupt Priority Control High 1
Interrupt Priority Control Low 1
Name
8-bit Port 0
8-bit Port 1
8-bit Port 2
8-bit Port 3
Name
Power Control
Auxiliary Register 0
Auxiliary Register 1
Clock Reload Register
Clock Control Register 0
Clock Control Register 1
SMOD1
CKRL7
DPU
7
-
-
-
CY
EA
7
7
7
-
-
-
-
-
SMOD0
WDTX2
CKRL6
6
-
-
-
PPCH
PPCL
AC
EC
6
6
6
-
-
-
ENBOOT
CKRL5
PCAX2
M0
5
-
-
PT2H
PT2L
ET2
F0
5
5
5
-
-
-
CKRL4
XRS2
SIX2
POF
4
-
-
RS1
PHS
PLS
ES
4
4
4
-
-
-
CKRL3
XRS1
T2X2
GF1
GF3
3
-
AT89C51RB2/RC2
PT1H
PT1L
RS0
ET1
3
3
3
-
-
-
CKRL2
XRS0
T1X2
GF0
2
0
PX1H
-
PX1L
ESPI
SPIH
SPIL
EX1
OV
2
2
2
EXTRAM
CKRL1
T0X2
IE2CH
IE2CL
PD
PT0H
PT0L
1
EI2C
ET0
-
-
F1
1
1
1
CKRL0
SPIX2
KBDH
PX0H
KBDL
DPS
PX0L
IDL
KBD
AO
EX0
X2
0
0
0
0
P
5