AT89C51RD2 Atmel Corporation, AT89C51RD2 Datasheet - Page 4

• Manufacturer Part Number: AT89C51RD2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RD2

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Sram (kbytes): 2
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

3. SFR Mapping
Table 3-1.
Table 3-2.
4
Mnemonic
ACC
B
PSW
SP
DPL
DPH
Mnemonic
PCON
AUXR
AUXR1
CKRL
CKCKON0
CKCKON1
AT89C51RD2/ED2
Add
D0h
Add
AFh
E0h
F0h
81h
82h
83h
87h
8Eh
A2h
97h
8Fh
C51 Core SFRs
System Management SFRs
Name
Accumulator
B Register
Program Status Word
Stack Pointer
Data Pointer Low Byte
Data Pointer High Byte
Name
Power Control
Auxiliary Register 0
Auxiliary Register 1
Clock Reload Register
Clock Control Register 0
Clock Control Register 1
The Special Function Registers (SFRs) of the AT89C51RD2/ED2 fall into the following
categories:
• C51 core registers: ACC, B, DPH, DPL, PSW, SP
• I/O port registers: P0, P1, P2, P3, PI2
• Timer registers: T2CON, T2MOD, TCON, TH0, TH1, TH2, TMOD, TL0, TL1, TL2, RCAP2L,
• Serial I/O port registers: SADDR, SADEN, SBUF, SCON
• PCA (Programmable Counter Array) registers: CCON, CCAPMx, CL, CH, CCAPxH, CCAPxL
• Power and clock control registers: PCON
• Hardware Watchdog Timer registers: WDTRST, WDTPRG
• Interrupt system registers: IE0, IPL0, IPH0, IE1, IPL1, IPH1
• Keyboard Interface registers: KBE, KBF, KBLS
• SPI registers: SPCON, SPSTR, SPDAT
• BRG (Baud Rate Generator) registers: BRL, BDRCON
• Clock Prescaler register: CKRL
• Others: AUXR, AUXR1, CKCON0, CKCON1
RCAP2H
(x: 0 to 4)
SMOD1
DPU
CY
7
7
-
-
-
-
SMOD0
WDTX2
AC
6
6
-
-
-
-
ENBOOT
PCAX2
M0
F0
5
5
-
-
-
XRS2
SIX2
RS1
POF
4
4
-
-
-
XRS1
T2X2
RS0
GF1
GF3
3
3
-
-
XRS0
T1X2
GF0
OV
2
2
0
-
-
EXTRAM
T0X2
PD
F1
1
1
-
-
-
4235K–8051–05/08
SPIX2
DPS
IDL
AO
X2
P
0
0
-