AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 12

• Manufacturer Part Number: AT89C51RE2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RE2

• Flash (kbytes): 128 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Spi: 1
• Uart: 2
• Sram (kbytes): 8.25
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART/OCD
• Watchdog: Yes

Table 14. SFR Mapping
12
C0h
U2(AUXR1.5)
U2(AUXR1.5)
E8h
E0h
D8h
D0h
C8h
B8h
B0h
A8h
A0h
F8h
F0h
98h
90h
88h
80h
AT89C51RE2
=0
=1
addressable
XXXX XX11
00X0 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
1111 1111
1111 1111
X000 000
1111 1111
1111 1111
1111 1111
1111 1111
SCON_1
SCON_0
T2CON
CCON
TCON
PSW
ACC
IEN0
Bit
IPL0
0/8
0/8
P6
P5
P4
P3
P2
P1
P0
B
Table below shows all SFRs with their address and their reset value.
XXXX XXXX
XXXX XX00
00XX X000
XXXX 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
SADDR_0
0000 0000
0000 0000
SADEN_0
0000 0111
SBUF_1
SBUF_0
T2MOD
Reserved
CMOD
FCON
TMOD
IEN1
CH
1/9
CL
SP
1/9
XXXX XXXX
XXXX XXXX
XXXX 0000
0000 0YYY
X000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
SADDR_1
000x 11x0
CCAPM0
CCAP0H
SADEN1
CCAP0L
RCAP2L
BMSEL
AUXR1
BRL_0
IPL1
DPL
TL0
2/A
2/A
XXXX XXXX
XXXX XXXX
BDRCON_0
XXXX 0111
XXX0 0000
X000 0000
0000 0000
0001 0100
0000 0000
0000 0000
0000 0000
0000 0000
xxxx x000
CCAPM1
CCAP1H
RCAP2H
CCAP1L
SPCON
SSCON
BRL_1
FSTA
IPH1
DPH
TL1
3/B
3/B
Non Bit addressable
XXXX XXXX
XXXX XXXX
BDRCON_1
XXX0 0000
X000 0000
0000 0000
0000 0000
0000 0000
0000 0000
1111 1000
CCAPM2
CCAP2H
CCAP2L
SPSCR
SSCS
KBLS
TH0
TL2
4/C
4/C
XXXX XXXX
XXXX XXXX
XXXX XXXX
X000 0000
0000 0000
0000 0000
0000 0000
1111 1111
CCAPM3
CCAP3H
CCAP3L
SPDAT
SSDAT
KBE
TH2
TH1
5/D
5/D
XXXX XXXX
XXXX XXXX
XXXX XXXX
X000 0000
XX00 1000
0000 0000
WDTRST
1111 1110
CCAPM4
CCAP4H
CCAP4L
SSADR
AUXR
KBF
6/E
6/E
XXXX XX00
XXXX X000
X000 0000
00X1 0000
0000 0000
WDTPRG
1111 1111
CKCON1
CKCON0
7663E–8051–10/08
PCON
CKRL
IPH0
7/F
7/F
EFh
DFh
D7h
CFh
C7h
BFh
AFh
FFh
F7h
E7h
B7h
A7h
9Fh
97h
8Fh
87h