AT89C51RB2 Atmel Corporation, AT89C51RB2 Datasheet - Page 115

• 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

External Data Memory Write
Cycle
4180E–8051–10/06
PORT 0
PORT 2
PSEN
ALE
WR
OR SFR-P2
ADDRESS
Symbol
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
QVWH
WHQX
WLWH
QVWX
WHLH
WHLH
RLRH
RLDV
RHDX
RHDZ
AVDV
AVWL
LLDV
LLWL
LLWL
RLAZ
Type
A0-A7
Max
Max
Max
Max
Max
Max
Max
Min
Min
Min
Min
Min
Min
Min
Min
Min
T
T
LLAX
AVWL
T
LLWL
Standard
Clock
3 T + x
6 T - x
6 T - x
5 T - x
2 T - x
8 T - x
9 T - x
3 T - x
4 T - x
7 T - x
T + x
T - x
T - x
T - x
x
x
ADDRESS A8-A15 OR SFR P2
X2 Clock
T
1.5 T + x
0.5 T + x
2.5 T - x
4.5 T - x
1.5 T - x
0.5 T - x
3.5 T - x
0.5 T - x
0.5 T - x
QVWX
3 T - x
3 T - x
2 T - x
4T -x
T - x
x
x
T
X Parameter for -
QVWH
T
DATA OUT
WLWH
M Range
25
25
30
25
45
65
30
30
30
20
20
15
20
20
0
0
AT89C51RB2/RC2
T
WHLH
X Parameter for -
L Range
25
25
30
25
45
65
30
30
30
20
20
15
20
20
T
0
0
WHQX
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
115