AT89C51RB2 Atmel Corporation, AT89C51RB2 Datasheet - Page 116

• 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 Read Cycle
Serial Port Timing - Shift
Register Mode
116
AT89C51RB2/RC2
PORT 0
PORT 2
ALE
PSEN
RD
OR SFR-P2
ADDRESS
Table 80. Symbol Description
Table 81. AC Parameters for a Fix Clock
Table 82. AC Parameters for a Variable Clock
Symbol
Symbol
T
T
T
T
T
T
T
T
T
T
QVHX
XHQX
XHDX
XHDV
QVHX
XHQX
XHDX
XHDV
XLXL
XLXL
Symbol
T
T
T
T
T
QVHX
XHQX
XHDX
XHDV
XLXL
A0-A7
Type
Max
Min
Min
Min
Min
T
LLAX
T
AVWL
T
LLWL
Parameter
Serial port clock cycle time
Output data set-up to clock rising edge
Output data hold after clock rising edge
Input data hold after clock rising edge
Clock rising edge to input data valid
Standard
10 T - x
10 T - x
Clock
2 T - x
T
12 T
AVDV
x
T
Min
LLDV
300
200
30
0
ADDRESS A8-A15 OR SFR P2
X2 Clock
-M
T
5 T - x
5 T- x
RLAZ
T - x
6 T
x
X Parameter for -
T
M Range
RLRH
133
Max
50
20
117
0
DATA IN
T
Min
T
300
200
WHLH
30
RHDX
X Parameter for -L
0
Range
133
50
20
T
0
RHDZ
-L
Max
117
4180E–8051–10/06
Units
ns
ns
ns
ns
ns
Units
ns
ns
ns
ns
ns