AT89C51RD2 Atmel Corporation, AT89C51RD2 Datasheet - Page 123

• 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

25.3.8
25.3.9
25.3.10
4235K–8051–05/08
Shift Register Timing Waveforms
External Clock Drive Waveforms
AC Testing Input/Output Waveforms
INSTRUCTION
ALE
CLOCK
OUTPUT DATA
WRITE to SBUF
INPUT DATA
CLEAR RI
Table 25-9.
AC inputs during testing are driven at V
measurement are made at V
T
QVXH
0
INPUT/OUTPUT
0.45V
T
XHDV
Symbol
V
T
T
T
T
T
CC
QVHX
XHQX
XHDX
XHDV
XLXL
1
-0.5V
0
AC Parameters for a Variable Clock
VALID
T
XLXL
T
XHQX
2
1
Type
0.2V
Max
Min
Min
Min
Min
VALID
0.7V
CC
IH
CC
-0.1
T
V
CHCL
T
CC
min for a logic “1” and V
3
XHDX
2
0.45V
-0.5V
VALID
Standard
10 T - x
10 T - x
2 T - x
Clock
12 T
x
4
CC
3
VALID
- 0.5 for a logic “1” and 0.45V for a logic “0”. Timing
X2 Clock
T
CLCX
5 T - x
5 T- x
T - x
6 T
5
4
x
VALID
IL
0.2 V
0.2 V
max for a logic “0”.
T
6
5
CLCL
CC
CC
VALID
X Parameter For
AT89C51RD2/ED2
+ 0.9
- 0.1
-M Range
T
CLCH
133
50
20
T
0
7
6
CHCX
VALID
SET TI
SET RI
8
7
VALID
Units
ns
ns
ns
ns
ns
123