AT89LP51RD2 Atmel Corporation, AT89LP51RD2 Datasheet - Page 235

• Manufacturer Part Number: AT89LP51RD2
• Manufacturer: Atmel Corporation

Specifications of AT89LP51RD2

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-1C
• Max I/o Pins: 42
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Adc Channels: 7
• Adc Resolution (bits): 10
• Adc Speed (ksps): 153.8
• Sram (kbytes): 2.25
• Self Program Memory: API
• Operating Voltage (vcc): 2.4 to 5.5
• Timers: 4
• Isp: SPI/OCD/UART
• Watchdog: Yes

Figure 25-14. Two-wire Serial Bus Timing
25.9
The values in this table are valid for V
Figure 25-15. Shift Register Mode Timing Waveform
3714A–MICRO–7/11
SCL
SDA
Symbol
t
t
t
t
t
XLXL
QVXH
XHQX
XHDX
XHDV
3. C
4. f
Serial Port Timing: Shift Register Mode
t
SU;STA
Write to SBUF
Write to SBUF
Output Data
Output Data
CK
Input Data
Input Data
Parameter
Serial Port Clock Cycle Time
Output Data Setup to Clock Rising Edge
Output Data Hold after Clock Rising Edge
Input Data Hold after Clock Rising Edge
Input Data Valid to Clock Rising Edge
b
Clear RI
Clear RI
= capacitance of one bus line in pF.
= CPU clock frequency
Clock
Clock
t
HD;STA
0
Valid
Valid
t
t
of
LOW
0
DD
= 2.4V to 5.5V and Load Capacitance = 80 pF.
1
Valid
Valid
1
t
HIGH
t
HD;DAT
2
Valid
Valid
AT89LP51RD2/ED2/ID2 Preliminary
2
4t
3t
t
CLCL
CLCL
CLCL
Min
15
0
t
LOW
-15
3
-15
Valid
Valid
-15
SMOD1 = 0
SMOD1 = 0
SMOD1 = 1
3
t
SU;DAT
4
Valid
Valid
Max
4
5
Valid
Valid
2t
5
t
t
CLCL
CLCL
CLCL
Min
15
0
-15
-15
-15
SMOD1 = 1
6
Valid
Valid
6
t
SU;STO
Max
7
t
r
Valid
Valid
7
Units
µs
ns
ns
ns
ns
t
BUF
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