AT89LP51 Atmel Corporation, AT89LP51 Datasheet - Page 104

• Manufacturer Part Number: AT89LP51
• Manufacturer: Atmel Corporation

Specifications of AT89LP51

• Flash (kbytes): 4 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-1C
• Max I/o Pins: 36
• Uart: 1
• Sram (kbytes): 0.25
• Eeprom (bytes): 256
• Self Program Memory: IAP
• Operating Voltage (vcc): 2.4 to 5.5
• Timers: 3
• Isp: SPI
• Watchdog: Yes

18.7
The values in this table are valid for V
Figure 18-17. Shift Register Mode Timing Waveform
18.8
18.8.1
Note:
104
Symbol
t
t
t
t
t
XLXL
QVXH
XHQX
XHDX
XHDV
Serial Port Timing: Shift Register Mode
Test Conditions
1. AC Inputs during testing are driven at V
AT89LP51/52
AC Testing Input/Output Waveform
Write to SBUF
Write to SBUF
V
Output Data
Output Data
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
IH
Clear RI
Clear RI
min. for a logic “1” and V
Clock
Clock
0
Valid
Valid
0
IL
DD
max. for a logic “0”.
= 2.4V to 5.5V and Load Capacitance = 80 pF.
1
Valid
Valid
1
DD
(1)
- 0.5V for a logic “1” and 0.45V for a logic “0”. Timing measurements are made at
2
Valid
Valid
2
3t
4t
t
CLCL
CLCL
CLCL
Min
15
0
-15
3
Valid
Valid
-15
-15
SMOD1 = 0
SMOD1 = 0
SMOD1 = 1
3
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
Max
7
Valid
Valid
3709D–MICRO–12/11
7
Units
µs
ns
ns
ns
ns