AT89S2051 Atmel Corporation, AT89S2051 Datasheet - Page 38

• Manufacturer Part Number: AT89S2051
• Manufacturer: Atmel Corporation

Specifications of AT89S2051

• Flash (kbytes): 2 Kbytes
• Max. Operating Frequency: 24 MHz
• Cpu: 8051-12C
• Max I/o Pins: 15
• Uart: 1
• Sram (kbytes): 0.25
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 2
• Isp: SPI

44. Serial Port Timing: Shift Register Mode Test Conditions
The values in this table are valid for V
45. Shift Register Mode Timing Waveforms
46. AC Testing Input/Output Waveforms
47. Float Waveforms
38
Symbol
t
t
t
t
t
XLXL
QVXH
XHQX
XHDX
XHDV
AT89S2051/S4051
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
Note:
Note:
(1)
1. AC Inputs during testing are driven at V
1. For timing purposes, a port pin is no longer floating when a 100 mV change from load voltage
CC
measurements are made at V
occurs. A port pin begins to float when 100 mV change from the loaded V
= 2.7V to 5.5V and Load Capacitance = 80 pF.
(1)
IH
min. for a logic 1 and V
CC
- 0.5V for a logic 1 and 0.45V for a logic 0. Timing
10t
12t
2t
CLCL
CLCL
CLCL
t
Min
CLCL
IL
0
max. for a logic 0.
-15
-15
-15
Variable
Max
OH
/V
3390E–MICRO–6/08
OL
level occurs.
Units
µs
ns
ns
ns
ns