AT89S8252-24QC ATMEL [ATMEL Corporation], AT89S8252-24QC Datasheet - Page 30

• Manufacturer Part Number: AT89S8252-24QC
• Description: 8-bit Microcontroller with 8K Bytes Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Serial Port Timing: Shift Register Mode Test Conditions
The values in this table are valid for V
Shift Register Mode Timing Waveforms
AC Testing Input/Output Waveforms
Notes:
30
Symbol
t
t
t
t
t
XLXL
QVXH
XHQX
XHDX
XHDV
1. AC Inputs during testing are driven at V
for a logic 1 and 0.45V for a logic 0. Timing measure-
ments are made at V
for a logic 0.
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
Clock Rising Edge to Input Data Valid
AT89S8252
IH
min. for a logic 1 and V
CC
= 4.0V to 6V and Load Capacitance = 80 pF.
CC
- 0.5V
IL
(1)
max.
Float Waveforms
Notes:
1. For timing purposes, a port pin is no longer floating
when a 100 mV change from load voltage occurs. A
port pin begins to float when a 100 mV change from
the loaded V
10t
2t
CLCL
12t
CLCL
OH
Min
Variable Oscillator
0
CLCL
/V
- 117
(1)
- 133
OL
level occurs.
10t
CLCL
Max
- 133
Units
µs
ns
ns
ns
ns