AT89LS53 ATMEL Corporation, AT89LS53 Datasheet - Page 29

• Manufacturer Part Number: AT89LS53
• Description: 8-Bit Microcontroller with 12K Bytes Flash
• Manufacturer: 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:
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 mea-
surements are made at V
max. 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
IH
min. for a logic 1 and V
CC
= 2.7V to 6V and Load Capacitance = 80 pF.
CC
- 0.5V
Min
700
1.0
50
12 MHz Oscillator
0
(1)
IL
Float Waveforms
Notes:
Max
700
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
Min
Variable Oscillator
OH
CLCL
0
- 117
/V
(1)
- 133
OL
level occurs.
10t
CLCL
Max
- 133
Units
ns
ns
ns
ns
4-277
s