at89s53-33pc ATMEL Corporation, at89s53-33pc Datasheet - Page 29

• Manufacturer Part Number: at89s53-33pc
• Description: At89s53, In-system Programmable Microcontroller With 12k Bytes Flash. For New Designs Use At89s8253.
• 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:
0787E–MICRO–3/06
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
IH
min. for a logic 1 and V
CC
= 4.0V to 6V and Load Capacitance = 80 pF
CC
- 0.5V
IL
700
Min
1.0
50
(1)
max.
0
12 MHz Oscillator
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
OH
Min
Variable Oscillator
0
CLCL
/V
- 117
(1)
- 133
OL
level occurs.
10t
CLCL
Max
AT89S53
- 133
Units
µs
ns
ns
ns
ns
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