AT89S52-33AC ATMEL Corporation, AT89S52-33AC Datasheet - Page 27

• Manufacturer Part Number: AT89S52-33AC
• Description: 8-bit Microcontroller with 8K Bytes In-System Programmable 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
Note:
Symbol
t
t
t
t
t
XLXL
QVXH
XHQX
XHDX
XHDV
V
CC
1.
- 0.5V
0.45V
INSTRUCTION
WRITE TO SBUF
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.
OUTPUT DATA
INPUT DATA
CLEAR RI
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
CLOCK
ALE
0.2 V
0.2 V
TEST POINTS
CC
CC
+ 0.9V
- 0.1V
0
IH
t
QVXH
min. for a logic 1 and V
CC
= 4.0V to 5.5V and Load Capacitance = 80 pF.
t
1
XHDV
0
VALID
CC
- 0.5V
2
t
XLXL
t
1
XHQX
(1)
VALID
IL
3
t
Min
700
2
XHDX
1.0
50
VALID
0
Float Waveforms
Note:
12 MHz Osc
V
4
LOAD
3
1.
VALID
Max
700
V
V
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
LOAD
LOAD
5
4
VALID
+ 0.1V
- 0.1V
10t
2t
12t
CLCL
CLCL
6
Min
Variable Oscillator
OH
0
CLCL
5
Timing Reference
(1)
VALID
-133
-80
/V
OL
Points
level occurs.
7
6
VALID
10t
SET TI
SET RI
CLCL
Max
8
-133
7
VALID
V
V
OL
OL
- 0.1V
+ 0.1V
Units
ns
ns
ns
ns
s
27