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ST72344S2 Datasheet(PDF) 209 Page - STMicroelectronics

Part # ST72344S2
Description  SCI asynchronous serial interface
PDF  247 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72344S2 Datasheet(HTML) 209 Page - STMicroelectronics

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ST72344xx, ST2345xx
Electrical characteristics
Doc ID 12321 Rev 6
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13.6
Clock and timing characteristics
Subject to general operating conditions for VDD, fOSC, and TA.
Figure 96.
Typical application with an external clock source
Table 95.
General timings
Symbol
Parameter (1)
1.
Guaranteed by Design. Not tested in production.
Conditions
Min
Typ (2)
2.
Data based on typical application software.
Max
Unit
tc(INST)
Instruction cycle time
fCPU=8 MHz
23
12
tCPU
250
375
1500
ns
tv(IT)
Interrupt reaction time (3)
tv(IT) = Δtc(INST) + 10
3.
Time measured between interrupt event and interrupt vector fetch. Dtc(INST) is the number of tCPU cycles
needed to finish the current instruction execution.
fCPU=8 MHz
10
22
tCPU
1.25
2.75
µs
Table 96.
External clock source
Symbol
Parameter
Conditions
Min
Max
Unit
VOSC1H
OSC1 input pin high level voltage
see Figure 96
0.7xVDD
VDD
V
VOSC1L
OSC1 input pin low level voltage
VSS
0.3xVDD
tw(OSC1H)
tw(OSC1L)
OSC1 high or low time (1)
1.
Data based on design simulation and/or technology characteristics, not tested in production.
15
ns
tr(OSC1)
tf(OSC1)
OSC1 rise or fall time (1)
15
IL
OSCx Input leakage current
VSS ≤ VIN ≤ VDD
±1
µA
OSC1
OSC2
fOSC
EXTERNAL
ST72XXX
CLOCK SOURCE
Not connected internally
VOSC1L
VOSC1H
tr(OSC1)
tf(OSC1)
tw(OSC1H)
tw(OSC1L)
IL
90%
10%



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