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ST72321 Datasheet(PDF) 147 Page - STMicroelectronics

Part # ST72321
Description  64/44-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC,FIVE TIMERS, SPI, SCI, I2C INTERFACE
PDF  189 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72321 Datasheet(HTML) 147 Page - STMicroelectronics

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ST72321
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12.5 CLOCK AND TIMING CHARACTERISTICS
Subject to general operating conditions for VDD, fCPU, and TA.
12.5.1 General Timings
12.5.2 External Clock Source
Figure 77. Typical Application with an External Clock Source
Notes:
1. Data based on typical application software.
2. Time measured between interrupt event and interrupt vector fetch.
∆t
c(INST) is the number of tCPU cycles needed to finish
the current instruction execution.
3. Data based on design simulation and/or technology characteristics, not tested in production.
Symbol
Parameter
Conditions
Min
Typ 1)
Max
Unit
tc(INST)
Instruction cycle time
23
12
tCPU
fCPU=8MHz
250
375
1500
ns
tv(IT)
Interrupt reaction time 2)
tv(IT) = ∆tc(INST) + 10
10
22
tCPU
fCPU=8MHz
1.25
2.75
µs
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VOSC1H
OSC1 input pin high level voltage
see Figure 77
VDD-1
VDD
V
VOSC1L
OSC1 input pin low level voltage
VSS
VSS+1
tw(OSC1H)
tw(OSC1L)
OSC1 high or low time 3)
5
ns
tr(OSC1)
tf(OSC1)
OSC1 rise or fall time 3)
15
IL
OSC1 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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