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ST72311R Datasheet(PDF) 138 Page - STMicroelectronics

Part # ST72311R
Description  8-BIT MCU WITH NESTED INTERRUPTS, EEPROM, ADC, 16-BIT TIMERS, 8-BIT PWM ART, SPI, SCI, CAN INTERFACES
PDF  164 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72311R Datasheet(HTML) 138 Page - STMicroelectronics

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ST72311R, ST72511R, ST72512R, ST72532R
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12.5 CLOCK AND TIMING CHARACTERISTICS
Subject to general operating condition for VDD,fOSC, and TA.
12.5.1 General Timings
12.5.2 External Clock Source
Figure 73. Typical Application with an External Clock Source
12.5.3 Crystal and Ceramic Resonator Oscillators
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.
4. CL1 (resp.CL2) is load capacitance on OSC1 (resp. OSC2) pin.
5. RS is the equivalent serial resistance of the crystal or ceramic resonator.
Symbol
Parameter
Conditi ons
Min
Typ 1)
Max
Unit
tc(INST)
Instruction cycle time
2
4
12
tCPU
fCPU=8MHz
250
500
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
Condi tions
Min
Typ
Max
Unit
VOSC1H
OSC1 input pin high level voltage
see Figure 73
0.7xVDD
VDD
V
VOSC1L
OSC1 input pin low level voltage
VSS
0.3xVDD
tw(OSC1H)
tw(OSC1L)
OSC1 high or low time 3)
15
ns
tr(OSC1)
tf(OSC1)
OSC1 rise or fall time 3)
15
ROBP
Oscillator bypass exteranl resistor
1
k
Ω
Symbol
Parameter
Conditio ns
Min
Max
Unit
fOSC
Oscillator Frequency
4
16
MHz
CL1,CL2
Load capacitance 4)
RS=100Ω
5)
12
21
pF
tSTART
Oscillator start-up time
Depends on resonator quality. A typical value is 10ms
VOSC1L
VOSC1H
tr(OSC1)
tf(OSC1)
tw(OSC1H)
tw(OSC1L)
90%
10%



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