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| ST6215C_09 Datasheet, PDF (73/105 Pages) STMicroelectronics – 8-bit MCUs with A/D converter, two timers, oscillator safeguard & safe reset | |||
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ST6215C ST6225C
11.5 CLOCK AND TIMING CHARACTERISTICS
Subject to general operating conditions for VDD, fOSC, and TA.
11.5.1 General Timings
Symbol
Parameter
Conditions
tc(INST)
tv(IT)
Instruction cycle time
Interrupt reaction time 2)
tv(IT) = Îtc(INST) + 6
fCPU=8 MHz
fCPU=8 MHz
Min
2
3.25
6
9.75
Typ 1)
4
6.5
Max
5
8.125
11
17.875
Unit
tCPU
μs
tCPU
μs
11.5.2 External Clock Source
Symbol
VOSCINH
VOSCINL
IL
Parameter
OSCIN input pin high level voltage
OSCIN input pin low level voltage
OSCx Input leakage current
Conditions
See Figure 49
VSSâ¤VINâ¤VDD
Min
Typ
0.7xVDD
VSS
Max
VDD
0.3xVDD
±2
Unit
V
μA
Notes:
1. Data based on typical application software.
2. Time measured between interrupt event and interrupt vector fetch. Îtc(INST) is the number of tCPU cycles needed to finish
the current instruction execution.
Figure 49. Typical Application with an External Clock Source
VOSCINH
VOSCINL
90%
10%
Not connected
OSCOUT
EXTERNAL
CLOCK SOURCE
OSCIN
fOSC
IL
ST62XX
73/105
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