参数资料
型号: ST72C254G2M7
英文描述: 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY. ADC. 16-BIT TIMERS. SPI.
中文描述: 8位单电压闪存微控制器。 ADC的。 16位定时器。的SPI。
文件页数: 8/140页
文件大小: 1349K
代理商: ST72C254G2M7
ST72104G, ST72215G, ST72216G, ST72254G
105/140
14.5 CLOCK AND TIMING CHARACTERISTICS
Subject to general operating conditions for VDD, fOSC, and TA.
14.5.1 General Timings
14.5.2 External Clock Source
Figure 63. 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
2
3
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
s
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VOSC1H
OSC1 input pin high level voltage
see Figure 63
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
IL
OSCx Input leakage current
VSS≤VIN≤VDD
±1
A
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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