參數(shù)資料
型號(hào): ST72T85A5Q6
廠商: 意法半導(dǎo)體
英文描述: 8-BIT MCU FOR RDS WITH 48K ROM, 3K RAM, ADC, TWO TIMERS, TWO SPIs, I2C AND SCI INTERFACES
中文描述: 8位微控制器48,000鐵路發(fā)展策略光盤,3K內(nèi)存,ADC,兩個(gè)定時(shí)器,2個(gè)SPI,I2C和脊髓損傷接口
文件頁數(shù): 16/117頁
文件大小: 748K
代理商: ST72T85A5Q6
16/117
ST7285C
CLOCK SYSTEM
(Cont’d)
3.1.3 Ceramic Resonator
A ceramic resonator may be used as an alterna-
tive to a crystal in low-cost applications. The circuit
shown in Figure 6 is recommended when using a
ceramic resonator. Table 3 lists the recommended
feedback capacitance and resistance values. The
manufacturer of the particular ceramic resonator
being considered should be consulted for specific
information.
Table 2. Recommended Values for Crystal
Resonator
3.1.4 External Clock
An external clock may be applied to the OSCin in-
put with the OSCout pin not connected, as shown
on Figure 4. The t
OXOV
and t
ILCH
specifications do
not apply when using an external clock input. The
equivalent
specification of the external clock
source should be used instead of t
OXOV
or t
ILCH
.
See CONTROL TIMING SECTION.
Table 3.Recommended Values for Ceramic
Resonator
Figure 8. Timing Diagram for Internal CPU Clock Frequency transistions
2MHz
400
5
8
15-40
15-30
10
30
4MHz
75
7
12
15-30
15-25
10
40
8MHz
60
10
15
15-25
15-20
10
60
Unit
pF
fF
pF
pF
M
10
3
R
SMAX
C
0
C
1
C
OSCin
C
OSCout
R
P
Q
2-8MHz
10
40
4.3
30
30
1-10
1250
Unit
pF
pF
pF
pF
M
R
SMAX
C
0
C
1
C
OSCin
C
OSCout
R
P
Q
MISCELLANEOUS REGISTER
00
10
1
1
0
VR02062B
New frequency
requested
New frequency
active when
f
OSC
/4 & f
OSC
/8 = 0
Normal mode
active
Normal mode
requested
PSM1:PSM0
SMS
f
OSC
/2
f
OSC
/4
f
OSC
/8
f
CPU
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