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ST7285C Datasheet(HTML) 16 Page - STMicroelectronics

Part No. ST7285C
Description  8-BIT MCU FOR RDS WITH 48K ROM, 3K RAM, ADC, TWO TIMERS, TWO SPIs, I2C AND SCI INTERFACES
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST7285C Datasheet(HTML) 16 Page - STMicroelectronics

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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 tOXOV and tILCH specifications do
not apply when using an external clock input. The
equivalent specification of the external clock
source should be used instead of tOXOV or tILCH.
See CONTROL TIMING SECTION.
Table 3.Recommended Values for Ceramic
Resonator
Figure 8. Timing Diagram for Internal CPU Clock Frequency transistions
2MHz
4MHz
8MHz
Unit
RSMAX
400
75
60
C0
5
7
10
pF
C1
812
15
fF
COSCin
15-40
15-30
15-25
pF
COSCout
15-30
15-25
15-20
pF
RP
10
10
10
M
Q
304060
103
2-8MHz
Unit
RSMAX
10
C0
40
pF
C
1
4.3
pF
COSCin
30
pF
COSCout
30
pF
R
P
1-10
M
Q
1250
MISCELLANEOUS REGISTER
00
10
1
10
VR02062B
New frequency
requested
New frequency
active when
f
OSC/4 & fOSC/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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