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| 型號： | HMS77C2001 |
| 英文描述： | [General Purpose(2) : ADC/ LED/ SCI/ PWM] |
| 中文描述： | [通用（2）：藝術(shù)發(fā)展局/發(fā)光/工商/脈寬調(diào)制] |
| 文件頁數(shù)： | 37/59頁 |
| 文件大?。?/td> | 660K |
| 代理商： | HMS77C2001 |
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HMS77C2000/2001
34
Nov. 2002 Ver 1.1
12.2 OSCILLATOR CONFIGURATIONS
12.2.1 OSCILLATOR TYPES
The HMS77C2000 and HMS77C2001 can be operated in
four different oscillator modes. The user can program two
configuration bits (FOSC1:FOSC0) to select one of these
four modes:
- LF: Low Frequency
- XT: Crystal/resonator
- IRC: Internal 4 MHz Oscillator
- ERC: External Resistor/Capacitor
12.2.2 CRYSTAL OSCILLATOR / CERAMIC RESO-
NATORS
In XT or LF modes, a crystal or ceramic resonator is con-
nected to the UP5/X
IN
and UP4/X
OUT
pins to establish os-
cillation (Figure 12-2). The HMS77C2000 and
HMS77C2001 oscillator design requires the use of a paral-
lel cut crystal. Use of a series cut crystal may give a fre-
quency out of the crystal manufacturers specifications.
When in XT or LF modes, the device can have an external
clock source drive the UP5/X
IN
pin (Figure 12-3).
Note:
These values are for design guidance only. Since
each resonator has its own characteristics, the user
should consult the resonator manufacturer for ap-
propriate values of external components.
Note:
These values are for design guidance only. Rs may
be required to avoid overdriving crystals with low
drive level specification. Since each crystal has its
own characteristics, the user should consult the
crystal manufacturer for appropriate values of exter-
nal components.
12.2.3 EXTERNAL RC OSCILLATOR
For timing insensitive applications, the RC device option
offers additional cost savings. The RC oscillator frequency
is a function of the supply voltage, the resistor (Rext) and
capacitor (Cext) values, and the operating temperature. In
addition to this, the oscillator frequency will vary from unit
to unit due to normal process parameter variation. Further-
more, the difference in lead frame capacitance between
FIGURE 12-2 CRYSTAL OPERATION OR CERAMIC
RESONATOR (XT OR LF OSC
CONFIGURATION)
X
IN
X
OUT
To internal
logic
RF
(2)
SLEEP
XTAL
C2
1
C1
1
Note 1: See Capacitor Selection tables for recommended
values of C1 and C2.
2: RF varies with the crystal chosen
(approx. value = 10 M
).
FIGURE 12-3 EXTERNAL CLOCK INPUT OPERATION
(XT OR LF OSC CONFIGURATION)
Osc
Type
Resonator
Freq
Cap.Range
C1
Cap. Range
C2
XT
4.0 MHz
30 pF
30 pF
TABLE 12-1 CAPACITOR SELECTION FOR CERAMIC
RESONATORS
Osc
Type
Crystal
Freq
Cap.Range
C1
Cap. Range
C2
LF
32 kHz
1
1.
For V
DD
> 4.5V, C1 = C2
≈
30 pF is recommended.
15 pF
15 pF
XT
200 kHz
1 MHz
4 MHz
47~68 pF
15 pF
15 pF
47-68 pF
15 pF
15 pF
TABLE 12-2 CAPACITOR SELECTION FOR CRYSTAL
OSCILLATOR
X
OUT
X
IN
OPEN
Clock from
ext. system
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