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| 型号： | COP8SGF840Q6 |
| 厂商： | National Semiconductor Corporation |
| 英文描述： | 8-Bit CMOS ROM Based and OTP Microcontrollers with 8k to 32k Memory, Two Comparators and USART |
| 中文描述： | 8位的CMOS基于ROM和OTP微控制器具有8K到32K的内存，2个比较器和USART |
| 文件页数： | 20/62页 |
| 文件大小： | 913K |
| 代理商： | COP8SGF840Q6 |
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5.0 Functional Description
(Continued)
5.10 OSCILLATOR CIRCUITS
There are four clock oscillator options available: Crystal
Oscillator with or without on-chip bias resistor, R/C Oscillator
with on-chip resistor and capacitor, and External Oscillator.
The oscillator feature is selected by programming the ECON
register, which is summarized in Table 1
TABLE 1. Oscillator Option
ECON4
0
1
0
1
ECON3
0
0
1
1
Oscillator Option
External Oscillator
Crystal Oscillator without Bias Resistor
R/C Oscillator
Crystal Oscillator with Bias Resistor
5.10.1 Crystal Oscillator
The crystal Oscillator mode can be selected by programming
ECON Bit 4 to 1. CKI is the clock input while G7/CKO is the
clock generator output to the crystal. An on-chip bias resistor
connected between CKI and CKO can be enabled by pro-
gramming ECON Bit 3 to 1 with the crystal oscillator option
selection. The value of the resistor is in the range of 0.5M to
2M (typically 1.0M). Table 2 shows the component values
required for various standard crystal values. Resistor R2 is
only used when the on-chip bias resistor is disabled. Figure
12 shows the crystal oscillator connection diagram.
TABLE 2. Crystal Oscillator Configuration,
T
A
= 25C, V
CC
= 5V
R1 (k
)
R2 (M
)
C1 (pF)
C2 (pF)
CKI Freq.
(MHz)
15
10
4
0.455
0
0
0
1
1
1
1
18
20
25
100
18
20
25
5.6
100–156
5.10.2 External Oscillator
The External Oscillator mode can be selected by program-
ming ECON Bit 3 to 0 and ECON Bit 4 to 0. CKI can be
driven by an external clock signal provided it meets the
specified duty cycle, rise and fall times, and input levels.
G7/CKO is available as a general purpose input G7 and/or
Halt control. Figure 13 shows the external oscillator connec-
tion diagram.
5.10.3 R/C Oscillator
The R/C Oscillator mode can be selected by programming
ECON Bit 3 to 1 and ECON Bit 4 to 0. In R/C oscillation
mode, CKI is left floating, while G7/CKO is available as a
general purpose input G7 and/or HALT control. The R/C
controlled oscillator has on-chip resistor and capacitor for
maximum R/C oscillator frequency operation. The maximum
frequency is 5 MHz
±
35% for V
between 4.5V to 5.5V
and temperature range of 40C to +85C. For max fre-
quency operation, the CKI pin should be left floating. For
lower frequencies, an external capacitor should be con-
nected between CKI and either V
or GND. Immunity of the
R/C oscillator to external noise can be improved by connect-
ing one half the external capacitance to V
and one half to
GND. PC board trace length on the CKI pin should be kept
as short as possible. Table 3 shows the oscillator frequency
as a function of external capacitance on the CKI pin. Figure
14 shows the R/C oscillator configuration.
TABLE 3. R/C Oscillator Configuration,
40C to +85C, V
= 4.5V to 5.5V,
OSC Freq. Variation of
±
35%
External
Capacitor (pF)*
0
9
52
125
6100
* Assumes 3-5 pF board capacitance.
R/C OSC Freq
(MHz)
5
4
2
1
32 kHz
Instr. Cycle (μs)
2.0
2.5
5.0
10
312.5
With On-Chip Bias Resistor
Without On-Chip Bias Resistor
10131717
10131718
FIGURE 12. Crystal Oscillator
C
www.national.com
20
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