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| 型號： | COP8SAC7SLB9 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-Bit CMOS ROM Based and One-Time Programmable OTP Microcontroller with 1k to 4k Memory, Power On Reset, and Very Small Packaging |
| 中文描述： | 8-BIT, OTPROM, 10 MHz, MICROCONTROLLER, QCC28 |
| 封裝： | CSP-28 |
| 文件頁數(shù)： | 18/60頁 |
| 文件大?。?/td> | 787K |
| 代理商： | COP8SAC7SLB9 |
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6.0 Functional Description
(Continued)
The contents of data registers and RAM are unknown follow-
ing the on-chip reset.
6.8 OSCILLATOR CIRCUITS
There are four clock oscillator options available: Crystal Os-
cillator 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 2
TABLE 2. 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
6.8.1 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 3shows the component values re-
quired 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 3. Crystal Oscillator Configuration,
T
A
= 25C, V
CC
= 5V
R1 (k
)
0
0
0
5.6
R2 (M
)
1
1
1
1
C1 (pF)
30
32
45
100
C2 (pF)
30
32
30–36
100–156
CKI Freq. (MHz)
15
10
4
0.455
6.8.2 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 connection
diagram.
6.8.3 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 con-
trolled oscillator has on-chip resistor and capacitor for maxi-
mum R/C oscillator frequency operation. The maximum fre-
quency is 5 MHz
±
35% for V
between 4.5V to 5.5V and
temperature range of 40C to +85C. For max frequency
operation, the CKI pin should be left floating. For lower fre-
quencies, an external capacitor should be connected be-
tween CKI and either V
or GND. Immunity of the R/C os-
cillator to external noise can be improved by connecting 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 4 shows the oscillator frequency as a
function of external capacitance on the CKI pin. Figure 14
shows the R/C oscillator configuration.
TABLE 4. R/C Oscillator Configuration,
40C to +85C, V
= 4.5V to 5.5V,
OSC Freq. Variation of
±
35%
External Capacitor
(pF)
0
9
52
150
TBD
R/C OSC Freq
(MHz)
5
4
2
1
32 kHz
Instr. Cycle
(μs)
2.0
2.5
5.0
10
312.5
DS012838-15
FIGURE 10. Reset Timing (Power-On Reset Enabled)
with V
CC
Tied to RESET
DS012838-16
FIGURE 11. Reset Circuit Using Power-On Reset
www.national.com
18
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