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| 型號(hào)： | COP8SEC520M |
| 廠(chǎng)商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-Bit CMOS ROM Based and OTP Microcontrollers with 4k Memory and 128 Bytes EERAM |
| 中文描述： | 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PDSO20 |
| 封裝： | PLASTIC, SOP-20 |
| 文件頁(yè)數(shù)： | 14/47頁(yè) |
| 文件大小： | 491K |
| 代理商： | COP8SEC520M |
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5.0 Functional Description
(Continued)
5.9.1 Crystal Oscillator
CKI and CKO can be connected to make a closed loop crys-
tal (or resonator) controlled oscillator.
Table 1 shows the component values required for various
standard crystal values.
TABLE 1. Crystal Oscillator Configuration,
T
A
= 25C, V
CC
= 5V
R1 (k
)
R2 (M
)
C1 (pF)
C2 (pF)
CKI Freq.
(MHz)
10
4
0.455
0
0
1
1
1
32
39
100
32
39
5.6
100–156
5.9.2 R/C Oscillator
By selecting CKI as a single pin oscillator input, a single pin
R/C oscillator circuit can be connected to it. CKO is available
as a general purpose input, and /or HALT restart input.
Table 2 shows the variation in the oscillator frequency as a
function of the component (R and C) value.
TABLE 2. R/C Oscillator Configuration,
T
A
= 25C, V
CC
= 5V
R (k
)
3.3
5.6
6.8
C (pF)
82
100
100
CKI Freq.(MHz)
2.2 to 2.7
1.1 to 1.3
0.9 to 1.1
Instr. Cycle (μs)
3.7 to 4.6
7.4 to 9.0
8.8 to 10.8
DS100973-50
DS100973-51
FIGURE 10. Crystal and R/C Oscillator
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