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參數(shù)資料
| 型號(hào)： | C9706AY |
| 英文描述： | ST92141 - 8/16 BIT MCU FOR 3-PHASE AC MOTOR CONTROL |
| 中文描述： | CPU系統(tǒng)時(shí)鐘發(fā)生器| SSOP封裝| 48PIN |塑料 |
| 文件頁(yè)數(shù)： | 11/19頁(yè) |
| 文件大?。?/td> | 248K |
| 代理商： | C9706AY |
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C9706
Clock Generator for VIA VT8371/Athlon (K7) Chipset Systems
Approved Product
Cypress Semiconductor Corporation
525 Los Coches St.
Milpitas, CA 95035. Tel: 408-263-6300, Fax: 408-263-6571
http://www.cypress.com
Document#: 38-07041 Rev. **
05/02/2001
Page 11 of 19
Dial-a-Frequency
Feature (Cont.)
Where N and R values are programmed in binary into byte 4 for N and byte 7 for R. See table below for min
and max allowed values.
R
42
43
44
45
46
47
48
49
50
51
Min N
44
45
46
47
48
49
50
51
52
53
Max N
87
90
92
94
96
98
100
102
104
107
P is a large value PLL constant that depends on the frequency selection achieved through the hardware
selectors (S3, S2, S1, S0) or through the software selectors (byte0, bits 6,5,4,2,1). P value may be
determined from the following table:
S(4:0)
0100X, 00XXX
01010, 100XX,
10111,11000,11111
01011, 011XX, 10101, 10110,
11001, 1101X, 11101, 11110
10100, 11100
P
96016000
64010666.67
48008000
38406400
Therefore, if a 145MHz (use 145x10
6
) value is desired, then we should apply 145 into equation 1, and start
by choosing R to be 47 (assume the last frequency selection has the value P = 96016000):
145X10
6
= 96016000 X N => N = 70.97775371
47
Since this N number must be entered in Binary, it can only be an integer, so it must be rounded up or down.
Here we can rounded it up to 71, which will give us an exact CPU frequency of:
Fcpu = 96016000 X N = 145.045 MHz (accuracy + 310 ppm)
47
If the above frequency is not accurate enough, then you must choose another R value and start from the
beginning. For example choose R = 49 and this will yield an N = 73.99808365, which is rounded to 74. If the
74 is applied in the formula 1, then Fcpu = 145.0038 MHz(accuracy + 26 ppm).
Other R values within the above limits may also be evaluated.
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