參數(shù)資料
型號: μPD780983
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數(shù): 36/121頁
文件大小: 350K
代理商: ΜPD780983
CHAPTER 3 CONTROL
36
Explanation of major symbols
(1)
Sine wave table SINTBL[]/SINTBL1[]
0 to 2
π
is divided by 256 or 512 to give the sine wave data for each phase.
Because the sine is a decimal value within the range between the minimum value -1 and the maximum value +
1, to enable setting as 8- and 10-bit integer data, the sine is multiplied by the values shown below for 8 and 10
bits, respectively.
0FEH
(+1) - (-1) = 7FH
(+3FEH
Also, to enable comparison based on a compare instruction, -1 is made to correspond to 0, and +1 is made to
correspond to 0FEH/3FEH. Therefore, the value described in the sine wave table is equal to the either of the
following values for 8 and 10 bits, respectively.
7FH + 7FH x sin
θ
1FFH + 1FFH x sin
θ
(2)
V/f modulation ratio tables VFTBL1[] to VFTBL8[]
The V/f modulation ratio is defined for all output frequencies (157 frequencies from 4 to 160 Hz).
The modulation ratio is a decimal number in the range between 0 and 1.6. To enable the setting of the
modulation ratio as 8-bit integer data, the values which appear in the table are obtained by multiplying the
modulation ratio by 256.
Each V/f modulation ratio table contains the following modulation ratios:
10 Hz
60 Hz
80 Hz
110 Hz
VFTBL1:
0.4
1.0
1.6
VFTBL2:
0.2
1.0
1.6
VFTBL3:
0.4
1.4
1.6
VFTBL4:
0.2
1.4
1.6
VFTBL5:
0.4
1.0
1.2
VFTBL6:
0.2
1.0
1.2
VFTBL7:
0.4
1.2
1.2
VFTBL8:
0.2
1.2
1.2
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