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): 47/121頁
文件大?。?/td> 350K
代理商: ΜPD780983
CHAPTER 3 CONTROL
47
The setting of the timing for BFCM0 - BFCM2 is explained below.
Figure 3-9. Sine Wave Table
2
π
π
0
0
3FFH
1FFH
Figure 3-10. V/f Modulation
2
π
π
0
0
M
×
CM3
M
×
CM3
2
Figure 3-11. Offset Revision According to
V/f Modulation
2
π
π
0
M
×
CM3
2
CM3
2
-
α
-
α
M
×
CM3
2
VF
2
CM3
2
-
(4)
Timing setting
The value obtained by performing steps (1) to (3), above, is set in BFCM0X.
(1)
Sine wave data reference
Sine wave table reference is performed according to the
output phase.
The range of the reference value is between
0 - 0FFH/1FFH, as shown in Figure 3-9.
(2)
V/f modulation
The sine wave data is multiplied by V/f modulation ratio
VF.
The high-order 8 or 10 bits correspond to the carrier
frequency
multiplied
by
(
Figure 3-10
).
the
modulation
ratio
(3)
Offset revision according to V/f modulation
Within the V/f modulated sine wave data, because the
CM3/2 data exists together with much other data, offset
revision according to the V/f modulation is performed.
When the V/f modulation ratio is greater than or equal to
1, the offset value is decremented. When the V/f
modulation ratio is less than 1, the offset value is
incremented.
The value set for the offset determined by V/f modulation
is calculated as follows:
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