參數(shù)資料
型號(hào): 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(jī)微控制器(8位單片微控制器)
文件頁數(shù): 30/121頁
文件大?。?/td> 350K
代理商: ΜPD780983
CHAPTER 3 CONTROL
30
Table 3-3. Variables Used for Inverter Control (2/2)
Symbol
Bytes
Use, setting, comparison
Set value
BOFFSET
2
Transfer buffer used for OFFSET change
Set by inverter output setting
Offset revision determined by V/f modulation
BVF
2
BCM03
2
-
VF
2
V/f modulation multiplier
Perform reference and setting based on INTTM7
processing.
Transfer BVF set value
BVF
2
Transfer buffer used for VF change
Set by inverter output setting
V/f modulation multiplier
TM7 operation clock
2 x fc
VFTBL[ ]
80H
x
BCM03
2
Transfer buffer used for CM03 change
Set by inverter output setting
CM03 set value
TM7 operation clock
2 x fc
VFTBLNO
2
V/f table address
Set in variable initialization
Referenced in inverter output setting
Start address of VFTBL1 to VFTBL8
TM7CLK
1
TM7 count clock
Set in variable initialization
Referenced in inverter output setting
0 to 7
Example
fx/2: 1
TM7CNT
1
Number of INTTM7 occurrences
Set in variable initialization
Referenced in the inverter output setting
1 to 8
Example
One occurrence per two TM7
underflow occurrences: 2
fc : Carrier frequency
Explanation of major symbols
(1)
VFP
The argument at VFTBL1-8[] reference is set. In VFTBL1-8[], to describe the 157 words of the V/f modulation
ratio corresponding to 4 to 160 Hz, VFP can be set to a value within the range of 0 to 9DH (157).
(2)
SADR, BSADR
The sine wave reference phase increment is set. To equally divide the sine wave table data count (512/256
words) by the carrier wave count for one sine wave cycle, calculation is performed as follows:
(Output frequency)
(Carrier frequency)
x (Number of INTTM7 interrupt occurrences)
x (Sine wave data count)
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