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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(jī)微控制器（8位單片微控制器） |
| 文件頁數(shù)： | 29/121頁 |
| 文件大?。?/td> | 350K |
| 代理商： | ΜPD780983 |
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CHAPTER 3 CONTROL
29
3.3 RAM AND FLAGS
Tables 3-3 to 3-6 list the variables and flags used by the sample application.
Depending on the linker, variables and flags are allocated such that they can be relocated. To allocate 2-byte
variables to an even-numbered address, however, it is necessary to specify the relocatable attribute.
Table 3-3. Variables Used for Inverter Control (1/2)
Symbol
Bytes
Use, setting, comparison
Set value
PMODE
1
PWM output mode
Set by mode transition
Stop mode:
Fixed output mode:
Output change mode: 2
0
1
NFOUT
1
Output frequency
Set by inverter output setting
During output:
(Target frequency)
Example
10 Hz: 0AH (10)
While stopped: 0FFH
RFOUT
1
Target frequency
Set by key setting
Perform reference based on inverter
output setting.
Output setting: (Target frequency)
Stop setting:
0FFH
NCRRY
1
Carrier frequency number
Set by key setting
Perform reference based on inverter
output setting.
Argument at CRRYTBL[] reference
1 - 64H (100)
NDEAD
1
Dead time number
Set by key setting
Perform reference based on inverter
output setting.
Argument at DEADTBL[] reference
1 - 20H (32)
NCHNG
1
Frequency change rate number
Set by key setting
Perform reference based on inverter
output setting.
Argument at CHNGTBL[] reference
0 - 3
WAITCNT
2
Frequency change wait counter
Set by inverter output setting
After being set, the CHNGTBL[] reference value is
decremented by 1 until 0 is reached.
VFP
2
V/f modulation ratio pointer
Perform reference and setting based on
inverter output setting.
Argument at VFTBL[] reference
0 - 9DH (157)
SADR
2
Value added to sine wave reference
phase
Perform reference and setting based on
INTTM7 processing.
Transfer of BSADR set value
BSADR
2
Transfer buffer used for SADR change
Set by inverter output setting
Value added to sine wave reference phase
(Output frequency)
(Carrier frequency)x n
where n = number of sine wave data items x number of
interrupt occurrences
OFFSET
2
Offset revision determined by V/f
modulation
Perform reference and setting based on
INTTM7 processing.
Transfer BOFFSET set value
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