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): 45/121頁
文件大?。?/td> 350K
代理商: ΜPD780983
CHAPTER 3 CONTROL
45
3.6.3 Setting PWM Switching Timing
Figure 3-7 shows the configuration of the 10-bit inverter control timer (TM7) when sawtooth wave modulation is
performed with the
μ
PD780988.
As shown in Figure 3-7, the carrier frequency is set in compare register CM3 and the dead time is set in dead
time setting register DTIME. The timings at which switching is performed are set in transfer buffers BFCM0 -
BFCM2.
Upon the occurrence of the INTTM7 interrupt, the values set in BFCM0 - BFCM2 are transferred to compare
registers CM0 - CM2 (
Figure 3-8
).
Figure 3-7. Block Diagram of the 10-Bit Inverter Control Timer
BFCM3
TM7
CM3
RTM0
INTTM7
BFCM0
CM0
BFCM1
CM1
BFCM2
CM2
DTIME
DTM0
DTM1
DTM2
f
X
f
X
/2
f
X
/2
2
f
X
/2
3
f
X
/2
4
f
X
/2
5
f
X
10
8
Pulse
generation
circuit
TO70
(U phase)
TO71
(U phase)
TO72
(V phase)
TO73
(V phase)
TO74
(W phase)
TO75
(W phase)
Output OFF function controlled
by external interrupt or INTWDT
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