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CHAPTER 18 METER CONTROLLER/DRIVER
The relation among the ENn and MODn bits of the PMC register, DIRn1 and DIRn0 bits of the MCMPCn register,
and output pins is shown below.
ENn
MODn
DIRn1
DIRn0
SMn1
SMn2
SMn3
SMn4
Mode
(sin+)
(sin–)
(cos+)
(cos–)
0
×
×
×
PORT
PORT
PORT
PORT
Port mode
1
0
0
0
PWM
0
PWM
0
PWM mode full bridge
1
0
0
1
PWM
0
0
PWM
1
0
1
0
0
PWM
0
PWM
1
0
1
1
0
PWM
PWM
0
1
1
0
0
PWM
PORT
PWM
PORT
PWM mode half bridge
1
1
0
1
PWM
PORT
PORT
PWM
1
1
1
0
PORT
PWM
PORT
PWM
1
1
1
1
PORT
PWM
PWM
PORT
DIRn1 and DIRn0 mean the quadrant of sin and cos, and DIRn1, DIRn0 = 00 through 11 correspond to quadrants
1 through 4, respectively. The PWM signal is output to the specific pin of the + and – polarities of sin and cos
of each quadrant.
When ENn = 0, all the output pins are used as port pins regardless of MODn, DIRn1, and DIRn0.
When ENn = 1 and MODn = 0, the full bridge mode is set, and 0 is output to a pin that does not output a PWM
signal.
When ENn = 1 and MODn = 1, the half bridge mode is set, and the pin that does not output a PWM signal is
used as a port pin.
Caution
The output polarity of the PWM output changes when MCNT overflows.
Summary of Contents for mPD780973 Series
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