Renesas RX100 Series User Manual page 448

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(p) Example of Waveform Output for Driving AC Synchronous Motor (Brushless DC Motor)

In complementary PWM mode when MTU3 and MTU4 are used, a brushless DC motor can easily be controlled using

the TGCRA register. Figure 19.70 to Figure 19.73 show examples of brushless DC motor driving waveforms created

using TGCRA.

To switch the output phases for a 3-phase brushless DC motor by means of external signals detected with a Hall element,

etc., set the TGCRA.FB bit to 0. In this case, the external signals indicating the magnetic pole position should be input to

timer input pins MTIOC0A, MTIOC0B, and MTIOC0C in MTU0 (make appropriate settings with the MPC and port

mode registers (PMR) of the I/O ports). When an edge is detected at pin MTIOC0A, MTIOC0B, or MTIOC0C, the

output on/off state is switched automatically.

When the TGCRA.FB bit is 1, the output on/off state is switched when the UF, VF, or WF bit in TGCRA is set to 0 or 1.

The driving waveforms are output from the 6-phase PWM output pins for complementary PWM mode.

With this 6-phase output, while the output is turned on, chopping output is available through complementary PWM mode

output function by setting the N bit or P bit in TGCRA to 1. When the N bit or P bit is 0, the level output is selected.

The active level of the 6-phase output (on output level) can be set with the TOCR1A.OLSN and TOCR1A.OLSP bits

regardless of the setting of the N and P bits.

Figure 19.70

Example of Output Phase Switching by External Input (1)

6-phase output

Figure 19.71

Example of Output Phase Switching by External Input (2)

R01UH0822EJ0100 Rev.1.00

Jul 31, 2019

External input

6-phase output

When TGCRA.BDC = 1, TGCRA.N = 0, TGCRA.P = 0, TGCRA.FB = 0, and output active

level = high

External input

When TGCRA.BDC = 1, TGCRA.N = 1, TGCRA.P = 1, TGCRA.FB = 0, and output active

level = high

19. Multi-Function Timer Pulse Unit 3 (MTU3c)

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