R01UH0823EJ0100 Rev.1.00 Page 634 of 1823
Jul 31, 2019
RX23W Group 23. Multi-Function Timer Pulse Unit 2 (MTU2a)
(26) Operation When Error Occurs in Reset-Synchronized PWM Mode and Operation is Restarted
in Normal Mode
Figure 23.141 shows a case in which an error occurs in reset-synchronized PWM mode and operation is restarted in
normal mode after re-setting.
Figure 23.141 Error Occurrence in Reset-Synchronized PWM Mode, Recovery in Normal Mode
(1) After a reset, the MTU output goes low and the ports enter high-impedance state.
(2) Select the reset-synchronized PWM mode output level and enable or disable cyclic output with the TOCR register.
(3) Set reset-synchronized PWM mode.
(4) Enable output in MTU3 and MTU4 with the TOER register.
(5) Use the MPC and the port mode register (PMR) for the I/O port to set up MTU output.
(6) Start count operation by setting the TSTR register.
(7) The reset-synchronized PWM waveform is output on compare match occurrence.
(8) An error occurs.
(9) Use the port direction register (PDR) and port mode register (PMR) for the input port pin to switch it to operate as a
general output port pin, and the port output data register (PODR) to select output of the non-active level.
(10) Stop count operation by setting the TSTR register. (MTU output becomes the initial reset-synchronized PWM
output value.)
(11) Set normal mode (positive-phase MTU output goes low, and negative-phase output goes high).
(12) Initialize the pins with the TIOR register.
(13) Use the MPC and the port mode register (PMR) for the I/O port to set up MTU output.
(14) Restart operation by setting the TSTR register.
(1)
Reset
MTU module output
(2)
TOCR
(3)
TMDR
(RPWM)
(4)
TOER
(1)
(6)
TSTR
(1)
(7)
Match
(8)
Error
occurs
(9)
Port
output
(10)
TSTR
(0)
(11)
TMDR
(normal)
(12)
TIOR
(1 init
0 out)
(14)
TSTR
(1)
MTIOC3A
MTIOC3B
MTIOC3D
PORT output
Pxx
Pxx
Pxx
(5)
MPC
(MTU)
(13)
MPC
(MTU)
Hi-Z
Hi-Z
Hi-Z
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