SH7261 datasheet(628/1348 Pages) RENESAS

628 / 1348 page

Section 12 Multi-Function Timer Pulse Unit 2 (MTU2)

Rev. 2.00 Sep. 07, 2007 Page 596 of 1312

REJ09B0320-0200

(26) Operation when Error Occurs during Reset-Synchronized PWM Mode Operation, and

Operation is Restarted in Normal Mode

Figure 12.150 shows an explanatory diagram of the case where an error occurs in reset-

synchronized PWM mode and operation is restarted in normal mode after re-setting.

Power-on

reset

MTU2

module output

PB17

PB16

PB19

TOCR

TMDR

(RPWM)

PFC

(MTU2)

TOER

(1)

TSTR

(1)

Match

Error

occurs

PFC

(PORT)

TSTR

(0)

TMDR

(normal)

TIOR

(1 init

0 out)

PFC

(MTU2)

TSTR

(1)

TIOC3A

TIOC3B

TIOC3D

Port output

High-Z

Figure 12.150 Error Occurrence in Reset-Synchronized PWM Mode,

Recovery in Normal Mode

After a power-on reset, MTU2 output is low and ports are in the high-impedance state.

Select the reset-synchronized PWM output level and cyclic output enabling/disabling with

TOCR.

Set reset-synchronized PWM.

Enable channel 3 and 4 output with TOER.

Set MTU2 output with the PFC.

The count operation is started by TSTR.

The reset-synchronized PWM waveform is output on compare-match occurrence.

An error occurs.

Set port output with the PFC and output the inverse of the active level.

10. The count operation is stopped by TSTR. (MTU2 output becomes the reset-synchronized

PWM output initial value.)

11. Set normal mode. (MTU2 positive phase output is low, and negative phase output is high.)

12. Initialize the pins with TIOR.

13. Set MTU2 output with the PFC.

14. Operation is restarted by TSTR.

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