SH7261 datasheet(623/1348 Pages) RENESAS

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

Rev. 2.00 Sep. 07, 2007 Page 591 of 1312

REJ09B0320-0200

(21) Operation when Error Occurs during Complementary PWM Mode Operation, and

Operation is Restarted in Normal Mode

Figure 12.145 shows an explanatory diagram of the case where an error occurs in complementary

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

Power-on

reset

TOCR

TMDR

(CPWM)

PFC

(MTU2)

TOER

(1)

TSTR

(1)

Match

Error

occurs

PFC

(PORT)

TSTR

(0)

TMDR

(normal)

TIOR

(1 init

0 out)

PFC

(MTU2)

TSTR

(1)

MTU2

module output

TIOC3A

TIOC3B

TIOC3D

Port output

PB17

PB16

PB19

High-Z

Figure 12.145 Error Occurrence in Complementary 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 complementary PWM output level and cyclic output enabling/disabling with

TOCR.

Set complementary PWM.

Enable channel 3 and 4 output with TOER.

Set MTU2 output with the PFC.

The count operation is started by TSTR.

The complementary 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 complementary PWM

output initial value.)

11. Set normal mode. (MTU2 output goes low.)

12. Initialize the pins with TIOR.

13. Set MTU2 output with the PFC.

14. Operation is restarted by TSTR.

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