SH7280 Group

MTU2: Output of Complementary Pairs of PWM Signals in Three Phases

(Complementary PWM Mode)

REJ06B0887-0100/Rev.1.00

June 2009

Page 3 of 24

2.

Description of the Sample Application

In this sample program, MTU2 is used in complementary PWM mode.

2.1

Operational Overview of Module Used

2.1.1

Multi-Function Timer Pulse Unit 2 (MTU2)

MTU2 is a multi-functional timer unit that has six 16-bit timer channels. Settings for compare-match function, input-

capture function, etc. can be made for each channel. Settings for complementary PWM mode and reset-synchronized

PWM mode are made for channels 3 and 4, enabling the control of six PWM output lines.

For details on MTU2, see the section on MTU2 in the SH7137 Group Hardware Manual (REJ09B0402).

Table 2 gives an overview of MTU2 and figure 2 is a block diagram of MTU2.

Table 2

Overview of MTU2

Item

Description

Number of channels

16-bit timer

× 6 channels (channels 0 to 5)

Counter clock

The clock signal for counter input can be selected from among 8 different input

clock signals (except for channel 5, with only 4 different clock signals available).

Operation of channels 0

to 5

• Waveform output on compare match

• Input capture function

• Counter clearing

• Simultaneous writing to multiple timer counters (TCNT)

• Simultaneous clearing by compare match and input capture

• Input to and output from registers are synchronized with counter operation.

• PWM output in up to 12 phases in combination with synchronous operation

Triggers for A/D converter

• A/D converter start trigger can be generated.

• In complementary PWM mode, interrupts at the crest and trough of the

counter value and A/D converter start triggers can be skipped.

Buffered operation

• Settings for buffered operation of registers can be made to channels 0, 3,

and 4.

Operating modes

• Settings for PWM mode can be made on channels 0 to 4.

• Settings for phase counting mode can be set for each of channels 1 and 2

individually.

• Waveform output in a total of six phases, including the positive and inverse

signals for three phases, is possible in reset-synchronized PWM mode or

complementary PWM mode.

Interrupt requests

• 28 different interrupt sources

(interrupt generation by compare match, input capture, etc.)

Others

• Cascade-connection operation

• High-speed access by internal 16-bit bus

• Automatic transfer of register data is enabled.

• Module standby mode can be set.

• Dead time compensation counter is available in channel 5.