SH7101 datasheet(218/560 Pages) RENESAS

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Section 8 Multifunction Timer Pulse Unit (MTU)

Rev.1.00 Sep. 18, 2008 Page 184 of 522

REJ09B0069-0100

Reset-Synchronized PWM Mode Operation: Figure 8.31 shows an example of operation in the

reset-synchronized PWM mode. TCNT_3 and TCNT_4 operate as upcounters. The counter is

cleared when a TCNT_3 and TGRA_3 compare-match occurs, and then begins counting up from

H'0000. The PWM output pin output toggles with each occurrence of a TGRB_3, TGRA_4,

TGRB_4 compare-match, and upon counter clears.

TGRA_3

TGRB_3

TGRB_4

H'0000

TGRA_4

TIOC3B

TIOC3D

TIOC4A

TIOC4C

TIOC4B

TIOC4D

Time

TCNT3 and TCNT4

values

Figure 8.31 Reset-Synchronized PWM Mode Operation Example

(When the TOCR’s OLSN = 1 and OLSP = 1)

8.4.8

Complementary PWM Mode

In the complementary PWM mode, three-phase output of non-overlapping positive and negative

PWM waveforms can be obtained by combining channels 3 and 4.

In complementary PWM mode, TIOC3B, TIOC3D, TIOC4A, TIOC4B, TIOC4C, and TIOC4D

pins function as PWM output pins, the TIOC3A pin can be set for toggle output synchronized with

the PWM period. TCNT_3 and TCNT_4 function as increment/decrement counters.

Table 8.39 shows the PWM output pins used. Table 8.40 shows the settings of the registers used.

A function to directly cut off the PWM output by using an external signal is supported as a port

function.

SH7101 Datasheet(PDF) 218 Page - Renesas Technology Corp