SH7041A datasheet(363/923 Pages) RENESAS

363 / 923 page

325

Complementary PWM Mode: Three-phase complementary positive and negative PWM

waveforms whose positive and negative phases do not overlap can be obtained using channels 3

and 4. When set for complementary PWM mode, TGR3A, TGR3B, TGR4A, and TGR4B become

output compare registers. The TIOC3B, TIOC3D, TIOC4A, TIOC4B, TIOC4C, and TIOC4D pins

also automatically become PWM output pins while TCNT3 and TCNT4 become up/down

counters.

12.4.2

Basic Functions

Always select MTU external pin set function using the pin function controller (PFC).

Counter Operation: When a start bit (CST0–CST4) in the timer start register (TSTR) is set to 1,

the corresponding timer counter (TCNT) starts counting. There are two counting modes: a free-

running mode and a periodic mode.

To select the counting operation (figure 12.7):

1.Set bits TPSC2–TPSC0 in the TCR to select the counter clock.At the same time, set bits

CKEG1 and CKEG0 in the TCR to select the desired edge of the input clock.

2.To operate as a periodic counter, set the CCLR2–CCLR0 bits in the TCR to select TGR as a

clearing source for the TCNT.

3.Set the TGR selected in step 2 as an output compare register using the timer I/O control

4.Write the desired cycle value in the TGR selected in step 2.

5.Set the CST bit in the TSTR to 1 to start counting.

SH7041A Datasheet(PDF) 363 Page - Renesas Technology Corp