Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 9 16-BIT TIMER/EVENT COUNTER T (TMT)

R01UH0042EJ0500 Rev.5.00 Page 541 of 1513

Aug 12, 2011

Figure 9-44. Basic Timing in Triangular-Wave PWM Output Mode

FFFFH

16-bit counter

0000H

TT0CE bit

TT0CCR0 register

CCR0 buffer register

INTTT0CC0 signal

TOT00 pin output

TT0CCR1 register

CCR1 buffer register

INTTT0CC1 signal

TOT01 pin output

INTTT0OV signal

The 16-bit counter is cleared from FFFFH and 0000H and starts counting when the TT0CE bit is set to 1. The triangular

PWM waveform is output from the TOT01 pin.

In the triangular-wave PWM output mode, the counter counts up or down. When the 16-bit counter reaches 0000H

while it is counting down, an overflow interrupt request signal (INTTT0OV) is generated. At this time, the

TT0OPT0.TT0OVF bit is not set to 1. If the count value of the 16-bit counter matches the value of the CCR0 buffer register

while the counter is counting up, a compare match interrupt request signal (INTTT0CC0) is generated.

The counting direction is changed from up to down when the value of the 16-bit counter matches that of the CCR0

buffer register, and from down to up when the counter is cleared to 0000H.

The PWM waveform can be changed by rewriting the TT0CCRn register during operation. To change the PWM

waveform during operation, write the TT0CCR1 register last.

The cycle of the triangular PWM waveform is set by the TT0CCR0 register and its duty factor is set by the TT0CCR1

when the 16-bit counter reaches 0000H while it is counting down.

Even when changing only the cycle of the PWM waveform, first set a period to the TT0CCR0 register, and then write

the same value (value same as that set to the TT0CCR1 register) to the TT0CCR1 register.

To transfer data from the TT0CCRn register to the CCRn buffer register, the data must be written to the TT0CCR1