Datasheet

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

R01UH0042EJ0500 Rev.5.00 Page 515 of 1513

Aug 12, 2011

(2) PWM output mode operation timing

(a) Changing pulse width during operation

To change the PWM waveform while the counter is operating, write the TT0CCR1 register last.

Rewrite the TT0CCRn register after writing the TT0CCR1 register after the INTTT0CC1 signal is detected.

FFFFH

16-bit counter

0000H

TT0CE bit

TT0CCR0 register

CCR0 buffer register

TT0CCR1 register

CCR1 buffer register

TOT01 pin output

INTTT0CC0 signal

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

To change both the cycle and active level of the PWM waveform at this time, first set the cycle to the TT0CCR0

To change only the cycle of the PWM waveform, first set the cycle to the TT0CCR0 register, and then write the

same value (same as preset value of the TT0CCR1 register) to the TT0CCR1 register.

To change only the active level width (duty factor) of the PWM waveform, only the TT0CCR1 register has to be

set.

After data is written to the TT0CCR1 register, the value written to the TT0CCRn register is transferred to the

CCRn buffer register in synchronization with clearing of the 16-bit counter, and is used as the value compared

with the 16-bit counter.

To write the TT0CCR0 or TT0CCR1 register again after writing the TT0CCR1 register once, do so after the

INTTT0CC0 signal is generated. Otherwise, the value of the CCRn buffer register may become undefined

because the timing of transferring data from the TT0CCRn register to the CCRn buffer register conflicts with

writing the TT0CCRn register.

Remark n = 0, 1