Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 7 16-BIT TIMER/EVENT COUNTER AA (TAA)

R01UH0042EJ0500 Rev.5.00 Page 283 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 TAAnCCR1 register last.

Rewrite the TAAnCCRm register after writing the TAAnCCR1 register after the INTTAAnCC1 signal is detected.

FFFFH

16-bit counter

0000H

TAAnCE bit

TAAnCCR0 register

CCR0 buffer register

TAAnCCR1 register

CCR1 buffer register

TOAAn1 pin output

INTTAAnCC0 signal

To transfer data from the TAAnCCRm register to the CCRm buffer register, the TAAnCCR1 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

TAAnCCR0 register and then set the active level to the TAAnCCR1 register.

To change only the cycle of the PWM waveform, first set the cycle to the TAAnCCR0 register, and then write

the same value to the TAAnCCR1 register.

To change only the active level width (duty factor) of the PWM waveform, only the TAAnCCR1 register has to

be set.

After data is written to the TAAnCCR1 register, the value written to the TAAnCCRm register is transferred to the

CCRm 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 TAAnCCR0 or TAAnCCR1 register again after writing the TAAnCCR1 register once, do so after the

INTTAAnCC0 signal is generated. Otherwise, the value of the CCRm buffer register may become undefined

because the timing of transferring data from the TAAnCCRm register to the CCRm buffer register conflicts with

writing the TAAnCCRm register.

Remark n = 0 to 3, 5

m = 0, 1