M-V850E-IA4 Renesas Electronics America, M-V850E-IA4 Datasheet - Page 250

• Manufacturer Part Number: M-V850E-IA4
• Description: KIT EVAL V850E IA4 UPD70F3186
• Manufacturer: Renesas Electronics America

Specifications of M-V850E-IA4

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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(2) PWM output mode operation timing
(a) Changing pulse width during operation
To change the PWM waveform while the counter is operating, write the TPmCCR1 register last.
Rewrite the TPmCCRa register after writing the TPmCCR1 register after the INTTPmCC0 signal is
detected.
To transfer data from the TPmCCRa register to the CCRa buffer register, the TPmCCR1 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
TPmCCR0 register and then set the active level to the TPmCCR1 register.
To change only the cycle of the PWM waveform, first set the cycle to the TPmCCR0 register, and then
write the same value (same as preset value of the TPmCCR1 register) to the TPmCCR1 register.
To change only the active level width (duty factor) of the PWM waveform, only the TPmCCR1 register has
to be set.
After data is written to the TPmCCR1 register, the value written to the TPmCCRa register is transferred to
the CCRa 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 TPmCCR0 or TPmCCR1 register again after writing the TPmCCR1 register once, do so after
the INTTPmCC0 signal is generated. Otherwise, the value of the CCRa buffer register may become
undefined because the timing of transferring data from the TPmCCRa register to the CCRa buffer register
conflicts with writing the TPmCCRa register.
Remark
CCR0 buffer register
CCR1 buffer register
INTTPmCC0 signal
TPmCCR0 register
TPmCCR1 register
TOPm1 pin output
16-bit counter
TPmCE bit
V850E/IA3: m = 0, 2, a = 0, 1
V850E/IA4: m = 0, 2, 3, a = 0, 1
FFFFH
0000H
CHAPTER 6 16-BIT TIMER/EVENT COUNTER P (TMP)
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