UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 267

• Manufacturer Part Number: UPD78F0838
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

In order to transfer data from the TPnCCRm register to the CCRm buffer register, the TPnCCR1 register
must be written.
To change both the cycle and active level width of the PWM waveform at this time, first set the cycle to the
TPnCCR0 register and then set the active level width to the TPnCCR1 register.
To change only the cycle of the PWM waveform, first set the cycle to the TPnCCR0 register, and then write
the same value to the TPnCCR1 register.
To change only the active level width (duty factor) of the PWM waveform, only the TPnCCR1 register has
to be set.
After data is written to the TPnCCR1 register, the value written to the TPnCCRm 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 TPnCCR0 or TPnCCR1 register again after writing the TPnCCR1 register once, do so after the
INTTPnCC0 signal is generated. Otherwise, the value of the CCRm buffer register may become undefined
because the timing of transferring data from the TPnCCRm register to the CCRm buffer register conflicts
with writing the TPnCCRm register.
Remark
n = 0 to 4
m = 0, 1
CHAPTER 6 16-BIT TIMER/EVENT COUNTER P (TMP)
Preliminary User’s Manual U19748EJ1V0UD
265