UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 285
UPD78F0838
Manufacturer Part Number
UPD78F0838
Description
8-bit Single-chip Microcontrollers
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD78F0838.pdf
(917 pages)
- Current page: 285 of 917
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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 TPnCCR1 register last.
Rewrite the TPnCCRm register after writing the TPnCCR1 register after the INTTPnCC1 signal is detected.
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 of the PWM waveform at this time, first set the cycle to the
TPnCCR0 register and then set the active level 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
CCR0 buffer register
CCR1 buffer register
INTTPnCC0 signal
TPnCCR0 register
TPnCCR1 register
TIOPn1 pin output
16-bit counter
TPnCE bit
n = 0 to 4,
m = 0, 1
FFFFH
0000H
CHAPTER 6 16-BIT TIMER/EVENT COUNTER P (TMP)
Preliminary User’s Manual U19748EJ1V0UD
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