R8C/20 Group, R8C/21 Group 14. Timers
Rev.2.00 Aug 27, 2008 Page 233 of 458
REJ09B0250-0200
BFC0, BFD0, BFC1, BFD1: Bits in TRDMR register
Since values cannot be written to the TRDGRB0, TRDGRA1, or TRDGRB1 register directly after count
operation starts (prohibited item), use the TRDGRD0, TRDGRC1, or TRDGRD1 register as a buffer register.
However, to write data to the TRDGRD0, TRDGRC1, or TRDGRD1 register, set bits BFD0, BFC1, and BFD1
to 0 (general register). After this, bits BFD0, BFC1, and BFD1 may be set to 1 (buffer register).
Table 14.32 TRDGRji Register Functions in Complementary PWM Mode
Register Setting Register Function PWM Output Pin
TRDGRA0
− General register. Set the PWM period at initialization.
Setting range: Setting value or above in TRD0 register
FFFFh - TRD0 register setting value
or below
Do not write when the TSTART0 and TSTART1 bits in the
TRDSTR register are set to 1 (count starts).
(Output inversed every
half period of TRDIOC0
pin)
TRDGRB0
− General register. Set the changing point of PWM1 output at
initialization.
Setting range: Setting value or above in TRD0 register
TRDGRA0 register - TRD0 register setting
value or below
Do not write when the TSTART0 and TSTART1 bits in the
TRDSTR register are set to 1 (count starts).
TRDIOB0
TRDIOD0
TRDGRA1
− General register. Set the changing point of PWM2 output at
initialization.
Setting range: Setting value or above in TRD0 register
TRDGRA0 register - TRD0 register setting
value or below
Do not write when the TSTART0 and TSTART1 bits in the
TRDSTR register are set to 1 (count starts).
TRDIOA1
TRDIOC1
TRDGRB1
− General register. Set the changing point of PWM3 output at
initialization.
Setting range: Setting value or above in TRD0 register
TRDGRA0 register - TRD0 register setting
value or below
Do not write when the TSTART0 and TSTART1 bits in the
TRDSTR register are set to 1 (count starts).
TRDIOB1
TRDIOD1
TRDGRC0
−
These registers not used in complementary PWM mode.
−
TRDGRD0 BFD0 = 1 Buffer register. Set the changing point of next PWM1 output.
(Refer to
14.3.2 Buffer Operation)
Setting range: Setting value or above in TRD0 register
TRDGRA0 register - TRD0 register setting
value or below
Set this register to the same value as the TRDGRB0 register
for the initialization.
TRDIOB0
TRDIOD0
TRDGRC1 BFC1 = 1 Buffer register. Set the changing point of next PWM2 output.
(Refer to
14.3.2 Buffer Operation)
Setting range: Setting value or above in TRD0 register
TRDGRA0 register - TRD0 register setting
value or below
Set this register to the same value as the TRDGRA1 register
for the initialization.
TRDIOA1
TRDIOC1
TRDGRD1 BFD1 = 1 Buffer register. Set the changing point of next PWM3 output.
(Refer to
14.3.2 Buffer Operation)
Setting range: Setting value or above in TRD0 register
TRDGRA0 register - TRD0 register setting
value or below
Set this register to the same value as the TRDGRB1 register
for the initialization.
TRDIOB1
TRDIOD1
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