R8C/20 Group, R8C/21 Group 14. Timers
Rev.2.00 Aug 27, 2008 Page 247 of 458
REJ09B0250-0200
BFC0, BFD0, BFC1, BFD1: Bits in TRDMR Register
Registers TRDGRC0, TRDGRC1, TRDGRD0, and TRDGRD1 are not used in PWM3 mode. To use them as
buffer registers, set bits BFC0, BFC1, BFD0, and BFD1 to 0 (general register) and write a value to the TRDGRC0,
TRDGRC1, TRDGRD0, or TRDGRD1 register. After this, bits BFC0, BFC1, BFD0, and BFD1 may be set to 1
(buffer register).
Table 14.34 TRDGRji Register Functions in PWM3 Mode
Register Setting Register Function PWM Output Pin
TRDGRA0 − General register. Set the PWM period.
Setting range: Value set in TRDGRA1 register or above
TRDIOA0
TRDGRA1 General register. Set the changing point (the active level
timing) of PWM output.
Setting range: Value set in TRDGRA0 register or below
TRDGRB0 General register. Set the changing point (the timing that
returns to initial output level) of PWM output.
Setting range: Value set in TRDGRB1 register or above
Value set in TRDGRA0 register or below
TRDIOB0
TRDGRB1 General register. Set the changing point (active level timing) of
PWM output.
Setting range: Value set in TRDGRB0 register or below
TRDGRC0 BFC0 = 0 (These registers are not used in PWM3 mode) −
TRDGRC1 BFC1 = 0
TRDGRD0 BFD0 = 0
TRDGRD1 BFD1 = 0
TRDGRC0 BFC0 = 1 Buffer register. Set the next PWM period.
(Refer to 14.3.2 Buffer Operation.)
Setting range: Value set in TRDGRC1 register or above
TRDIOA0
TRDGRC1 BFC1 = 1 Buffer register. Set the changing point of next PWM output.
(Refer to 14.3.2 Buffer Operation.)
Setting range: Value set in TRDGRC0 register or below
TRDGRD0 BFD0 = 1 Buffer register. Set the changing point of next PWM output.
(Refer to 14.3.2 Buffer Operation.)
Setting range: Value set in TRDGRD1 register or above,
setting value or below in TRDGRC0 register.
TRDIOB0
TRDGRD1 BFD1 = 1 Buffer register. Set the changing point of next PWM output.
(Refer to 14.3.2 Buffer Operation.)
Setting range: Value set in TRDGRD0 register or below
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