R8C2C Datasheet, PDF (587/615 Pages) Renesas Technology Corp – MCU

R8C/2C Group, R8C/2D Group
22. Usage Notes
When the value in the buffer register is set to 0000h:
Transfer takes place at compare match between registers TRD0 and TRDGRA0.
After this, when the buffer register is set to 0001h or above and a smaller value than the value of the
TRDGRA0 register, and a compare match occurs between registers TRD0 and TRDGRA0 for the first time
after setting, the value is transferred to the general register. After that, the value is transferred with the
timing selected by bits CMD1 to CMD0.
m+1
n2
n1
0000h
TRDGRD0 register
TRDGRB0 register
TRDIOB0 output
Count value in TRD0 register
Count value in TRD1 register
n1
0000h
Transfer ^Transfer
n2
n1
n1
0000h
Transfer
n1
Transfer
Transfer with timing
set by bits CMD1 to
CMD0
Transfer at compare
match between
registers TRD0 and
TRDGRA0 because
content in TRDGRD0
register is set to
0000h.
Transfer at compare
match between
registers TRD0 and
TRDGRA0 because
of first setting to
0001h ≤ n1 < m
Transfer with timing
set by bits CMD1 to
CMD0
TRDIOD0 output
m: Value set in TRDGRA0 register
The above applies under the following conditions:
• Bits CMD1 to CMD0 in the TRDFCR register are set to 10b (data in the buffer register is transferred at underflow of the TRD1 register in
PWM mode).
• Both the OLS0 and OLS1 bits in the TRDFCR register are set to 1 (active “H” for normal-phase and counter-phase).
Figure 22.7 Operation when Value in Buffer Register Is Set to 0000h in Complementary PWM
Mode
22.3.4.8 Count Source fOCO40M
• The count source fOCO40M can be used with supply voltage VCC = 3.0 to 5.5 V. For supply voltage other
than that, do not set bits TCK2 to TCK0 in registers TRDCR0 and TRDCR to 110b (select fOCO40M as
the count source).
Rev.2.00 Dec 05, 2007 Page 566 of 585
REJ09B0339-0200