R8C2K datasheet(452/471 Pages) RENESAS

452 / 471 page

R8C/2K Group, R8C/2L Group

23. Usage Notes

Rev.1.10

Dec 21, 2007

Page 435 of 450

REJ09B0406-0110

• If the value in the TRDGRA0 register is assumed to be m, the TRD0 register counts m-1, m, m+1, m, m-1, in

that order, when changing from increment to decrement operation.

When changing from m to m+1, the IMFA bit is set to 1. Also, bits CMD1 to CMD0 in the TRDFCR register

are set to 11b (complementary PWM mode, buffer data transferred at compare match between registers TRD0

and TRDGRA0), the content in the buffer registers (TRDGRD0, TRDGRC1, and TRDGRD1) is transferred to

the general registers (TRDGRB0, TRDGRA1, and TRDGRB1).

During m+1, m, and m-1 operation, the IMFA bit remains unchanged and data are not transferred to registers

such as the TRDGRA0 register.

Figure 23.4

Operation at Compare Match between Registers TRD0 and TRDGRA0 in

Complementary PWM Mode

No change

IMFA bit in

TRDSR0 register

Transferred from

buffer register

TRDGRB0 register

TRDGRA1 register

TRDGRB1 register

Count value in TRD0

Setting value in

TRDGRA0

m+1

Set to 0 by a program

Not transferred from buffer register

When bits CMD1 to CMD0 in the

TRDFCR register are set to 11b

(transfer from the buffer register to the

general register at compare match of

between registers TRD0 and

TRDGRA0).

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