R8CSLASH20 datasheet(181/501 Pages) RENESAS

181 / 501 page

R8C/20 Group, R8C/21 Group

14. Timers

Rev.2.00 Aug 27, 2008

Page 165 of 458

REJ09B0250-0200

14.3.2

Buffer Operation

The TRDGRCi register can be used as the buffer register of the TRDGRAi register, and the TRDGRDi register

can be used as the buffer register of the TRDGRBi register by the BFCi and BFDi bits in the TRDMR register.

• TRDGRAi buffer register: TRDGRCi register

• TRDGRBi buffer register: TRDGRDi register

Buffer operation depends on modes. Table 14.22 lists the Buffer Operation in Each Mode.

Figure 14.29 shows the Buffer Operation in Input Capture Function, and Figure 14.30 shows the Buffer

Operation in Output Compare Function.

i = 0 or 1

Figure 14.29

Buffer Operation in Input Capture Function

Table 14.22

Buffer Operation in Each Mode

Function and Mode

Transfer Timing

Transfer Register

Input Capture Function

Input capture signal input

Transfer content in TRDGRAi

(TRDGRBi) register to buffer register

Output Compare Function Compare match with TRDi register

and TRDGRAi (TRDGRBi) register

Transfer content in buffer register to

TRDGRAi (TRDGRBi) register

PWM Mode

Reset Synchronous PWM

Mode

Compare match withTRD0 register

and TRDGRA0 register

Transfer content in buffer register to

TRDGRAi (TRDGRBi) register

Complementary PWM

Mode

• Compare match with TRD0 register

and TRDGRA0 register

• TRD1 register underflow

Transfer content in buffer register to

TRDGRB0, TRDGRA1 and

TRDGRB1 registers

PWM3 Mode

Compare match with TRD0 register

and TRDGRA0 register

Transfer content in buffer register to

TRDGRA0, TRDGRB0, TRDGRA1

and TRDGRB1 registers

Transfer

TRDGRAi register

n-1

n+1

TRDIOAi input

TRDi register

i = 0 or 1

The above applies to the following conditions:

• The BFCi bit in the TRDMR register is set to 1. (The TRDGRCi register is used as the buffer register of

the TRDGRAi register.)

• The IOA2 to IOA0 bits in the TRDIORAi register are set to 100b (input capture at the falling edge).

Transfer

TRDGRCi register

(buffer)

TRDGRCi

(buffer)

TRDGRAi

TRDi

TRDIOAi input

(input capture signal)

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