R8C2K datasheet(220/471 Pages) RENESAS

220 / 471 page

R8C/2K Group, R8C/2L Group

16. Timers

Rev.1.10

Dec 21, 2007

Page 203 of 450

REJ09B0406-0110

16.3.6

PWM Mode

This mode outputs PWM waveforms. A maximum of three PWM waveforms with the same period are output.

The PWM mode, or the timer mode, can be selected for each individual pin. (However, since the TRCGRA

mode.)

Table 16.20 lists the Specifications of PWM Mode, Figure 16.53 shows a Block Diagram of PWM Mode,

Figure 16.54 shows the registers associated with the PWM mode, Table 16.21 lists the Functions of TRCGRj

j = B, C, or D

h = A, B, C, or D

Table 16.20

Specifications of PWM Mode

Item

Specification

Count source

f1, f2, f4, f8, f32, fOCO40M, or external signal (rising edge) input to

TRCCLK pin

Count operation

Increment

PWM waveform

PWM period: 1/fk × (m + 1)

Active level width: 1/fk × (m - n)

Inactive width: 1/fk × (n + 1)

fk: Count source frequency

m: TRCGRA register setting value

n: TRCGRj register setting value

Count start condition

1 (count starts) is written to the TSTART bit in the TRCMR register.

Count stop condition

0 (count stops) is written to the TSTART bit in the TRCMR register.

PWM output pin retains output level before count stops, TRC register

retains value before count stops.

Interrupt request generation

timing

• Compare match (contents of registers TRC and TRCGRh match)

• The TRC register overflows.

TRCIOA pin function

Programmable I/O port

TRCIOB, TRCIOC, and

TRCIOD pin functions

Programmable I/O port or PWM output (selectable individually by pin)

INT0 pin function

Programmable I/O port, pulse output forced cutoff signal input, or INT0

interrupt input

Read from timer

The count value can be read by reading the TRC register.

Write to timer

The TRC register can be written to.

Select functions

• One to three pins selectable as PWM output pins per channel

One or more of pins TRCIOB, TRCIOC, and TRCIOD

• Active level selectable by individual pin

• Buffer operation (Refer to 16.3.3.2 Buffer Operation.)

• Pulse output forced cutoff signal input (Refer to 16.3.3.4 Forced

Cutoff of Pulse Output.)

m+1

n+1

m-n

(“L” is active level)

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