R8C2K datasheet(276/471 Pages) RENESAS

276 / 471 page

R8C/2K Group, R8C/2L Group

16. Timers

Rev.1.10

Dec 21, 2007

Page 259 of 450

REJ09B0406-0110

i = 0 or 1

Table 16.41

PWM Mode Specifications

Item

Specification

Count sources

f1, f2, f4, f8, f32, fOCO40M

External signal input to the TRDCLK pin (valid edge selected by a

program)

Count operations

Increment

PWM waveform

PWM period: 1/fk x (m+1)

Active level width: 1/fk x (m-n)

Inactive level width: 1/fk x (n+1)

fk: Frequency of count source

m: Value set in the TRDGRAi (i = 0 or 1) register

n: Value set in the TRDGRji (j = B, C, or D) register

Count start condition

1 (count starts) is written to the TSTARTi bit in the TRDSTR register.

Count stop conditions

• 0 (count stops) is written to the TSTARTi bit in the TRDSTR register

when the CSELi bit in the TRDSTR register is set to 1.

The PWM output pin holds output level before the count stops.

• When the CSELi bit in the TRDSTR register is set to 0, the count

stops at the compare match in the TRDGRAi register.

The PWM output pin holds level after output change by compare

match.

Interrupt request generation

timing

• Compare match (The content of the TRDi register matches content of

the TRDGRji register.)

• TRDi register overflows

TRDIOA0 pin function

Programmable I/O port or TRDCLK (external clock) input

TRDIOA1 pin function

Programmable I/O port

TRDIOB0, TRDIOC0, TRDIOD0,

TRDIOB1, TRDIOC1, TRDIOD1

pin functions

Programmable I/O port or pulse output (selectable 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 TRDi register.

Write to timer

The value can be written to the TRDi register.

Select functions

• 1 to 3 PWM output pins selected per 1 channel

Either 1 pin or multiple pins of the TRDIOBi, TRDIOCi or TRDIODi

pin.

• The active level selected by pin.

• Initial output level selected by pin.

• Synchronous operation (Refer to 16.4.3 Synchronous Operation.)

• Buffer operation (Refer to 16.4.2 Buffer Operation.)

• Pulse output forced cutoff signal input (Refer to 16.4.4 Pulse Output

Forced Cutoff.)

m+1

n+1

m-n

(When “L” is selected as the active level)

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