R8CSLASH20 datasheet(217/501 Pages) RENESAS

217 / 501 page

R8C/20 Group, R8C/21 Group

14. Timers

Rev.2.00 Aug 27, 2008

Page 201 of 458

REJ09B0250-0200

i = 0 or 1, j = either B, C or D,

h = either A, B, C or D

Table 14.27

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: Setting value in the TRDGRAi register

n: Setting value in the TRDGRji register

Count Start Condition

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

Count Stop Conditions

• Write 0 (count stops) 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 the compare

match.

Interrupt Request Generation

Timing

• Compare match (the content in the TRDi register matches with the

content in the TRDGRhi 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 (select every 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.

Selection 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 every pin.

• Initial output level selected every pin.

• Synchronous operation (refer to 14.3.3 Synchronous Operation.)

• Buffer operation (refer to 14.3.2 Buffer Operation.)

• Pulse output forced cutoff signal input (refer to 14.3.4 Pulse Output

Forced Cutoff.)

m + 1

n + 1

m - n

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

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