R8CSLASH20 datasheet(254/501 Pages) RENESAS

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R8C/20 Group, R8C/21 Group

14. Timers

Rev.2.00 Aug 27, 2008

Page 238 of 458

REJ09B0250-0200

i = 0 or 1,

j = either A, B, C or D

Table 14.33

PWM3 Mode Specifications

Item

Specification

Count Sources

f1, f2, f4, f8, f32, fOCO40M

Count Operations

The TRD0 register is incremented. (The TRD1 is not used.)

PWM Waveform

PWM period: 1/fk × (m + 1)

Active level width of TRDIOA0 output: 1/fk × (m - n)

Active level width of TRDIOB0 output: 1/fk × (p - q)

fk: Frequency of count source

m: Setting value in the TRDGRA0 register

n: Setting value in the TRDGRA1 register

p: Setting value in the TRDGRB0 register

q: Setting value in the TRDGRB1 register

Count Start Condition

Write 1 (count starts) to the TSTART0 bit in the TRDSTR register.

Count Stop Conditions

• Write 0 (count stops) to the TSTART0 bit in the TRDSTR register

when the CSEL0 bit in the TRDSTR register is set to 1.

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

• When the CSEL0 bit in the TRDSTR register is set to 0, the count

stops at the compare match in the TRDGRA0 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 TRDGRji register.)

• The TRD0 register overflows

TRDIOA0, TRDIOB0 Pin

Functions

PWM output

TRDIOC0, TRDIOD0, TRDIOA1

to TRDIOD1 Pin Functions

Programmable I/O port

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 TRD0 register.

Write to Timer

The value can be written to the TRD0 register.

Selection Functions

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

Forced Cutoff)

• Select the active level every pin.

• Buffer operation (refer to 14.3.2 Buffer Operation)

m + 1

TRDIOA0 output

TRDIOB0 output

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

p - q

m - n

n + 1

p + 1

q + 1

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