R8CSLASH20 datasheet(230/501 Pages) RENESAS

230 / 501 page

R8C/20 Group, R8C/21 Group

14. Timers

Rev.2.00 Aug 27, 2008

Page 214 of 458

REJ09B0250-0200

j = either A, B, C or D

Table 14.29

Reset Synchronous 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

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

PWM Waveform

PWM period:

1/fk × (m + 1)

Active level width of normal-phase: 1/fk × (m - n)

Active level width of counter-phase:1/fk × (n + 1)

fk:Frequency of count source

m:Setting value in the TRDGRA0 register

n: Setting value in the TRDGRB0 register (PWM output 1),

Setting value in the TRDGRA1 register (PWM output 2),

Setting value in the TRDGRB1 register (PWM output 3)

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 TRD0 register matches with the

content in the TRDGRj0, TRDGRA1 and TRDGRB1 registers.)

• The TRD0 register overflows

TRDIOA0 Pin Function

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

TRDIOB0 Pin Function

PWM output 1 normal-phase output

TRDIOD0 Pin Function

PWM output 1 counter-phase output

TRDIOA1 Pin Function

PWM output 2 normal-phase output

TRDIOC1 Pin Function

PWM output 2 counter-phase output

TRDIOB1 Pin Function

PWM output 3 normal-phase output

TRDIOD1 Pin Function

PWM output 3 counter-phase output

TRDIOC0 Pin Function

Output inverted every period of PWM

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

• The active level of normal-phase and counter-phase and initial

output level selected individually.

• 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

Normal-phase

n + 1

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

Counter-phase

m - n

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