R8C datasheet(96/199 Pages) RENESAS

96 / 199 page

R8C/10 Group

Rev.1.20 Jan 27, 2006

page 86 of 180

REJ09B0019-0120

12.4 Timer C

Timer C is a 16-bit free-running timer. Figure 12.28 shows a block diagram of Timer C. The Timer C uses

an edge input to TCIN pin or the fRING128 clock as trigger to latch the timer count value and generates an

interrupt request. The TCIN input has a digital filter and this prevents an error caused by noise or so on

from occurring. Table 12.13 shows Timer C specifications. Figure 12.29 shows TC, TM0, TCC0, and

TCC1 registers. Figure 12.30 shows an operation example of Timer C.

Item

Specification

Count source

f1, f8, f32

Count operation

• Count up

• Transfer value in TC register to TM0 register at active edge of measurement pulse

• Value in TC register is set to “000016” when a counting stops

Count start condition

TCC00 bit in TCC0 register is set to “1” (capture enabled)

Count stop condition

TCC00 bit in TCC0 register is set to “0” (capture disabled)

Interrupt request

_____

• When active edge of measurement pulse is input [INT3 interrupt]

generation timing

• When Time C underflows [Timer C interrupt]

______

INT3/TCIN pin function

Programmable I/O or measurement pulse input

Counter value reset timing

When TCC00 bit in TCC0 register is set to “0” (capture disabled)

Read from timer(1)

• Counter value can be read out by reading TC register.

• Counter value at measurement pulse active edge input can be read out by reading TM0

Write to timer

Write to TC register and TM0 register is disabled

Select function

_____

• INT3/TCIN switching function

Measurement pulse active edge is selected by TCC03 to TCC04 bits

• Digital filter function

Digital filter sampling frequency is selected by TCC11 to TCC10 bits

• Trigger select function

TCIN input or fRING128 is selected by TCC07 bit.

NOTES:

1. TC register and TM0 register must be read in 16-bit units.

TM0 register

Upper 8 bits

Lower 8 bits

Counter

f32

Edge detection

fRING128

Timer C interrupt

TCC07=1

Transfer signal

Digital

filter

f32

TCC11 to TCC10

=012

TC register

Data bus

Upper 8 bits

Lower 8 bits

INT3/TCIN

=102

=112

TCC07=0

TCC02 to TCC01

=002

=012

=102

INT3 interrupt

TCC11 to TCC10

=002

Other than 002

TCC01, TCC02, TCC07: Bits in TCC0 register

TCC10, TCC11: Bits in TCC1 register

Sampling

clock

Table 12.13 Timer C Specifications

Figure 12.28 Timer C Block Diagram

12.4 Timer (Timer C)

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