R8CSLASH13 datasheet(116/224 Pages) RENESAS

116 / 224 page

Rev.1.20

Jan 27, 2006

page 105 of 205

REJ09B0111-0120

R8C/13 Group

12.4 Timer (Timer C)

12.4.1 Input Capture Mode

This mode uses an edge input to TCIN pin or the fRING128 clock as trigger to latch the timer 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 specifications in input capture mode. Figure 12.33

shows an operation example of input capture mode.

Item

Specification

Count source

f1, f8, f32, fRING-fast

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” (count start)

Count stop condition

TCC00 bit in TCC0 register is set to “0” (count stop)

Interrupt request

_____

• When active edge of measurement pulse is input [INT3 interrupt](2)

generation timing

• When Timer C overflows [Timer C interrupt]

______

INT3/TCIN pin function

_______

Programmable I/O port or measurement pulse input (INT3 interrupt input)

P10 to P12, P33 to P35

Programmable I/O port

pin function

Counter value reset timing

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

Read from timer(1)

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

• Count 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 polarity select 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.

_______

2. The INT3 interrupt is acknowledged by digital filter delay and one count source cycle delay (max.)

Table 12.13 Input Capture Mode Specifications

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