R8CSLASH15 datasheet(133/277 Pages) RENESAS

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R8C/14 Group, R8C/15 Group

13. Timers

Rev.2.10

Jan 19, 2006

Page 121 of 253

REJ09B0164-0210

13.3.1

Input Capture Mode

Input capture mode is mode to input an edge to the TCIN pin or the fRING128 clock as trigger to latch

the timer value and generates an interrupt request. The TCIN input contains a digital filter and this

prevents an error caused by noise or so on from occurring. Table 13.11 shows Specification of Input

Capture Mode. Figure 13.30 shows an Operating Example in Input Capture Mode.

NOTES:

1. The digital filter delay and one count source (max.) delay are generated for the INT3 interrupt.

2. Read the TC and TM0 registers in 16-bit unit.

Table 13.11

Specification of Input Capture Mode

Item

Specification

Count Source

f1, f8, f32, fRING-fast

Count Operation

• Increment

• Transfer the value in the TC register to the TM0 register at the active edge

of measurement pulse

• The value in the TC register is set to “0000h” when the count stops

Count Start Condition

The TCC00 bit in the TCC0 register is set to “1” (count starts)

Counter Stop Condition

The TCC00 bit in the TCC0 register is set to “0” (count stops)

Interrupt Request

Generation Timing

• When the active edge of measurement pulse is input [INT3 interrupt](1)

• When Timer C overflows [Timer C interrupt]

INT3/TCIN Pin Function

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

P1_0 to P1_2, P3_3 to

P3_5 Pin Function

Programmable I/O port

Counter Value Reset

Timing

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

Read from Timer(2)

• The count value can be read out by reading the TC register.

• The count value at measurement pulse active edge input can be read out

by reading the TM0 register

Write to Timer

Write to the TC and TM0 registers is disabled

Select Function

•INT3/TCIN polarity select function

The TCC03 to TCC04 bits can select the active edge of measurement

pulse

• Digital filter function

The TCC11 to TCC10 bits can select the digital filter sampling frequency

• Trigger select function

The TCC07 bit can select the TCIN input or the fRING128

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