HD64F2149YV datasheet(430/1075 Pages) RENESAS

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Section 13 Timer Connection

Rev. 3.00 Jan 18, 2006 page 402 of 1044

REJ09B0280-0300

13.3.5

IVI Signal Fall Modification and IHI Synchronization

By using the timer connection TMR1, the fall of the IVI signal can be shifted backward by the

specified number of IHI signal waveforms. Also, the fall of the IVI signal can be synchronized

with the rise of the IHI signal.

To perform 8-bit timer divided waveform period measurement, TCNT in TMR1 is set to count

external clock (IHI signal) pulses, and to be cleared on the rising edge of the external reset signal

(inverse of the IVI signal). The number of IHI signal pulses until the fall of the IVI signal is

written in TCORB.

Since the IVI signal supplied to the IVO signal selection circuit is normally set on the rise of the

IVI signal and reset on the fall, its waveform is the same as that of the original IVI signal. When

fall modification is selected, a reset is performed on a TMR1 TCORB compare-match.

The fall of the waveform generated in this way can be synchronized with the rise of the IHI signal,

regardless of whether or not fall modification is selected.

Examples of TMR1 TCORB, TCR, and TCSR settings are shown in table 13.7, and the fall

modification/IHI synchronization timing chart is shown in figure 13.7.

Table 13.7

Examples of TCR, TCSR, and TCORB Settings

Bit(s)

Abbreviation

Contents

Description

7CMIEB

6CMIEA

5OVIE

Interrupts due to compare-match and

overflow are disabled

4 and 3

CCLR1,

CCLR0

TCNT is cleared by the rising edge of the

external reset signal (inverse of the IVI

signal)

TCR in

TMR1

2 to 0

CKS2 to CKS0

101

TCNT is incremented on the rising edge of

the external clock (IHI signal)

TCSR in

TMR1

3 to 0

OS3 to OS0

0011

1001

Not changed by compare-match B; output

inverted by compare-match A (toggle output)

when TCORB

≤ TCORA, 1 output on

compare-match B, 0 output on compare-

match A

TCORB in TMR1

H'03

(example)

Compare-match on the 4th (example) rise of

the IHI signal after the rise of the inverse of

the IVI signal

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