7906 datasheet(213/531 Pages) RENESAS

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THREE-PHASE WAVEFORM MODE

7906 Group User’s Manual Rev.2.0

10-8

10.2 Block description

When a certain value is written to the dead-time timer register, this value is written to the dead-time reload

is generated due to each of timers A0 through A2, the contents of the dead-time timer reload register are

reloaded; and then, the selected count source is counted down. Simultaneously, the one-shot pulse is

output. A trigger is selected by the dead-time timer trigger select bit (bit 6 at address A616), and the count

source is selected by the clock-source-of-dead-time-timer select bits (bits 7, 6 at address A816). When an

underflow occurs, the counting becomes inactive.

Figure 10.2.5 shows the relationship between the dead-time timer’s pulse and trigger, and Table 10.2.1

lists the pulse width of the dead-time timer.

Table 10.2.1 Pulse width of dead-time timer

Fig. 10.2.5 Relationship between dead-time timer’s pulse and trigger

n: A value which is set in the dead-time timer (address A716)

fi: The dead-time timer’s clock source (f2, f2/2, f2/4)

Note: Width of pulse starting from a re-trigger occurrence timing

Edge

Rising edge of timer Ai one-shot

pulse

Falling edge of timer Ai one-shot

pulse

Rising edge of timer Ai one-shot

pulse (Re-trigger)

Falling edge of timer Ai one-shot

pulse (Re-trigger)

State at trigger input

Dead-time timer:

inactive

Dead-time timer:

active

Pulse width

n : 0016

Trigger

n : 0116 through FF16

(Note)

258 ✕

257 ✕

(n+2) ✕

(n+1) ✕

Timer Ai’s one-shot pulse

Dead-time timer’s pulse

(Reversed signal)

Timer Ai’s one-shot pulse

Dead-time timer’s pulse

(Reversed signal)

s When dead-time timer trigger select bit = “0”

Timer Ai’s one-shot pulse

s When dead-time timer trigger select bit = “1”

Internal

signal

s When re-triggering

Internal

signal

Re-trigger

Dead-time timer’s pulse

(Reversed signal)

Internal

signal

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