m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 225

• Manufacturer Part Number: m37905
• Description: Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
• Manufacturer: Renesas Electronics Corporation.

Fig. 10.2.5 Relationship between dead-time timer’s pulse and trigger
State at trigger input
Dead-time timer:
inactive
Dead-time timer:
active
n: A value which is set in the dead-time timer (address A7
f
Note: Width of pulse starting from a re-trigger occurrence timing
THREE-PHASE WAVEFORM MODE
10.2 Block description
Table 10.2.1 Pulse width of dead-time timer
10-8
i
: The dead-time timer’s clock source (f
When a certain value is written to the dead-time timer register, this value is written to the dead-time reload
register. The M37905 has three dead-time timers, and they are independent each other. When a trigger
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 A6
source is selected by the clock-source-of-dead-time-timer select bits (bits 7, 6 at address A8
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.
Internal
signal
Internal
signal
Internal
signal
When dead-time timer trigger select bit = “0”
When dead-time timer trigger select bit = “1”
When re-triggering
Dead-time timer’s pulse
(Reversed signal)
Timer Ai’s one-shot pulse
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)
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)
Trigger
2
, f
2
7905 Group User’s Manual Rev.1.0
/2, f
2
/4)
Re-trigger
16
)
258
257
257
n : 00
16
1
1
1
f
f
f
i
i
i
(Note)
Pulse width
n : 01
(n+2)
(n+1)
(n+1)
16
16
), and the count
through FF
Re-trigger
16
). When an
1
1
1
f
f
f
i
i
i
(Note)
16