MITSUBISHI MICROCOMPUTERS
M37754M8C-XXXGP, M37754M8C-XXXHP
M37754S4CGP, M37754S4CHP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
When writing data to the dead-time timer (address 1B16), the data is
In the three-phase waveform mode, setting bit 7 of the waveform out-
written to the reload register shared by three dead-time timers.
When the dead-time timers catch the start trigger from the respec-
tive timers, the reload register contents are transferred to its counter
and the dead-time timer decrements with the clock source selected
by bits 6 and 7 of pulse output data register (address 1C16). Addition-
ally, this timer can accept another trigger before completion of the
preceding trigger operation. In this case, after transferring the reload
register contents to the dead-time timer at acceptance of the trigger,
the value is decremented.
put mode register (address 1A16) to “1” makes positive waveforms
_ _ __
(U, V, W phases) and their negative waveforms (U, V, W phases)
output from the respective ports. When that bit is “0”, their ports are
____
floating. That bit is cleared to “0” by inputting falling edge to the INT0
pin or reset other than clearing by an instruction..
Additionally, setting bits 5 to 3 of the pulse output data register 1 (ad-
dress 1C16) to “1” makes the corresponding positive waveforms
fixed to “H”, and setting bits 7 to 5 of the pulse output data register 0
(address 1D16) to “1” makes the corresponding negative waveforms
The dead-time timer operates as a one-shot timer. Accordingly, this
timer starts pulse output when the trigger is caught, and finishes
pulse output and stops operation when its contents become “0016”,
and waits next trigger.
fixed to “H”.
____
When selecting the three-phase waveform mode, INT0 pin become
input-only pin.
7
6
5
4
3
2
×
1
×
0
×
7
6
5
4
3
2
×
1
0
Address
1D16
Address
1C16
Pulse output data register 1
Pulse output data register 0
V-phase output polarity set buffer
(Three-phase mode 0)
0 : “H” output
✕ : Not used in three-phase waveform mode
(Valid in three-phase mode 0)
W-phase output polarity set buffer
0 : “H” output
1 : “L” output
Interrupt request interval set bit
(Three-phase mode 1)
0 : At every second time
1 : At every fourth time
1 : “L” output
“H” output of W-phase fix buffer
0 : Released from fixed output
1 : “H” output fixed
U-phase output polarity set buffer
(Three-phase mode 0)
0 : “H” output
1 : “L” output
Interrupt validity output select bit
(Three-phase mode 1)
0 : Timer B2 interrupt request generated at each
even-numbered underflow of timer B2.
1 : Timer B2 interrupt request generated at each
odd-numbered underflow of timer B2.
“H” output of V-phase fix buffer
0 : Released from fixed output
1 : “H” output fixed
“H” output of U-phase fix buffer
0 : Released from fixed output
1 : “H” output fixed
✕ : Not used in three-phase waveform mode
Note : Only when bit 5 of the particular function select register 1 (in Fig. 15)
is set to “1”, these registers’ contents can be changed from the status
during reset (in Fig.76).
“H” output of W-phase fix buffer
0 : Released from fixed output
1 : “H” output fixed
“H” output of V-phase fix buffer
0 : Released from fixed output
1 : “H” output fixed
“H” output of U-phase fix buffer
0 : Released from fixed output
1 : “H” output fixed
Clock-source-of-dead-time timer select bits
00 : Pf
01 : Pf
10 : Pf
2
4
8
selected
selected
selected
11 : Do not select.
Fig. 44 Bit configuration of pulse output data registers 1 and 0 in three-phase waveform mode
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RENESAS [ RENESAS TECHNOLOGY CORP ]
