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參數(shù)資料
| 型號(hào)： | M37754S4CHP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 16BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片16位微機(jī)的CMOS |
| 文件頁(yè)數(shù)： | 39/114頁(yè) |
| 文件大?。?/td> | 1116K |
| 代理商： | M37754S4CHP |
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39
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
MITSUBISHI MICROCOMPUTERS
M37754M8C-XXXGP, M37754M8C-XXXHP
M37754S4CGP, M37754S4CHP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Three-phase mode 0
In selecting three-phase waveform mode, three-phase mode 0 is se-
lected by setting bit 4 of the waveform output mode register (address
1A
16
) to “0”.
The output polarity of three-phase waveform depends on the output
polarity set toggle flip-flop. The positive waveform of the three-phase
waveform is “H” output when the toggle flip-flop is “0”; it is “L” output
when the toggle flip-flop is “1”. (Three-phase waveform is output as
a negative waveform.)
Each output polarity set toggle flip-flop has the output polarity set
buffer shown in Figure 44. When the timer B2’s counter contents be-
come 0000
16
, the contents of output polarity set buffer are set into
the output polarity set toggle flip-flop. After that, the polarity of the
contents of output polarity set toggle flip-flop are reversed each time
completion of one-shot pulse of timer (timers A2 to A0) correspond-
ing to each phase.
Figure 45 shows an example of U-phase waveform and the output
operation is explained. Three-phase mode 0 becomes valid when
writing “0” to the U-phase output polarity set buffer (bit 1 at address
1C
16
) and actuating the timer B2. When the counter of timer B2 be-
comes 0000
16
, the timer B2 interrupt request signal occurs and the
timer A2 simultaneously starts one-shot pulse output. At this time,
the contents of U-phase output polarity set buffer, “0” in this case, are
set into the output polarity set toggle flip-flop 2.
When the one-shot pulse output of timer A2 is completed, the con-
tents of output polarity set toggle flip-flop 2 is reversed from “0” to “1”.
Simultaneously, the one-shot pulse of the 8-bit dead-time timer is
output for ensuring time not to overlap “L” levels of U phase wave-
form and its negative U phase waveform.
The U-phase waveform output keeps “H” level from the start until the
one-shot pulse output of the dead-time timer is completed, even if
the contents of output polarity set toggle flip-flop 2 are reversed from
“0” to “1” owing to the timer A2’s one-shot pulse output. When the
one-shot pulse output of the dead-time timer is completed, “1” of
output polarity set toggle flip-flop 2 which has been reversed be-
comes valid and the U phase waveform changes to “L” level.
Signal output each time
Timer B2 becomes 0000
16
One-shot pulse output
with timer A2
Contents of output polarity
set toggle flip-flop 2
Reversed pulse output
signal with dead-time timer
U-phase waveform output
U-phase waveform output
Then, write “1” to the U-phase output polarity set buffer (bit 1 at ad-
dress 1C
16
) before the counter of timer B2 becomes 0000
16
.
After that, when the counter of timer B2 becomes 0000
16
, the
timer A2 starts one-shot pulse output. Simultaneously, the con-
tents of U-phase output polarity set buffer, “1” in this case, are set
into the output polarity set toggle flip-flop 2 and the U phase wave-
form remains “L” level.
When the one-shot pulse output of timer A2 is completed, the con-
tents of output polarity set toggle flip-flop 2 is reversed from “1” to
“0”. Simultaneously, the one-shot pulse output of the dead-time
timer starts.
When the contents of output polarity set toggle flip-flop 2 are re-
versed from “1” to “0”, the U-phase waveform changes its output
level from “L” to “H” without waiting for completion of the one-shot
pulse output of the dead-time timer.
U-phase waveform is generated by repeating the operation
above. The way to generate U-phase waveform, which is the
negative phase of U-phase, is the same as that for U-phase wave-
form except that the contents of output polarity set toggle flip-flop
2 are treated as the reversed signal from the case of U-phase
waveform.
In this way, U-phase waveform and U-phase waveform, having
the negative phase of U-phase, are output from the pins so that
their “L” levels do not overlap each other. The width of “L” level can
be also modified by changing the value of timer B2 or timer A2.
V-, W-phase waveform and V-, W-phase waveform, having their
negative phase, are similarly output according to the correspond-
ing timer operation.
The explanation above is an example of three-phase waveform
generating due to an triangular wave modulation. Three-phase
waveform due to a saw-tooth-wave modulation can also be gen-
erated by fixing each beginning level of phases.
Fig. 45 U-phase waveform output example in three-phase mode 0 (triangular wave modulation)
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