參數(shù)資料
型號： M37905M4C-XXXSP
廠商： Mitsubishi Electric Corporation
英文描述： 16 BIT CMOS MICROCOMPUTER
中文描述： 16位CMOS微機
文件頁數(shù)： 33/102頁
文件大?。?/td> 881K
代理商： M37905M4C-XXXSP
33
M37905M4C-XXXFP, M37905M4C-XXXSP
M37905M6C-XXXFP, M37905M6C-XXXSP
M37905M8C-XXXFP, M37905M8C-XXXSP
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
16-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
The width of the output pulse is changed by updating timer data. The
update can be performed at any time. The output pulse width is
changed at the rise of the pulse after data is written to the timer.
The contents of the reload register are transferred to the counter just
before the rise of the next pulse so that the pulse width is changed
from the next output pulse.
Undefined data is read when timer Ai is read.
The 8-bit length pulse width modulator is described next.
The 8-bit length pulse width modulator is selected when the timer Ai
mode register bit 5 is
“
1
”
.
The reload register and the counter are both divided into 8-bit
halves.
The low-order 8 bits function as a prescaler and the high-order 8 bits
function as the 8-bit length pulse width modulator. The prescaler
counts the clock selected by bits 6, 7, and the contents of the timer A
clock division select register. (See Table 7.) A pulse is generated
when the counter reaches 0000
16
as shown in Figure 34. At the
same time, the contents of the reload register is transferred to the
counter and count is continued.
Therefore, if the low-order 8 bits of the reload register are n, the pe-
riod of the generated pulse is
×
(n + 1).
The high-order 8 bits function as an 8-bit length pulse width modula-
tor using this pulse as input. The operation is the same as for 16-bit
length pulse width modulator except that the length is 8 bits. If the
high-order 8 bits of the reload register are m, the duration
“
H
”
of
pulse is
1
selected clock frequency
And the output pulse period is
(4) Pulse width modulation mode [11]
Figure 32 shows the bit configuration of the timer Ai mode register in
the pulse width modulation mode. In pulse width modulation mode,
bits 0, 1, and 2 must be set to
“
1
”
.
Bit 5 is used to determine whether to perform 16-bit length pulse
width modulator or 8-bit length pulse width modulator. 16-bit length
pulse width modulator is selected when bit 5 is
“
0
”
and 8-bit length
pulse width modulator is selected when it is
“
1
”
. The 16-bit length
pulse width modulator is described first.
The pulse width modulator can be started with a software trigger or
with an input signal from a TAi
IN
pin (external trigger).
The software trigger mode is selected when bit 4 is
“
0
”
.
Pulse width modulator is started and a pulse is output from TAi
OUT
when the count start bit is set to
“
1
”
.
The external trigger mode is selected when bit 4 is
“
1
”
.
Pulse width modulation starts when a trigger signal is input from the
TAi
IN
pin when the count start bit is
“
1
”
. Whether to trigger at the fall
or rise of the trigger signal is determined by bit 3. The trigger is at the
fall of the trigger signal when bit 3 is
“
0
”
and at the rise when it is
“
1
”
.
When data is written to timer Ai with the pulse width modulator
halted, it is written to the reload register and the counter.
Then when the count start bit is set to
“
1
”
and a software trigger or
an external trigger is issued to start modulation, the waveform shown
in Figure 33 is output continuously.
Once modulation is started, triggers are not accepted. If the value in
the reload register is m, the duration
“
H
”
of pulse is
×
m
and the output pulse period is
×
(2
16
–
1).
An interrupt request signal is generated and the interrupt request bit
in the timer Ai interrupt control register is set at each fall of the output
pulse.
1
selected clock frequency
1
selected clock frequency
Fig. 32 Bit configuration of timer Ai mode register in pulse width modulation mode
7
6
5
4
3
2
1
1
1
0
1
1 1 : Always
“
11
”
in pulse width modulation mode
1 : Always
“
1
”
in pulse width modulation mode
0
×
: Software trigger
1 0 : Trigger at the falling of TAi
IN
input
1 1 : Trigger at the rising of TAi
IN
input
0 : 16-bit pulse width modulator
1 : 8-bit pulse width modulator
Clock source select bits
(See Table 7.)
Timer A0 mode register
Timer A1 mode register
Timer A2 mode register
Timer A3 mode register
Timer A4 mode register
Address
56
16
57
16
58
16
59
16
5A
16
Timer A5 mode register
Timer A6 mode register
Timer A7 mode register
Timer A8 mode register
Timer A9 mode register
Address
D6
16
D7
16
D8
16
D9
16
DA
16
1
selected clock frequency
1
selected clock frequency
×
(n + 1)
×
m.
×
(n + 1)
×
(2
8
–
1).
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