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參數(shù)資料
| 型號： | M38869M8A-012HP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機 |
| 文件頁數(shù)： | 33/110頁 |
| 文件大?。?/td> | 1601K |
| 代理商： | M38869M8A-012HP |
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33
3886 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Data Setup (PWM0)
The PWM0 output pin also functions as port P3
0
or P5
6
. The
PWM0 output pin is selected from either P3
0
/PWM
00
or
P5
6
/PWM
01
by bit 4 of the AD/DA control register (address
0034
16
).
The PWM0 output becomes enabled state by setting bit 6 of the
port control register 1 (address 002E
16
). The high-order eight bits
of output data are set in the PWM0H register (address 0030
16
)
and the low-order six bits are set in the PWM0L register (address
0031
16
).
PWM1 is set as the same way.
PWM Operation
The 14-bit PWM data is divided into the low-order six bits and the
high-order eight bits in the PWM latch.
The high-order eight bits of data determine how long an “H”-level
signal is output during each sub-period. There are 64 sub-periods
in each period, and each sub-period is 256
τ
(64
μ
s) long. The
signal is “H” for a length equal to N times
τ
, where
τ
is the mini-
mum resolution (250 ns).
“H” or “L” of the bit in the ADD part shown in Figure 30 is added to
this “H” duration by the contents of the low-order 6-bit data accord-
ing to the rule in Table 7.
That is, only in the sub-period tm shown by Table 7 in the PWM
cycle period T = 64t, its “H” duration is lengthened to the minimum
resolution
τ
added to the length of other periods.
For example, if the high-order eight bits of the 14-bit data are 03
16
and the low-order six bits are 05
16
, the length of the “H”-level out-
put in sub-periods t
8
, t
24
, t
32
, t
40
, and t
56
is 4
τ
, and its length is 3
τ
in all other sub-periods.
Time at the “H” level of each sub-period almost becomes equal,
because the time becomes length set in the high-order 8 bits or
becomes the value plus
τ
, and this sub-period t (= 64
μ
s, approxi-
mate 15.6 kHz) becomes cycle period approximately.
Transfer From Register to Latch
Data written to the PWML register is transferred to the PWM latch
at each PWM period (every 4096
μ
s), and data written to the
PWMH register is transferred to the PWM latch at each sub-period
(every 64
μ
s). The signal which is output to the PWM output pin is
corresponding to the contents of this latch. When the PWML regis-
ter is read, the latch contents are read. However, bit 7 of the
PWML register indicates whether the transfer to the PWM latch is
completed; the transfer is completed when bit 7 is “0” and it is not
done when bit 7 is “1.”
Table 7 Relationship between low-order 6 bits of data and
period set by the ADD bit
Low-order 6 bits of data (PWML)
0 0 0 0 0 0
0 0 0 0 0 1
0 0 0 0 1 0
0 0 0 1 0 0
0 0 1 0 0 0
0 1 0 0 0 0
1 0 0 0 0 0
Sub-periods tm Lengthened (m=0 to 63)
None
m=32
m=16, 48
m=8, 24, 40, 56
m=4, 12, 20, 28, 36, 44, 52, 60
m=2, 6, 10, 14, 18, 22, 26, 30, 34, 38, 42, 46, 50, 54, 58, 62
m=1, 3, 5, 7, ................................................ ,57, 59, 61, 63
Fig. 30 PWM timing
4
0
9
6
μ
s
6
4
μ
s
6
4
μ
s
m
=
6
4
m
μ
s
=
6
4
m
μ
s
=
6
4
m
μ
s
=
m
=
0
7
9
6
3
8
1
5
.
7
5
μ
s
1
5
.
7
5
μ
s
1
5
.
7
5
μ
s
1
6
.
0
μ
s
1
5
.
7
5
μ
s
1
5
.
7
5
μ
s
1
5
.
7
5
μ
s
P
P
S
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u
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b
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6
5
.
.
0
7
μ
s
5
μ
s
:
:
:
:
0
0
0
0
1
0
1
1
1
0
1
1
1
1
m
m
=
=
8
a
,
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2
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6
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