參數(shù)資料
型號： M37274MA-052SP
廠商： Mitsubishi Electric Corporation
英文描述： PHOTO SM DETECTOR
中文描述： 單芯片8位CMOS微機(jī)隱蔽字幕解碼器和屏幕顯示控制器
文件頁數(shù)： 28/147頁
文件大小： 2042K
代理商： M37274MA-052SP
28
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37274EFSP
PRELIMINARY
Notice: This is not a final specification.
Some paramentic limits are subject to change.
MITSUBISHI MICROCOMPUTERS
(4) Operating of 14-bit PWM
As with 8-bit PWM, set the bit 0 of the PWM mode register 1 (ad-
dress 020A
16
) to “0” (at reset, bit 0 is already set to “0” automati-
cally), so that the PWM count source is supplied. Pin DA is also used
as port P0
3
. Select output mode by setting bit 3 of the port P0 direc-
tion register. Next, select the output polarity by bit 3 of the PWM
mode register 1. Then, the 14-bit PWM outputs from the D-A output
pin by setting bit 1 of the PWM mode register 1 to “0” (at reset, this bit
already set to “0” automatically) to select the DA output.
The output example of the 14-bit PWM is shown in Figure 23.
The 14-bit PWM divides the data of the DA latch into the low-order 6
bits and the high-order 8 bits.
The fundamental waveform is determined with the high-order 8-bit
data “D
H
.” A “H” level area with a length
τ
D
H
(“H” level area of
fundamental waveform) is output every short area of “t” = 256
τ
=
64
m
s (
τ
is the minimum resolution bit width of 0.25
μ
s). The “H” level
area increase interval (t
m
) is determined with the low-order 6-bit data
“D
L
.” The “H” level are of smaller intervals “t
m
” shown in Table 6 is
longer by
τ
than that of other smaller intervals in PWM repeat period
“T” = 64t. Thus, a rectangular waveform with the different “H” width is
output from the D-A pin. Accordingly, the PWM output changes by
τ
unit pulse width by changing the contents of the DA-H and DA-L
registers. A length of entirely “H” output cannot be output, i. e. 256/
256.
(5) Output after Reset
At reset, the output of ports P0
0
–P0
2
and P0
4
–P0
7
is in the high-
impedance state and the contents of the PWM register and the PWM
circuit are undefined. Note that after reset, the PWM output is unde-
fined until setting the PWM register.
PWM OUTPUT FUNCTION
The M37274EFSP is equipped with a 14-bit PWM (DA) seven 8-bit
PWMs (PWM0–PWM6). DA has a 14-bit resolution with the mini-
mum resolution bit width of 0.25 μs and a repeat period of
4096
m
s (for f(X
IN
) = 8 MHz). PWM0–PWM6 have the same circuit
structure and an 8-bit resolution with minimum resolution bit width of
4 μs and repeat period of 1024 μs (for f(X
IN
) = 8 MHz) .
Figure 22 shows the PWM block diagram. The PWM timing generat-
ing circuit applies individual control signals to PWM0–PWM6 using
f(X
IN
) divided by 2 as a reference signal.
(1) Data Setting
When outputting DA, first set the high-order 8 bits to the DA-H regis-
ter (address 0240
16
), then the low-order 6 bits to the DA-L register
(address 0241
16
). When outputting PWM0–PWM6, set 8-bit output
data to the PWMi register (i means 0 to 6; addresses 0200
16
to
0206
16
).
(2) Transmitting Data from Register to PWM circuit
Data transfer from the 8-bit PWM register to the 8-bit PWM circuit is
executed at writing data to the register.
The signal output from the 8-bit PWM output pin corresponds to the
contents of this register.
Also, data transfer from the DA register (addresses 0240
16
and
0241
16
) to the 14-bit PWM circuit is executed at writing data to the
DA-L register (address 0241
16
). Reading from the DA-H register (ad-
dress 0240
16
) means reading this transferred data. Accordingly, it is
possible to confirm the data being output from the D-A output pin by
reading the DA register.
(3) Operating of 8-bit PWM
The following explains PWM operation.
First, set the bit 0 of PWM mode register 1 (address 020A
16
) to “0”
(at reset, bit 0 is already set to “0” automatically), so that the PWM
count source is supplied.
PWM0–PWM3 are also used as pins P0
4
–P0
7
, PWM4–PWM6 are
also used as pins P0
0
–P0
2
, respectively. Set the corresponding bits
of the port P0 direction register to “1” (output mode). And select each
output polarity by bit 3 of PWM mode register 1 (address 020A
16
).
Then, set bits 7 to 0 of PWM mode register 2 to “1” (PWM output).
The PWM waveform is output from the PWM output pins by setting
these registers.
Figure 23 shows the 8-bit PWM timing. One cycle (T) is composed
of 256 (2
8
) segments. The 8 kinds of pulses, relative to the weight of
each bit (bits 0 to 7), are output inside the circuit during 1 cycle.
Refer to Figure 20 (a). The 8-bit PWM outputs waveform which is
the logical sum (OR) of pulses corresponding to the contents of bits
0 to 7 of the 8-bit PWM register. Several examples are shown in
Figure 23 (b). 256 kinds of output (HIGH area: 0/256 to 255/256) are
selected by changing the contents of the PWM register. A length of
entirely HIGH cannot be output, i.e. 256/256.
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