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| 型號(hào)： | M37271EF-XXXSP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
| 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)： | 22/97頁 |
| 文件大?。?/td> | 1436K |
| 代理商： | M37271EF-XXXSP |
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MITSUBISHI MICROCOMPUTERS
M37271MF-XXXSP
M37271EF-XXXSP, M37271EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
22
PWM OUTPUT FUNCTION
The M37271MF-XXXSP is equipped with seven 8-bit PWMs (PWM0–
PWM6). PWM0–PWM6 have the same circuit structure and an 8-bit
resolution with minimum resolution bit width of 4
μ
s (for f(X
IN
) = 8
MHz) and repeat period of 1024
μ
s.
Figure 15 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 PWM0–PWM6, set 8-bit output data in 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 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.
(3) Operating of 8-bit PWM
The following is the explanation about PWM operation.
At 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 the PWM mode register 1 (address 020A
16
).
Then, set bits 7 to 0 of the PWM output control register 2 to “1”
(PWM output).
The PWM waveform is output from the PWM output pins by setting
these registers.
Figure 16 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 16 (a). The 8-bit PWM outputs waveform which is the logi-
cal 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 16
(b). 256 kinds of output (“H” level area: 0/256 to 255/256) are se-
lected by changing the contents of the PWM register. A length of
entirely “H” output cannot be output, i.e. 256/256.
(4) Output after Reset
At reset, the output of ports P0
0
–P0
2
and P0
4
–P0
7
is in the high-
impedance state, port P5
0
outputs “L,” and the contents of the PWM
register and the PWM circuit are undefined. Note that after reset, the
PWM output is undefined until setting the PWM register.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37271MF | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
| M37271MF-213SP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
| M37271MF-219SP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
| M37271MF-220SP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
| M37271MF-231SP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER |
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