參數(shù)資料
型號(hào)： M37270MF-168SP
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(yè)數(shù)： 19/94頁(yè)
文件大?。?/td> 1551K
代理商： M37270MF-168SP
MITSUBISHI MICROCOMPUTERS
M37270MF-XXXSP
M37270EF-XXXSP, M37270EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
19
PWM OUTPUT FUNCTION
The M37270MF-XXXSP is equipped with eight 8-bit PWMs (PWM0-
–PWM7). PWM0–PWM7 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 12 shows the PWM block diagram. The PWM timing generat-
ing circuit applies individual control signals to PWM0–PWM7 using
f(X
IN
) divided by 2 as a reference signal.
(1) Data Setting
When outputting PWM0–PWM7, set 8-bit output data in the PWMi
register (i means 0 to 7; addresses 0200
16
to 0207
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
, PWM7 is also used as pins P5
0
, re-
spectively. Set the corresponding bits of the port P0 direction regis-
ter 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 13 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 13 (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 13
(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
M37270MF-XXXSP 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
M37271EF 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
M37271EFSP 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
M37271EFSS 功能描述:EPROM MCU/8BIT CMOS EMULATION CH RoHS:否 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 配件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 附件類(lèi)型:適配器板 適用于相關(guān)產(chǎn)品:RCB230，RCB231，RCB212 配用:26790D-ND - RCB BREAKOUT BOARD RS232 CABLE
M37271EF-XXXSP 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
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