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參數(shù)資料
| 型號(hào)： | M37150M8-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8.95 MHz, MICROCONTROLLER, PDSO42 |
| 封裝： | 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-42 |
| 文件頁(yè)數(shù)： | 82/142頁(yè) |
| 文件大小： | 1712K |
| 代理商： | M37150M8-XXXFP |
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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
MITSUBISHI MICROCOMPUTERS
M37150M6/M8/MA/MC/MF-XXXFP, M37150EFFP
43
Rev. 1.0
8.7 PWM OUTPUT FUNCTION
This microcomputer is equipped with five 8-bit PWMs (PWM0–
PWM4). PWM0–PWM4 have the same circuit structure, an 8-bit reso-
lution with minimum resolution bit width of 4
s (for f(XIN) = 8 MHz)
and repeat period of 1024
s (for f(XIN) = 8 MHz).
f(XIN): 8.95 MHz at FSCIN = 3.58 MHz
Min. resolution bit width: 4
s 8/8.95 = 3.58 s
Repeat period:1024
s 8/8.95 = 915 s
f(XIN): 8.86 MHz at FSCIN = 4.43 MHz
Min. resolution bit width: 4
s 8/8.86 = 3.61 s
Repeat period: 1024
s 8/8.86 = 925 s.
Figure 8.7.1 shows the PWM block diagram. The PWM timing gen-
erating circuit applies individual control signals to PWM0–PWM4 us-
ing f(XIN) divided by 2 as a reference signal.
8.7.1 Data Setting
When outputting PWM0–PWM4, set 8-bit output data to the PWMi
register (i means 0 to 4; addresses 020016 to 020416).
8.7.2 Transmitting Data from Register to PWM
circuit
Data transfer from the 8-bit PWM register to the 8-bit PWM circuit is
executed when writing data to the register.
The signal output from the 8-bit PWM output pin corresponds to the
contents of this register.
8.7.3 Operating of 8-bit PWM
The following explains the PWM operation.
First, set bit 0 of PWM mode register 1 (address 020816) to “0” (at
reset, bit 0 is already set to “0” automatically), so that the PWM count
source is supplied.
PWM0–PWM4 are also used as pins P00–P04. Set the correspond-
ing 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
020816). Then, set bits 4 to 0 of PWM mode register 2 (address
020916) to “1” (PWM output).
The PWM waveform is output from the PWM output pins by setting
these registers.
Figure 8.7.2 shows the 8-bit PWM timing. One cycle (T) is com-
posed of 256 (28) segments. 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 8.7.2 (a). The 8-bit PWM outputs a 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 8.7.2 (b). 256 kinds of output (HIGH area: 0/256 to 255/256)
are selected by changing the contents of the PWM register. An en-
tirely HIGH section cannot be output, i.e. 256/256.
8.7.4 Output after Reset
At reset, the output of ports P00–P04 is in the high-impedance state,
and the contents of the PWM register and the PWM circuit are unde-
fined. Note that after reset, the PWM output is undefined until setting
the PWM register.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M37150MF-XXXFP | 8-BIT, MROM, 8.95 MHz, MICROCONTROLLER, PDSO42 |
| M37150MC-XXXFP | 8-BIT, MROM, 8.95 MHz, MICROCONTROLLER, PDSO42 |
| M37151MC-XXXFP | 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDSO42 |
| M37151MF-XXXFP | 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDSO42 |
| M37151M6-XXXFP | 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDSO42 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37150MA | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37150MA-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37150MC | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37150MC-XXXFP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37150MF | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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