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M37151 Datasheet(PDF) 43 Page - Renesas Technology Corp

Part No. M37151
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M37151 Datasheet(HTML) 43 Page - Renesas Technology Corp

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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37151M6/M8/MA/MC/MF-XXXFP, M37151EFFP
MITSUBISHI MICROCOMPUTERS
42
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
µs (for f(XIN) = 8 MHz)
and repeat period of 1024
µs (for f(XIN) = 8 MHz).
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.


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