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M38B57MC Fiches technique(PDF) 48 Page - Mitsubishi Electric Semiconductor

No de pièce M38B57MC
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER????
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Fabricant  MITSUBISHI [Mitsubishi Electric Semiconductor]
Site Internet  http://www.mitsubishichips.com
Logo MITSUBISHI - Mitsubishi Electric Semiconductor

M38B57MC Fiches technique(HTML) 48 Page - Mitsubishi Electric Semiconductor

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MITSUBISHI MICROCOMPUTERS
38B5 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
48
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Some
parametric
limits
are
subject
to change.
Pulse Width Modulation (PWM)
The 38B5 group has a PWM function with a 14-bit resolution. When
the oscillation frequency XIN is 4 MHz, the minimum resolution bit
width is 250 ns and the cycle period is 4096 µs. The PWM timing
generator supplies a PWM control signal based on a signal that is
the frequency of the XIN clock.
The explanation in the rest of this data sheet assumes XIN = 4 MHz.
14
1/2
XIN
(4MHz)
P87/PWM0
bit7
bit0
bit5
MSB
LSB
PWM
bit7
bit0
Data bus
XCIN
“1”
“0”
PWM register (high-order)
(address 001416)
PWM register (low-order)
(address 001516)
It is set to “1”
when write.
PWM latch (14-bit)
14-bit PWM circuit
When an internal
system clock
selection bit is set
to “0”
Timing
generating
unit for PWM
(64
µs cycle)
(4096
µs cycle)
P87/PWM output
selection bit
P87 direction
register
P87/PWM output
selection bit
P87 latch
Fig. 53 PWM Block Diagram


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