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M38B71M1 Datasheet(PDF) 63 Page - Renesas Technology Corp

Part No. M38B71M1
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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Maker  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
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M38B71M1 Datasheet(HTML) 63 Page - Renesas Technology Corp

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38B7 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
62
14
1/2
XIN
(4MHz)
P96/PWM0
bit7
bit0
bit5
MSB
LSB
PWM
bit7
bit0
Data bus
XCIN
“1”
“0”
PWM register (high-order)
(address 003516)
PWM register (low-order)
(address 003616)
It is set to “1”
when write.
PWM latch (14-bit)
14-bit PWM circuit
When the internal
system clock
selection bit is set
to “0”
Timing
generating
unit for PWM
(64
µs cycle)
(4096
µs cycle)
P96/PWM output
selection bit
P96 direction
register
P96/PWM output
selection bit
P96 latch
PWM (Pulse Width Modulation)
The 38B7 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 assumes XIN = 4 MHz.
Fig. 64 PWM block diagram


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