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| 型號(hào)： | M38B57MC |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機(jī) |
| 文件頁(yè)數(shù)： | 48/69頁(yè) |
| 文件大?。?/td> | 1011K |
| 代理商： | M38B57MC |
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MITSUBISHI MICROCOMPUTERS
38B5 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
48
PRELIMINARY
Notice: This s not a final specification.
Some parametric imits are subject to change.
Pulse Width Modulation (PWM)
The 38B5 group has a PWM function with a 14-bit resolution. When
the oscillation frequency X
IN
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 X
IN
clock.
The explanation in the rest of this data sheet assumes X
IN
= 4 MHz.
14
1/2
X
IN
(4MHz)
P8
7
/PWM
0
bit7
bit0
bit5
MSB
LSB
PWM
bit7
bit0
Data bus
X
CIN
“1”
“0”
PWM register (high-order)
(address 0014
16
)
PWM register (low-order)
(address 0015
16
)
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
μ
s cycle)
(4096
μ
s cycle)
P8
7
/PWM output
selection bit
P8
7
direction
register
P8
7
/PWM output
selection bit
P8
7
latch
Fig. 53 PWM Block Diagram
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