參數(shù)資料
型號: M38854F6-HP
廠商: Renesas Technology Corp.
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述: 單芯片8位CMOS微機
文件頁數(shù): 29/103頁
文件大?。?/td> 1580K
代理商: M38854F6-HP
28
3885 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
PULSE WIDTH MODULATION (PWM)
OUTPUT CIRCUIT
The 3885 group has two PWM output circuits, PWM0 and PWM1,
with 14-bit resolution respectively. These can operate indepen-
dently. When the oscillation frequency X
IN
is 8 MHz, the minimum
Fig. 23 PWM block diagram (PWM0)
resolution bit width is 250 ns and the cycle period is 4096
μ
s. The
PWM timing generator supplies a PWM control signal based on a
signal that is the frequency of the X
IN
clock.
The following explanation assumes f(X
IN
) = 8 MHz.
14
1/2
PWM
0
enable bit
P3
0
latch
P3
0
/PWM
00
PWM0L register (Address 0031
16
)
PWM0H register (Address 0030
16
)
bit 7
bit 0
bit 5
MSB
LSB
PWM
0
bit 7
bit 0
PWM0
timing
generator
(64
μ
s period)
(4096
μ
s period)
PWM0 latch (14 bits)
Set to
1
at write
Data Bus
f(X
IN
)
(8MHz)
14-bit PWM0 circuit
P5
6
direction register
PWM
0
enable bit
PWM
0
enable bit
P5
6
latch
P5
6
/DA
1
/PWM
01
PWM
0
output selection bit
P3
0
direction register
(4MHz)
PWM
0
enable bit
PWM
0
output selection bit
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