M38867E8AHP MITSUBISHI [Mitsubishi Electric Semiconductor], M38867E8AHP Datasheet - Page 32

• Manufacturer Part Number: M38867E8AHP
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER??
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

PULSE WIDTH MODULATION (PWM)
OUTPUT CIRCUIT
The 3886 group has two PWM output circuits, PWM0 and PWM1,
with 14-bit resolution respectively. These can operate indepen-
dently. When the oscillation frequency X
minimum resolution bit width is 200 ns and the cycle period is
3276.8 s. The PWM timing generator supplies a PWM control
signal based on a signal that is the frequency of the X
Fig. 29 PWM block diagram (PWM0)
32
D a t a B u s
P W M 0 l a t c h ( 1 4 b i t s )
( 8 M H z )
f ( X
M S B
b i t 7
I N
)
S e t t o “ 1 ”
a t w r i t e
( 4 M H z )
1 / 2
IN
P W M 0 H r e g i s t e r
( a d d r e s s 0 0 3 0
1 4 - b i t P W M 0 c i r c u i t
is 10 MHz, the
P W M 0
t i m i n g
g e n e r a t o r
b i t 7
IN
clock.
1 4
b i t 0
1 6
)
b i t 5
( 6 4 s p e r i o d )
( 4 0 9 6 s p e r i o d )
The following explanation assumes f(X
P W M
P W M
0
0
o u t p u t s e l e c t i o n b i t
o u t p u t s e l e c t i o n b i t
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
P W M
P W M
P W M
P W M 0 L r e g i s t e r ( a d d r e s s 0 0 3 1
0
P 5
0
e n a b l e b i t
e n a b l e b i t
6
P 3
0
d i r e c t i o n r e g i s t e r
0
b i t 0
L S B
d i r e c t i o n r e g i s t e r
MITSUBISHI MICROCOMPUTERS
P W M
P W M
P 3
P 5
0
0
0
6
e n a b l e b i t
e n a b l e b i t
l a t c h
l a t c h
IN
) = 8 MHz.
3886 Group
1 6
)
P 3
P 5
0
6
/ P W M
/ D A
1
/ P W M
0 0
0 1