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M38B57MC Fiches technique(PDF) 50 Page - Mitsubishi Electric Semiconductor

No de pièce M38B57MC
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER????
Download  69 Pages
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Fabricant  MITSUBISHI [Mitsubishi Electric Semiconductor]
Site Internet  http://www.mitsubishichips.com
Logo MITSUBISHI - Mitsubishi Electric Semiconductor

M38B57MC Fiches technique(HTML) 50 Page - Mitsubishi Electric Semiconductor

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MITSUBISHI MICROCOMPUTERS
38B5 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
50
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Some
parametric
limits
are
subject
to change.
Fig. 56 14-bit PWM Timing
Fig. 55 Structure of PWM Control Register
P87/PWM output selection bit
0: I/O port
1: PWM output
Not used (return “0” when read)
PWM control register
(PWMCON: address 002616)
b7
b0
6A
6A
6A
6A
6A
6B
6A
6A
6A
6A
6A
6A
6A
6A
6B
6B
6B
6B
6B
6B
6B
6B
6B
6B
6B
6B
6B
5
5
5
5
5
5
5
5
5
5
5
5
5
5
6A
6A
6B
6B
6B
6A
6B
6B
6B
6A
6B
6B
6B
6A
6A
6A
6A
6A
6A
6A
6A
6A
6A
6A
6A
6A
6A
4
3
4
4
3
4
4
3
4
6B
6A
69
68
67
02
01
6A
69
68
67
02
01
02
01
00
FF
FE
FD
97
96
95
02
01
00
FC
FF
FE
FD
97
96
95
FC
ADD
ADD
165316
1A9316
1AA416
1AA416
1EE416
1EF516
T = 4096
µs
t = 64
µs
1316
A416
2416
3516
7B16
6A16
5916
Data 3516 stored at address 001516
t = 64
µs
τ = 0.25 µs
“H” period length specified by PWMH
1
2
B516
2
PWM register
(high-order)
PWM register
(low-order)
PWM latch
(14-bit)
Data 6A16 stored at address 001416
Data 2416 stored at address 001516
Bit 7 cleared after transfer
Transfer from register to latch
Data 7B16 stored at address 001416
Transfer from register to latch
When bit 7 of PWML is “0,” transfer
from register to latch is disabled.
PWM output
(Example 1)
Low-order 6-bits
output
H = 6A16
L = 2416
6B16............36 times
(107)
6A16............28 times
(106)
PWM output
(Example 2)
Low-order 6 bits
output
H = 6A16
L = 1816
6B16............24 times
6A16............40 times
PWM output
8-bit counter
The ADD portions with
additional
τ are determined
either “H” or “L” by low-order
6-bit data.
Minimum bit width
(64
64
µs)
!
106 ! 64 + 24
(256
0.25
µs)
256
(64
µs), fixed
τ
106 ! 64 + 36
!
………
………
………
………
………
.............


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