參數(shù)資料
型號: M37274EFSP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 8.1 MHz, MICROCONTROLLER, PDIP52
封裝: 0.600 INCH, 1.78 MM PITCH, PLASTIC, SDIP-52
文件頁數(shù): 75/148頁
文件大小: 1946K
代理商: M37274EFSP
31
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37274EFSP
PRELIMINARY
Notice:
This
is not
a final
specification.
Some
paramentic
limits
are
subject
to change.
MITSUBISHI MICROCOMPUTERS
Fig. 24. 14-bit PWM Output Example (f(XIN) = 8MHz)
0.25 s
b7
b0
b6 b5 b4 b3 b2 b1
0
010
11
0
b13
b6
0
101
10
b0
b5
101
000
Set “2C16” to DA-H register.
[DA-H
register]
DH
At writing of DA-L
b0
b6 b5 b4 b3 b2 b1
0
1
010
0
Set “2816” to DA-L register.
[DA-L register]
DL
At writing of DA-L
Undefined
These bits decide “H” level area of
fundamental waveform.
These bits decide smaller interval “tm” in which “H” leval
area is [“H” level area of fundamental waveform +
τ ].
=
Minimum
resolution bit
width 0.25 s
High-order 8-bit
value of DA latch
!
“H” level area of
fundamental waveform
FF
00
D3
FE FD …
……
D6
D4
02 01
D5
14-bit
PWM output
8-bit
counter
0.25 s ! 44
FF
00
D3
FE FD
D6
D4
02 01
D5
14-bit
PWM output
8-bit
counter
0.25 s ! 45
Fundamental
waveform
Waveform of smaller interval “tm” specified by low-order 6 bits
Fundamental waveform of smaller interval
“tm” which is not specified by low-order 6
bits is not changed.
14-bit PWM output
Low-order 6-bit output
of DA latch
0.25 s ! 44
τ = 0.25 s
T = 4096 s
Repeat period
t0
t1
t2
t3
t4
t5
t59
t60
t61
t62
t63
[DA latch]
b7
2C 2B 2A … 03 02 01 00
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