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4551 Datasheet(PDF) 39 Page - Renesas Technology Corp

Part # 4551
Description  4-BIT SINGLE-CHIP MICROCOMPUTER
PDF  155 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

4551 Datasheet(HTML) 39 Page - Renesas Technology Corp

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FUNCTIONAL BLOCK OPERATIONS
4551 Group User’s Manual
HARDWARE
1-27
Fig. 23 Carrier wave output auto-control by timer 1
Timer 1 underflow
Port CARR output
(C20)
←0
Register C20
(C20)
←1 (C20)←0 (C20)←1
a
b
c
Set the interval
“a” to timer 1.
Set the interval “b” to
reload register R1.
Set the interval “c” to
reload register R1.
Set the interval “d” to
reload register R1.
d
Timer 1
underflow
Port CARR
output
(C20)
←1
Carrier wave output start
Timer 1 start
Carrier wave output start
“H”
“L”
“1”
“0”
“1”
“0”
“H”
“L”
“1”
“0”



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