CT-161-CD Fujitsu Semiconductor America Inc, CT-161-CD Datasheet - Page 64
CT-161-CD
Manufacturer Part Number
CT-161-CD
Description
KIT 16LX FOR MB90F387
Manufacturer
Fujitsu Semiconductor America Inc
Series
F²MC-16LXr
Type
MCUr
Specifications of CT-161-CD
Contents
Board, Cable, CD
For Use With/related Products
MB90F387S
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
865-1103
Available stocks
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Manufacturer
Quantity
Price
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Part Number:
CT-161-CD
Manufacturer:
Fujitsu Semiconductor America
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135
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4.4
The following sections sequentially explain how to use the PPG timer:
Here, let's create a program to actually control the operation of the PPG timer in the
microcomputer and sound the buzzer.
4.3.1
4.3.2
To output a pulse wave based on the PPG timer, you should set the duration of L-level and
H-level signals as the counts by the PPG timer. For example, when you specify 300 as
the count of L-level duration and 500 as the count of H-level duration, the PPG outputs
the L-level signal while the PPG timer counts 300 and the H-level signal while the PPG
timer counts 500 alternately from the PPG output pin. The counting by the PPG timer is
called "PPG counting."
To output a pulse wave based on the PPG timer, you should also set the speed of PPG
counting. The PPG count per second (that is, the frequency of PPG counting) is called
the "PPG count clock."
The PPG count clock is set on the basis of the CPU clock (internal operating frequency)
of the microcomputer.
divide-by-2, divide-by-4, divide-by-8, or divide-by-16 (whole, one half, one quarter,...)
frequency of the CPU clock.
When the PPG count clock is set, the cycle of pulse set in Item 4.3.1 is determined.
How to create and execute a program to sound the buzzer
Setting of L-level and H-level duration
PPG count clock
Figure 4.6 Cycle of pulse and L-level and H-level duration
L-level duration
In details, the PPG count clock is set to the divide-by-1,
-
58
-
H-level duration
© Fujitsu
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