CT-161-CD Fujitsu Semiconductor America Inc, CT-161-CD Datasheet - Page 76

• 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

6.2
Figure 6-2 shows the LED blinking processing with using the timer.
To use the timer to count the LED-on and -off time, the count clock and the number of the
counts need to be specified. The LED-on and -off time can be calculated by using the
following expression. Using the timer, as just described, has the advantage of enabling the
accurate time count.
This section explains how to create a program to control the LED blinking by using a timer
interrupt. The 16-bit reload timer is used for the timer of this program.
In this section, a program that uses the 16-bit reload timer interrupt to count the LED blinking
time is created. The LED operation of this program is the same as that of the program
created in Chapter 2. However, as the operation of the microcomputer, the 16-bit reload
timer instead of the CPU is used for counting the LED-on and -off time. The CPU is not
6.2.1
How to create and execute a program to control the LED blinking by using a timer
interrupt
LED-on and -off time period = count clock cycle × number of counts
In Chapter 2, the LED blinking time is controlled by a WAIT of the loop processing.
CPU processing
Outline of the program to be created
Timer
Count clock cycle
Figure 6-2 LED blinking processing with using the timer
Timer interrupt factor
Number of counts
Timer counter
ON/OFF switching
Interrupt processing
Count not required
LED-on
-
70
Cleared by software
-
ON/OFF switching
Interrupt processing
Count not required
LED-off
Cleared by software
ON/OFF switching
Interrupt processing
Count not required
LED-on
Cleared by
software
LED-off
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