ZUD-CC-07-0221-E
January, 2008
1st Product Solution Group, Multipurpose Microcomputer Systems Division,
Microcomputer Operations Unit
NEC Electronics Corporation
© NEC Electronics Corporation 2008
78K0R/Kx3 Microcontroller
Sample Program
Operation Manual
(Watch Counter/Alarm Interrupt
(Real-Time Counter), C Source)
This software is for reference only and NEC Electronics does not guarantee its operation.
Thoroughly evaluate this software on your set prior to use.
Sample Program (Watch Counter/Alarm Interrupt (Real-Time Counter), C Source) Operation Manual (78K0R/Kx3 Microcontroller)
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ZUD-CC-07-0221-E
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Sample Program (Watch Counter/Alarm Interrupt (Real-Time Counter), C Source) Operation Manual (78K0R/Kx3 Microcontroller)
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ZUD-CC-07-0221-E
CONTENTS
1.
OVERVIEW........................................................................................................................................................................4
2. RESOURCES USED .........................................................................................................................................................5
3. SOFTWARE CONFIGURATION........................................................................................................................................6
4. FUNCTION EXPLANATIONS............................................................................................................................................7
5. FLOWCHARTS..................................................................................................................................................................9
Sample Program (Watch Counter/Alarm Interrupt (Real-Time Counter), C Source) Operation Manual (78K0R/Kx3 Microcontroller)
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ZUD-CC-07-0221-E
1. OVERVIEW
This manual explains the sample program functions of real-time counter processing for the 78K0R/Kx3.
In this sample program, years, months, weeks, days, hours, minutes, and seconds are counted by using the watch counter,
and an interrupt is generated at a specified time as an alarm function.
The operation conditions are as follows.
• 24-hour system
• RTCCL pin output (32 kHz) is disabled.
• RCLOE1 pin output (1 Hz) is disabled.
• Counts once every second (simultaneously with second count-up).
• Time is initialized to 2007/01/01/00:00:00.
• Time is rewritten to 2007/4/10 15:59:30.
• Alarm is set at 16:00 every day.
• Time is read when the alarm is detected.
