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| 型號： | DRM049 |
| 英文描述： | Internet Connectivity with HCS12 16-bit Microcontroller using the ACP |
| 中文描述： | 互聯(lián)網(wǎng)連接與HCS12的16位微控制器使用非加太 |
| 文件頁數(shù)： | 51/80頁 |
| 文件大?。?/td> | 1025K |
| 代理商： | DRM049 |
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Software
Software Routines
DRM040 — Rev 0
Designer Reference Manual
MOTOROLA
Software
51
3.1.14 Real Time Clock ISR
The real time clock (RTC) module provides real time clock and calendar
functions with automatic leap year adjustment. The module provides
flags (and interrupts when enabled) for seconds, minutes, hours, days,
days-of-the-week, months and years. In addition it also provides
chronological, periodic and alarm interrupts.
The RTC_ISR is entered after each second and/or minute elapses. If a
second interrupt is detected the function copies the RTC registers to the
CopyRTC RAM buffer before checking if the 5 sec display count has
timed out. If a timeout has occurred the display sequence count
(SymbolFlags) is incremented to display the next data in the predefined
sequence (T1, T2, T3, etc).
If the minute interrupt is also detected one of two possible algorithms are
executed depending on the conditional compilation. If the
TARRIF_TEST_UPDATE macro is included the tariff to be accumulated
is changed every 3mins. The sequence is as follows T1, T2, T3, T4, T1,
repeated. If the macro is not included the routine activates the tariffs
depending on the time of day and day of week. The sequence is shown
below:
T1: Monday – Friday, 08:00Hrs – 17:00Hrs
T2: Monday – Friday, 17:00Hrs – 23:00Hrs
T3: Monday – Friday, 23:00Hrs – 08:00Hrs
T4: Saturday or Sunday
The second and minute interrupt flags are cleared before exiting the ISR.
Figure 3-14
shows the RTC_ISR flow diagram
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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