Phytec phyCORE-P8xC51Mx2, Руководство по оборудованию

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phyCORE-P8xC51Mx2
34

PHYTEC MMesstechnikGmbH 2005 L-602e_3
8 Real-Time Clock RTC-8563/64 (U13)
For real-time or time-driven applications the phyCORE-P8xC51Mx2
is equipped with an RTC-8563/64 Real-Time Clock (RTC) at U13.
This RTC device provides the following features:
•
serial input/output bus (I
2
C)
•
power consumption
bus active: max. 50 mA
bus inactive, CLKOUT = 32 kHz : max. 1.7
µ
A
bus inactive, CLKOUT = 0 kHz : max. 0.75
µ
A
•
clock function with four year calendar
•
century bit for year 2000 compliance
•
universal timer with alarm and overflow indication
•
24-hour format
•
automatic word address incrementing
•
programmable alarm, timer and interrupt functions
If the phyCORE-P8xC51Mx2 is equipped with a battery, the
Real-Time Clock runs independently of the module’s power supply.
Programming of the Real-Time Clock is done via the I
2
C bus at
address 1010001(0)/0xA2, connected to port P1.6 (SCL) and port
P1.7 (SDA) on the controller. The Real-Time Clock also provides an
interrupt output which extends to port P3.2 or P3.3 via Jumper J19.
An interrupt occurs in case of a clock alarm, timer alarm, timer
overflow and event counter alarm. All interrupts must then be cleared
by software. With the interrupt function, the Real-Time Clock can be
utilized in various applications. For more information on the features
of the RTC-8563/64, refer to the corresponding Data Sheet located on
the Spectrum CD.
Note:
Following attachment of a power supply to the board, the RTC
generates no interrupts, as the RTC is not yet initialized.