Phytec phyCORE-167CR, Руководство по оборудованию

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Real-Time Clock RTC-8563
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PHYTEC Meßtechnik GmbH 2002 L-527e_8
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7 The Real-Time Clock RTC-8563 (U10)
For real-time or time-driven applications, the
phyCORE-167CR/167CS is equipped with an RTC-8563
Real-Time Clock at U10. 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-167CR/167CS is equipped with a battery, the
Real-Time Clock runs independently of the board’s power supply.
Programming the Real-Time Clock is done via the I
2
C bus
(address 0 x A2 = 1010001), which is connected to port P3.4 (SCL)
and port P3.3 (SDA). The Real-Time Clock also provides an interrupt
output that extends to port P2.9 via Jumper J11. An interrupt occurs in
case of a clock alarm, timer alarm, timer overflow and event counter
alarm. An interrupt must 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, refer to the
corresponding Data Sheet.
Note:
After connection of the supply voltage, or after a reset, the Real-Time
Clock generates no interrupt. The RTC must first be initialized (see
RTC Data Sheet for more information)