VMP2 Configuration
ID 24855, Rev. 02Page 4 - 20 © 2002 PEP Modular Computers GmbH
4.3.6 Real-time Clock
Access to the RTC is effected via the I2C bus. The RTC uses address 0xD0
For more detailed information please refer to the manuals for the
ST - Microelectronics M41T56 and the Motorola MPC 8245 (I2C - Bus).
Meanings of abbreviations in Table 4-24
Table 4-22: Register Map RTC M41T56
Address D7 D6 D5 D4 D3 D2 D1 D0
Function/Range
in BCD Format
0 ST 10 Seconds Seconds Seconds / 00-59
1 X 10 Minutes Minutes Minutes / 00-59
2 CEB CB 10 Hours Hours
Century 0-1/Hour
00-23
3 X X X X X Day Day / 00-07
4 X X 10 Date Date Date / 01-31
5XXX
10
M.
Month Month / 01-12
6 10 Years Years Year / 00-99
7 OUT FT S Calibraton Control
CEB = Century enable bit
CB = Century bit
FT = Frequency test bit
OUT = Output level
ST = Stop bit
S = Sign bit
Note:
When the RTC has once been stopped due to low voltage, it is
necessary to re-initialize the “Seconds” “Minutes” and “Hours” reg-
isters before it will run again.
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