77 / 144 page
CP321
Configuration
ID 24977, Rev. 02
© 2003 Kontron Modular Computers GmbH
Page 4 - 19
4.4.4
Real-time Clock
Access to the real-time clock (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).
Legend for Table 4-22:
Table 4-22:Register Map RTC M41T56
REG.
BYTE
ADDRESS BITS
FUNCTION RANGE IN
BCD FORMAT
D7
D6
D5
D4
D3
D2
D1
D0
0
ST
10 Seconds
Seconds
Seconds: 00 - 59
1
X
10 Minutes
Minutes
Minutes: 00 - 59
2
CEB
CB
10 Hours
Hours
Century:
Hours:
0 - 1
00 - 23
3
X
XXXX
Day
Day: 00 - 07
4
X
X
10 Date
Date
Date: 01 - 31
5
X
X
X
10M.
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 neces-
sary to re-initialize the “Seconds” “Minutes” and “Hours” registers
before it will run again.
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