7
FN1547.8
October 29, 2007
Programmers Model - Clock Registers
NAME
WRITE/READ REGISTERS
HEX ADDRESS
TENS 0 TO 5
12
HR
24
X
PM/AM
TENS 0 TO 2
DB7
XX
X
TENS 0 TO 3
TENS 0 TO 1
TENS 0 TO 9
UNITS 0 TO 9
UNITS 1 TO 7
UNITS 0 TO 9
76
5
4
32
1
0
76
5
4
32
1
0
WRITE ONLY REGISTERS
TENS 0 TO 5
UNITS 0 TO 9
PM/AM
TENS 0 TO 2
XX
76
5
4
3
2
1
0
DB0
SECONDS (00 TO 59)
MINUTES (00 TO 59)
DB7, 1 = 12 HR, 0 = 24 HR
DB = 1 PM, 0 = AM
HOURS (01 TO 12 OR 00 TO 23
DATE
DAY OF MONTH
MONTH (01 TO 12) JAN = 1
DEC = 12
YEARS (00 TO 99)
CONTROL
INTERRUPT
ALARM SECONDS (00 TO 59)
ALARM MINUTES (00 TO 59)
ALARM HOURS (01 TO 12 OR 00 TO 23)
PLUS AM/PM IN 12 HR MODE
PM = 1, AM = 0
READ ONLY REGISTERS
STATUS
76
5
4
3
2
1
0
BIT
HEX ADDRESS 00-1F
20
21
22
23
24
25
26
31
32
28
29
2A
30
RAM DATA BYTE
01 TO 28
29
30
31
NOTE: X = Don’t care writes, X = 0 when read.
X
DAY OF WK (01 TO 07) SUNDAY = 1
D7
D6
D5
D4
D3
D2
D1
D0
CDP68HC68T1
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