Philips Semiconductors
Product specification
Clock/calendar with 240 × 8-bit RAM
PCF8583
MSB
7
LSB
0
handbook, full pagewidth
memory location 04 (hours counter)
reset state: 0000 0000
6
5
4
3
2
1
unit hours BCD
ten hours (0 to 2 binary)
AM/PM flag:
0 AM
1 PM
format:
0
24 h format, AM/PM flag
remains unchanged
12 h format, AM/PM flag
will be updated
MRB002
1
Fig.5 Format of the hours counter.
MSB
7
LSB
handbook, full pagewidth
memory location 05 (year/date)
reset state: 0000 0001
6
5
4
3
2
1
0
unit days BCD
ten days (0 to 3 binary)
year (0 to 3 binary, read as 0 if
the mask flag is set)
MRB003
Fig.6 Format of the year/date counter.
MSB
7
LSB
handbook, full pagewidth
memory location 06 (weekdays/months)
reset state: 0000 0001
6
5
4
3
2
1
0
unit months BCD
ten months
weekdays (0 to 6 binary, read as 0 if
the mask flag is set)
MRB004
Fig.7 Format of the weekdays/month counter.
8
1997 Jul 15
NXP [ NXP ]
