Chapter 7. Real-Time Clock
59
Register C
Register: C
Address: 0Ch
Access: Read
IRQF
PF
AF
UF
0
7
6
5
4
3
2
1
0
0
0
0
Update Flag
0 No update
1 Update
Alarm Flag
0 No alarm
1 Alarm
Periodic Interrupt Flag
0 No interrupt
1 Interrupt
Interrupt Pending
0 No interrupt
1 Interrupt
Register C
Register D
Register: D
Address: 0Dh
Access: Read
VRT
0
7
6
5
4
3
2
1
0
0
0
0
0
0
0
Valid RAM
0 Invalid
1 Valid
Register D
ADDITIONAL INFORMATION
Refer to the National Semiconductor PC87303 data book for more information on the real-time clock
operating modes.
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