HP Vectra Technical Reference Manual page 383

Bit
2
o
Data
o
1
o
1
o
1
Definition
Store date and time in BCD (Binary Coded Decimal) (default)
Store date and time as binary integers
Places hours byte in 12 hour mode
Places hours byte in 24 hour mode (default)
Disable daylight savings (default)
Enable daylight savings
Table C.4
CMOS_RTC_REGC (CMOS Address OCH)
Bit Value
7 0
1
6 0
1
5
0
1
4 0
3-0
Table C.5
Definition
No interrupts are currently asserted
The RTC is asserting an interrupt due to either the alarm, periodic
interrupt, or update ended.
No periodic interrupt has occurred since the last read of this bit.
A periodic interrupt has occurred, read only and cleared by read.
No alarm interrupt has occurred since the last read of this bit.
An alarm interrupt has occurred, read only and cleared by read.
No update ended interrupt has occurred since the last read of the
bit.
An update ended interrupt has occurred, read only and cleared by
read.
Reserved
CMOS_RTC_REGD (CMOS Address ODH)
Bit
7
6-0
Value
o
1
Definition
Power was lost to the RTC chip since the last read of this bit.
The RTC chip has not lost power since the last read of this bit. Read
only, set to 1 after read.
Reserved
374 CMOS Memory Layout and Real-Time Clock