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REAL TIME CLOCK MODULE
Time Alarm register
464 Hardware Reference NS9215
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Time Alarm register
Address: 9006 0010
The Time Alarm register sets the time alarm. BCD is binary coded decimal.
Register
Register bit
assignment
13121110987654321015 14
31 29 28 27 26 25 24 23 22 21 20 19 18 17 1630
Rsvd
Rsvd
RsvdPM HR_T HR_U M_T M_U
S_T S_U H_T H_U
Bits Access Mnemonic Reset Description
D31 N/A Reserved N/A N/A
D30 R/W PM 0x0 PM
Used in 12 hour mode only.
0AM
1PM
D29:28 R/W HR_T 0x0 Hours, tens, BCD digit (0-2)
D27:24 R/W HR_U 0x0 Hours, units, BCD digit (0-9)
D23 N/A Reserved N/A N/A
D22:20 R/W M_T 0x0 Minutes, tens, BCD digit (0-5)
D19:16 R/W M_U 0x0 Minutes, units, BCD digit (0-9)
D15 N/A Reserved N/A N/A
D14:12 R/W S_T 0x0 Seconds, tens, BCD digit (0-5)
D11:08 R/W S_U 0x0 Seconds, units, BCD digit (0-9)
D07:04 R/W H_T 0x0 Hundredths of a second, tens, BCD digit (0-9)
D03:00 R/W H_U 0x0 Hundredths of a second, units, BCD digit (0-9)