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RTCA Hour/Minute Alarm Register
Register name
Bit
RTCAALM2
15
14
13–12
11–8
7
6–4
3–0
Bit 15
Reserved
Bit 14
RTCAPA
This bit sets A.M. or P.M. of the alarm time in 12H mode (RTCACTLL.RTC24H bit = 0).
1 (R/W): P.M.
0 (R/W): A.M.
This setting is ineffective in 24H mode (RTCACTLL.RTC24H bit = 1).
Bits 13–12 RTCHHA[1:0]
Bits 11–8 RTCHLA[3:0]
The RTCAALM2.RTCHHA[1:0] bits and the RTCAALM2.RTCHLA[3:0] bits set the 10-hour
digit and 1-hour digit of the alarm time, respectively. A value within 1 to 12 o'clock in 12H
mode or 0 to 23 in 24H mode can be set in BCD code.
Bit 7
Reserved
Bits 6–4
RTCMIHA[2:0]
Bits 3–0
RTCMILA[3:0]
The RTCAALM2.RTCMIHA[2:0] bits and the RTCAALM2.RTCMILA[3:0] bits set the 10-
minute digit and 1-minute digit of the alarm time, respectively. A value within 0 to
59 minutes can be set in BCD code.
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
Bit name
Initial
–
0
RTCAPA
0
RTCHHA[1:0]
0x0
RTCHLA[3:0]
0x0
–
0
RTCMIHA[2:0]
0x0
RTCMILA[3:0]
0x0
Seiko Epson Corporation
Reset
R/W
–
R
H0
R/W
H0
R/W
H0
R/W
–
R
H0
R/W
H0
R/W
Remarks
–
10-11
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