10-10
Seiko Epson Corporation
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
RTCA Control Register (High Byte)
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
RTCACTLH
7
RTCTRMBSY
0
H0
R
–
6
–
0
RTCTRM[6:0]
0x00
H0
W
Read as 0x00.
Bit 7
RTCTRMBSY
This bit indicates whether the theoretical regulation is currently executed or not.
1 (R): Theoretical regulation is executing.
0 (R): Theoretical regulation has finished (or not executed).
This bit goes 1 when a value is written to the RTCACTLH.RTCTRM[6:0] bits. The theoretical
regulation takes up to 1 second for execution. This bit reverts to 0 automatically after the
theoretical regulation has finished execution.
Bits 6
–
0
RTCTRM[6:0]
Write the correction value for adjusting the 1 Hz frequency to these bits to execute
theoretical regulation. For a calculation method of correction v
alue, refer to “Theoretical
Regulation Function.
”
Notes:
•
When the RTCACTLH.RTCTRMBSY bit = 1, the RTCACTLH.RTCTRM[6:0] bits
cannot be rewritten.
•
Writing 0x00 to the RTCACTLH.RTCTRM[6:0] bits sets the RTCACTLH.RTCTRMBSY
bit to 1 as well. However, no correcting operation is performed.
RTCA Second Alarm Register
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
RTCAALM1
15
–
0
–
R
–
14
–
12
RTCSHA[2:0]
0x0
H0
R/W
11
–
8
RTCSLA[3:0]
0x0
H0
R/W
7
–
0
–
0x00
–
R
Bit 15
Reserved
Bits 14
–
12 RTCSHA[2:0]
Bits 11
–
8 RTCSLA[3:0]
The RTCAALM1.RTCSHA[2:0] bits and the RTCAALM1.RTCSLA[3:0] bits set the 10-second
digit and 1-second digit of the alarm time, respectively. A value within 0 to 59 seconds can
be set in BCD code as shown in Table 10.6.1.
Table 10.6.1 Setting Examples in BCD Code
Setting value in BCD code
Alarm (second) setting
RTCAALM1.RTCSHA[2:0] bits
RTCAALM1.RTCSLA[3:0] bits
0x0
0x0
00 seconds
0x0
0x1
01 second
· · ·
· · ·
· · ·
0x0
0x9
09 seconds
0x1
0x0
10 seconds
· · ·
· · ·
· · ·
0x5
0x9
59 seconds
Bits 7
–
0
Reserved
Содержание S1C31D50
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