10-3
Seiko Epson Corporation
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
Table 10.3.2.1 lists the frequency tolerance correction rates when the theoretical regulation execution
cycle time n is 4,096 seconds as an example.
Table 10.3.2.1 Correction Rates when Theoretical Regulation Execution Cycle Time n = 4,096 Seconds
RTCACTLH.RTCTRM[6:0]
bits
(two’s
-complement)
Correction
value (decimal)
Correction rate
[ppm]
RTCACTLH.RTCTRM[6:0]
bits
(two’s
-complement)
Correction
value (decimal)
Correction rate
[ppm]
0x00
0
0.0
0x40
-64
-61.0
0x01
1
1.0
0x41
-63
-60.1
0x02
2
1.9
0x42
-62
-59.1
0x03
3
2.9
0x43
-61
-58.2
· · ·
· · ·
· · ·
· · ·
· · ·
· · ·
0x3e
62
59.1
0x7e
-2
-1.9
0x3f
63
60.1
0x7f
-1
-1.0
Minimum resolution: 1 ppm, Correction rate range: -61.0 to 60.1 ppm
Notes:
•
The theoretical regulation affects only the real-time clock counter and 1 Hz counter. It does
•
not affect the stopwatch counter.
•
After a value is written to the RTCACTLH.RTCTRM[6:0] bits, the theoretical regulation cor-
rection takes effect on the 1 Hz counter value at the same timing as when the 1 Hz counter
changes to 0x7f. Also an interrupt occurs depending on the counter value at this time.
Summary of Contents for S1C31D50
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