Feature Integration Technology Inc.
Fintek
F15353
INT1 register_2
MSB
LSB
W1
A2WE
0
0
0
0
W4
H4
m4
W2
H2
m2
A2HE AM/PM
H20
m20
H10
m10
H8
m8
H1
m1
A2mE
m40
In INT1 register_1 or register_2, A1WE/A2WE, A1HE/A2HE, and A1mE/A1mE are respectively in MSB of the
day of week data, hour data, and minute data by setting “1”
.
6.7 Clock Adjustment Function
A clock adjustment function is provided to logically perform slow/fast adjustment of the 32KHz clock and correct a
slow/fast clock with high accuracy. Use the clock adjustment register to set this function. Write “00h” to disable
the function. The clock adjustment register value is calculated by the following expression.
6.7.1 Current Frequency > Target Frequency
Re gister _ value*1 =
⎡
⎢
⎢
⎢
⎢
⎤
⎥
⎥
⎥
⎥
Current _ oscillatoin _ frequency
acutal _ measurement _ value*2 −T arget _ oscillation _ frquency*3
Current _ oscillation _ frequency
actual _ measurement _ value*2
128 − Integral _ value
Minimum _ resolution*4
⎢
⎥
⎣
⎦
Caution: The figure range which can be corrected is that the calculated value is from 0 to 64.
Note:
*1. The register value is the value set to the clock adjustment register. Set the binary value of this value to
the clock adjustment register.
*2. This is the measurement value of the signal
output setting is:
that is output to the INT1# or INT2# pin when the 1 Hz clock
32kE 0, INT1ME 0, INT1FE 1, INT1# register_1 is 01h (for the INT1# pin)
=
=
=
INT2ME 0, INT2FE 1, INT1# register_2 is 01h (for the INT2 pin)
=
=
*3. This is the frequency to be adjusted by using the clock adjustment function.
*4. For the minimum resolution, 3.052ppm or 1.017ppm can be set using bit7 of the clock adjustment
register. When bit7 is 0, 3.052ppm is set and logical slow/fast adjustment is performed every 20
seconds. When bit7 is 1, 1.017pm is set and logical slow/fast adjustment is performed every 60
V0.12P
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FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
