FUJITSU MB91460 SERIES FR60 User Manual
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971
Chapter 50 Subclock Calibration Unit
5.Register Description
Table 5-1 32kHz : Ideal measurement results depending on measurement duration
The duration of the whole process from writing a 1 into the STRT bit until STRT is reset by
hardware is longer than the actual calibration measurement time, due to synchronization between
the different clock domains. Process Duration < (CUTD + 3)*T
osc32
.
The calibration measurement time is exact CUTD * T
osc32
.
Table 5-2 100kHz : Ideal measurement results depending on measurement duration
The duration of the whole process from writing a 1 into the STRT bit until STRT is reset by
hardware is longer than the actual calibration measurement time, due to synchronization between
the different clock domains. Process Duration < (CUTD + 3)*T
osc100
.
The calibration measurement time is exact CUTD * T
osc100
.
duration of
calibration
CUTD
value
CUTR
value
2 sec
0x0000
0x7A1200
1.75 sec
0xE000
0x6ACFC0
1.5 sec
0xC000
0x5B8D80
1.25 sec
0xA000
0x4C4B40
1 sec
0x8000
0x3D0900
0.75 sec
0x6000
0x2DC6C0
0.5 sec
0x4000
0x1E8480
0.25 sec
0x2000
0x0F4240
duration of
calibration
CUTD
value
CUTR
value
0.5 sec
0xC350
0x1E8480
0.25 sec
0x61A8
0x0F4240
0.125 sec
0x30D4
0x07A120
0.1 sec
0x2710
0x061A80