FUJITSU MB91460 SERIES FR60 - Manual (Page 987)

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