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FUJITSU MB91460 SERIES FR60 User Manual

Page 987

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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