Fujitsu MB91460 SERIES FR60 User Manual page 986

Chapter 50 Subclock Calibration Unit
5.Register Description
5.2 32 kHz / 100 kHz Timer Data Register (16 bit) (CUTD)
The 32kHz/100kHz Timer Data Register (CUTD) holds the value which determines the duration of calibration
(32kHz/100kHz reload value)
32/100kHz Timer Register high byte
Address : 0004B2
32/100kHz Timer Register low byte
Address : 0004B3
Default value is 0x8000 which corresponds to a measurement duration of 1 second, if a 32.768
kHz crystal is used.
This register should be written only when the calibration is inactive (STRT=0).
The 32kHz/100kHz Timer Register stores the value to specify the duration of the calibration.
When the calibration is started, the stored value is loaded into the 32kHz/100kHz Timer and the
timer starts counting down until it reaches zero.
If CUTD is initialized with 0000 an underflow will occur and the measurement will take (FFFF hex
+ 1) * T
The 32kHz/100kHz timer operates with the 32kHz or with the 100kHz oscillation clock (see
chapter
between those clocks.
In order to achieve a measurement duration of 1 second at a 32kHz oscillation, the CUTD register
has to be load with 0x8000 = 32768 dec. This number results from the exact oscillation frequency
of the crystal, which is F
MHz crystal is used) are shown in the following table.
In order to achieve a measurement duration of half a second at a 100kHz oscillation, the CUTD
register has to be load with 0xC350 = 50000 dec. This number results from the exact oscillation
frequency of the crystal, which is F
(if a 4.00 MHz crystal is used) are shown in the following table.
970
15
TDD15TDD14 TDD13 TDD12 TDD11TDD10
H
Read/write ⇒ (R/W) (R/W) (R/W) (R/W) (R/W) (R/W) (R/W) (R/W)
(1)
Default value⇒
7
TDD7 TDD6 TDD5 TDD4 TDD3 TDD2 TDD1 TDD0
H
Read/write ⇒
(R/W) (R/W) (R/W) (R/W) (R/W) (R/W) (R/W) (R/W)
(0)
Default value⇒
osc32/osc100
"4.4 CSCFG: Clock Source Configuration Register (Page
=32768 Hz. The ideal values of the measurement results (if a 4.00
osc
14 13 12 11
(0) (0) (0) (0)
6 5 4 3
(0) (0) (0) (0)
=100000 Hz. The ideal values of the measurement results
osc
⇐ Bit no.
10 9 8
TDD9 TDD8
(0) (0) (0)
⇐ Bit no.
2 1 0
(0) (0) (0)
No.196)" how to select
CUTDH
CUTDL