Fujitsu FR81S User Manual
CHAPTER 29: RTC/WDT1 CALIBRATION
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : RTC/WDT1 CALIBRATION
FUJITSU SEMICONDUCTOR CONFIDENTIAL
7
4.1. Calibration Unit Control Register 0 : CUCR0
(Calibration Unit Control Register 0)
The bit configuration of the calibration unit control register 0 is shown.
This register configures calibration start and interrupts for RTC calibration unit.
CUCR0 : Address 04B8
H
(Access: Byte, Half-word, Word)
bit15
bit14
bit13
bit12
bit11
bit10
bit9
bit8
Reserved
Initial value
1
1
1
1
1
1
1
1
Attribute R1,WX
R1,WX
R1,WX
R1,WX
R1,WX
R1,WX
R1,WX
R1,WX
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Reserved
STRT
Reserved
INT
INTEN
Initial value
0
0
0
0
0
0
0
0
Attribute R0,W0
R0,WX
R0,WX
R,W
R0,WX
R0,WX
R,W
R/W
[bit15 to bit8] Reserved
Always "1" is read. Writing to these bits does not influence other functions.
[bit7] Reserved
Be sure to write "0" to this bit.
[bit6, bit5, bit3, bit2] Reserved
Always "0" is read. Writing to these bits does not influence other functions.
[bit4] STRT (calibration STaRT) : Calibration start
This bit starts counters driven by the main clock and the sub clock. The INT bit will be set after the
comparison is completed.
STRT
Function
"0" write
Stops comparison
"1" write
Starts comparison
Setting "0" to this bit stops comparison. While comparing, writing "1" to this bit will not take effect. This
bit will be cleared to "0" after the comparison is completed.
[bit1] INT (calibration INTerrupt) : Interrupt
The INT bit will be set to "1" after the comparison is completed. If the INTEN bit is set, an interrupt will
occur. This bit is cleared by writing "0".
MB91520 Series
MN705-00010-1v0-E
1076