Main Cr Clock Temperature Dependent Adjustment Register (Crtda) - Fujitsu 8FX Hardware Manual

8-bit microcontroller new 8fx family
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MB95630H Series
27.3.3
Main CR Clock Temperature Dependent
Adjustment Register (CRTDA)
This section describes the main CR clock temperature dependent adjustment
register (CRTDA).
■ Register Configuration
bit
7
Field
Attribute
Initial value
0
■ Register Functions
[bit7:5] Undefined bits
Their read values are always "0". Writing values to these bits has no effect on operation.
[bit4:0] CRTDA[4:0]: Main CR clock temperature dependent adjustment bits
These bits are loaded from the Flash address 0xFFBB (bit4:0) after a reset. Their initial values are determined
by the pre-load values in the NVR Flash area.
Temperature dependent adjustment maintains the accuracy of the main CR output frequency within a
temperature range. It works in combination with the coarse trimming settings in the CRTH register and the
fine trimming settings in the CRTL register. In addition, increasing the value of the CRTDA register
decreases the main the main CR clock frequency
bit4:0
Writing "00000"
:
Writing "11111"
See "27.4 Notes on Main CR Clock Trimming" and "27.5 Notes on Using NVR Interface" for details of
main CR clock trimming and notes on changing the main CR clock values respectively.
MN702-00009-2v0-E
CHAPTER 27 NON-VOLATILE REGISTER (NVR) INTERFACE
6
5
CRTDA4
R/W
0
0
Highest main CR clock frequency
Lowest main CR clock frequency
FUJITSU SEMICONDUCTOR LIMITED
4
3
CRTDA3
CRTDA2
R/W
R/W
X
X
Details
:
27.3 Registers
2
1
CRTDA1
CRTDA0
R/W
R/W
X
X
0
X
587

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