Fujitsu 8FX User Manual

MB95630H Series
MN702-00009-2v0-E FUJITSU SEMICONDUCTOR LIMITED 587
CHAPTER 27 NON-VOLATILE REGISTER (NVR) INTERFACE
27.3 Registers
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
■ 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
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.
bit 7 6 5 4 3 2 1 0
Field — — — CRTDA4 CRTDA3 CRTDA2 CRTDA1 CRTDA0
Attribute — — — R/W R/W R/W R/W R/W
Initial value 0 0 0 X X X X X
bit4:0 Details
Writing "00000" Highest main CR clock frequency
: :
Writing "11111" Lowest main CR clock frequency

Fujitsu 8FX Specifications

General

Brand	Fujitsu
Model	8FX
Category	Computer Hardware
Language	English