Fujitsu 8FX User Manual

MB95630H Series
MN702-00009-2v0-E FUJITSU SEMICONDUCTOR LIMITED 585
CHAPTER 27 NON-VOLATILE REGISTER (NVR) INTERFACE
27.3 Registers
27.3.1 Main CR Clock Trimming Register (Upper) (CRTH)
This section describes the main CR clock trimming register (upper) (CRTH).
■ 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] CRTH[4:0]: Main CR clock coarse trimming bits
The settings of these bits are loaded from the Flash address 0xFFBC (bit4:0) after a reset. Their initial values
are determined by the pre-loaded values in the NVR Flash area.
Coarse trimming modifies the main CR clock frequency with a bigger step. Increasing the coarse trimming
value decreases 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 — — — CRTH4 CRTH3 CRTH2 CRTH1 CRTH0
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