SA-1100 Developer’s Manual 5-9

Coprocessors
5.2.14 Register 15 – Test, Clock, and Idle Control

Register 15 is a write-only register. The CRm and OPC_2 fields are used to encode the following

control operations. Operation for all other values of OPC_2 and CRm is unpredictable.

Function OPC_2 CRm
Enable odd-word loading of the linear feedback shift
register ( LFSR) 0b001 0b0001
Enable even-word loading of LFSR 0b001 0b0010
Clear LFSR 0b001 0b0100
Move LFSR to R14.abort 0b001 0b1000
Enable clock switching 0b010 0b0001
Disable clock switching 0b010 0b0010
RESERVED 0b010 0b0100
Wait for interrupt 0b010 0b1000