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14.8.18 Reading coprocessor registers
14.8.19 Writing coprocessor registers
ARM DDI 0301H
ID012310
1.
Load the value into ARM register R0:
ITRSEL
INST
MRC px,y,R0,ca,cb,z
RTI
LOOP
INST 0x00000000 Ready
UNTIL Ready==1
2.
Use the standard sequence that Reading a current mode ARM register in the range R0-R14
on page 14-34 describes.
1.
Write the value onto R0, using the standard sequence. See Writing a current mode ARM
register in the range R0-R14 on page 14-34 for more details. Scan chain 5 and EXTEST
are selected.
2.
Transfer the contents of R0 to a coprocessor register:
ITRSEL
INST
MCR px,y,R0,ca,cb,z
RTI
LOOP
INST 0x00000000 Ready
UNTIL Ready==1
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; select the ITR and EXTEST
; wait until instruction ends
; select the ITR and EXTEST
; wait until instruction ends
Debug Test Access Port
14-39
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