ARM ARM7TDMI - Instruction Register

Debug in Depth
B-8 Copyright © 2001, 2004 ARM Limited. All rights reserved. ARM DDI 0210C
B.4 Instruction register
The instruction register is 4 bits in length.
There is no parity bit.
The fixed value b0001 is loaded into the instruction register during the CAPTURE-IR
controller state.
The least significant bit of the instruction register is scanned in and scanned out first.