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CPSR_c is used instead of CPSR in the MSR instruction, to avoid altering the condition code flags.
MSR - Move to Status Register from ARM* Core Register
Syntax
MSR[condition] CPSR_bit, #value
MSR[condition] CPSR_bit, source
MSR[condition] SPSR_bit, #value
MSR[condition] SPSR_bit, source
where:
condition
One of 16 conditions. Refer to Condition Code Status.
bit
valid mask bits:
c - control field mask bit[16]
x - extension field mask bit[17]
s - status field mask bit[18]
f - flags field mask bit[19]
value
8-bit immediate value
See Addressing Mode 1: Data-Processing Operands
source
source register
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