s3c2410a Samsung Semiconductor, Inc., s3c2410a Datasheet - Page 102
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s3c2410a
Manufacturer Part Number
s3c2410a
Description
16/32-bit Risc Arm Microprocessor
Manufacturer
Samsung Semiconductor, Inc.
Datasheet
1.S3C2410A.pdf
(599 pages)
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ARM INSTRUCTION SET
RESERVED BITS
Only twelve bits of the PSR are defined in ARM920T (N,Z,C,V,I,F, T & M[4:0]); the remaining bits are reserved for use
in future versions of the processor. Refer to Figure 2-6 for a full description of the PSR bits.
To ensure the maximum compatibility between ARM920T programs and future processors, the following rules should
be observed:
A read-modify-write strategy should therefore be used when altering the control bits of any PSR register; this involves
transferring the appropriate PSR register to a general register using the MRS instruction, changing only the relevant
bits and then transferring the modified value back to the PSR register using the MSR instruction.
EXAMPLES
The following sequence performs a mode change:
When the aim is simply to change the condition code flags in a PSR, a value can be written directly to the flag bits
without disturbing the control bits. The following instruction sets the N,Z,C and V flags:
MSR
No attempt should be made to write an 8-bit immediate value into the whole PSR since such an operation cannot
preserve the reserved bits.
INSTRUCTION CYCLE TIMES
PSR transfers take 1S incremental cycles, where S is defined as Sequential (S-cycle).
3-20
The reserved bits should be preserved when changing the value in a PSR.
Programs should not rely on specific values from the reserved bits when checking the PSR status, since they
may read as one or zero in future processors.
MRS
BIC
ORR
MSR
CPSR_flg,#0xF0000000
R0,CPSR
R0,R0,#0x1F
R0,R0,#new_mode
CPSR,R0
; Take a copy of the CPSR.
; Clear the mode bits.
; Select new mode
; Write back the modified CPSR.
; Set all the flags regardless of their previous state
; (does not affect any control bits).
S3C2410A
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