s3c2410a Samsung Semiconductor, Inc., s3c2410a Datasheet - Page 73
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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S3C2410A
Accessing Hi-Registers in THUMB State
In THUMB state, registers R8-R15 (the Hi registers) are not part of the standard register set. However, the assembly
language programmer has limited access to them, and can use them for fast temporary storage.
A value may be transferred from a register in the range R0-R7 (a Lo register) to a Hi register, and from a Hi register to
a Lo register, using special variants of the MOV instruction. Hi register values can also be compared against or
added to Lo register values with the CMP and ADD instructions. For more information, refer to Figure 3-34.
THE PROGRAM STATUS REGISTERS
The ARM920T contains a Current Program Status Register (CPSR), plus five Saved Program Status Registers
(SPSRs) for use by exception handlers. These register's functions are:
The arrangement of bits is shown in Figure 2-6.
Hold information about the most recently performed ALU operation
Control the enabling and disabling of interrupts
Set the processor operating mode
Condition Code Flags
31
N
30
Z
29
C
28
V
27
Overflow
Carry/Borrow/Extend
Zero
Negative/Less Than
Figure 2-6. Program Status Register Formats
26
25
(Reserved)
24
23
8
7
I
F
6
T
5
Control Bits
M4
4
M3
3
PROGRAMMER'S MODEL
M2
2
Mode bits
State bit
FIQ disable
IRQ disable
M1
1
M0
0
2-7
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