s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 34
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s3c4510b
Manufacturer Part Number
s3c4510b
Description
16/32-bit Risc Microcontroller
Manufacturer
Samsung Semiconductor, Inc.
Datasheet
1.S3C4510B.pdf
(422 pages)
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PROGRAMMER'S MODEL
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 ARM7TDMI contains a Current Program Status Register (CPSR), plus five Saved Program Status Registers
(SPSRs) for use by exception handlers. These register s functions are:
— Hold information about the most recently performed ALU operation
— Control the enabling and disabling of interrupts
— Set the processor operating mode
The arrangement of bits is shown in Figure 2-6.
2-8
31
N
Condition Code Flags
30
Z
29
C
28
V
27
.
Overflow
Carry/Borrow/Extend
Zero
Negative/Less Than
Figure 2-6. Program Status Register Format
26
.
(Reserved)
25
.
24
.
.
8
.
7
I
F
6
T
5
Control Bits
M4
4
M3
3
M2
2
Mode bits
State bit
FIQ disable
IRQ disable
M1
1
S3C4510B
M0
0
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