Samsung YP-P10 User Manual Page 73

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S3C2440A RISC MICROPROCESSOR PROGRAMMER'S MODEL
2-5
The THUMB State Register Set
The THUMB state register set is a subset of the ARM state set. The programmer has direct access to eight general
registers, R0-R7, as well as the Program Counter (PC), a stack pointer register (SP), a link register (LR), and the
CPSR. There are banked Stack Pointers, Link Registers and Saved Process Status Registers (SPSRs) for each
privileged mode. This is shown in Figure 2-4.
r0
r1
r2
r3
r4
r5
r6
r7
LR
SP
PC
System & User
FIQ
Supervisor IRQAbort Undefined
THUMB State General Registers and Program Counter
THUMB State Program Status Registers
CPSR CPSR
SPSR_
fiq
CPSR
SPSR_
svc
CPSR
SPSR_
abt
CPSR
SPSR_
irq
CPSR
SPSR_
und
= banked register
LR_
fiq
r0
r1
r2
r3
r4
r5
r6
r7
SP_
fiq
PC
LR_
svc
r0
r1
r2
r3
r4
r5
r6
r7
SP_
svc
PC
LR_
und
r0
r1
r2
r3
r4
r5
r6
r7
SP_
und
PC
LR_
fiq
r0
r1
r2
r3
r4
r5
r6
r7
SP_
fiq
PC
LR_
abt
r0
r1
r2
r3
r4
r5
r6
r7
SP_
abt
PC
Figure 2-4. Register Organization in THUMB state
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