ARM ARM7TDMI Datasheet download pdf (Page 31)

Programmer’s Model

ARM7TDMI Data Sheet

ARM DDI 0029E

3-5

Open Access

FIQ mode has seven banked registers mapped to R8-14 (R8_ﬁq-R14_ﬁq). In ARM

state, many FIQ handlers do not need to save any registers. User, IRQ, Supervisor,

Abort and Undeﬁned each have two banked registers mapped to R13 and R14,

allowing each of these modes to have a private stack pointer and link registers.

Figure 3-3: Register organization in ARM state

ARM State General Registers and Program Counter

R10

R11

R12

R13

R14

R15 (PC)

R8_ﬁq

R9_ﬁq

R10_ﬁq

R11_ﬁq

R12_ﬁq

R13_ﬁq

R14_ﬁq

R15 (PC)

R10

R11

R12

R13_svc

R14_svc

R15 (PC)

R10

R11

R12

R13_abt

R14_abt

R15 (PC)

R10

R11

R12

R13_irq

R14_irq

R15 (PC)

R10

R11

R12

R13_und

R14_und

R15 (PC)

System & User FIQ Supervisor Abort IRQ Undeﬁned

CPSR CPSR

SPSR_ﬁq

CPSR

SPSR_svc

CPSR

SPSR_abt

CPSR

SPSR_irq

CPSR

SPSR_und

ARM State Program Status Registers

= banked register

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 41 42

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ARM ARM7TDMI Datasheet Page 31

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