KU376 Просмотр технического описания (PDF) - Intel

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KU376

376™ HIGH PERFORMANCE 32-BIT EMBEDDED PROCESSOR

Intel 

376 EMBEDDED PROCESSOR

General Registers The eight 32-bit general pur-

pose registers are used to contain arithmetic and

logical operands Four of these (EAX EBX ECX and

EDX) can be used either in their entirety as 32-bit

registers as 16-bit registers or split into pairs of

separate 8-bit registers

Segment Registers Six 16-bit special purpose reg-

isters select at any given time the segments of

memory that are immediately addressable for code

stack and data

Flags and Instruction Pointer Registers These

two 32-bit special purpose registers in Figure 2 1

record or control certain aspects of the 80376 proc-

essor state The EFLAGS register includes status

and control bits that are used to reflect the outcome

of many instructions and modify the semantics of

some instructions The Instruction Pointer called

EIP is 32 bits wide The Instruction Pointer controls

instruction fetching and the processor automatically

increments it after executing an instruction

Control Register The 32-bit control register CR0

is used to control Coprocessor Emulation

System Address Registers These four special

registers reference the tables or segments support-

ed by the 80376 80386 protection model These ta-

bles or segments are

GDTR (Global Descriptor Table Register)

IDTR (Interrupt Descriptor Table Register)

LDTR (Local Descriptor Table Register)

TR (Task State Segment Register)

Debug Registers The six programmer accessible

debug registers provide on-chip support for debug-

ging The use of the debug registers is described in

Section 2 11 Debugging Support

EFLAGS REGISTER

The flag Register is a 32-bit register named

EFLAGS The defined bits and bit fields within

EFLAGS shown in Figure 2 2 control certain opera-

tions and indicate the status of the 80376 processor

The function of the flag bits is given in Table 2 1

240182 – 3

240182 – 5

Figure 2 2 Status and Control Register Bit Functions

240182 – 4

8

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