376 datasheet(19/95 Pages) INTEL

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376 EMBEDDED PROCESSOR

Table 27 Register Values after Reset

Flag Word (EFLAGS)

uuuu0002H

(Note 1)

Machine Status Word (CR0)

uuuuuuu1H

(Note 2)

Instruction Pointer (EIP)

0000FFF0H

Code Segment (CS)

F000H

(Note 3)

Data Segment (DS)

0000H

(Note 4)

Stack Segment (SS)

0000H

Extra Segment (ES)

0000H

(Note 4)

Extra Segment (FS)

0000H

Extra Segment (GS)

0000H

EAX Register

0000H

(Note 5)

EDX Register

Component and Stepping ID

(Note 6)

All Other Registers

Undefined

(Note 7)

NOTES

1 EFLAG Register The upper 14 bits of the EFLAGS register are undefined all defined

flag bits are zero

2 CR0 The defined 4 bits in the CR0 is equal to 1H

3 The Code Segment Register (CS) will have its Base Address set to 0FFFF0000H and

Limit set to 0FFFFH

4 The Data and Extra Segment Registers (DS and ES) will have their Base Address set

to 000000000H and Limit set to 0FFFFH

5 If self-test is selected the EAX should contain a 0 value If a value of 0 is not found

the self-test has detected a flaw in the part

6 EDX register always holds component and stepping identifier

7 All unidentified bits are Intel Reserved and should not be used

29 Initialization

Because the 80376 processor starts executing in protected mode certain precautions need be taken during

initialization Before any far jumps can take place the GDT andor LDT tables need to be setup and their

respective registers loaded Before interrupts can be initialized the IDT table must be setup and the IDTR must

be loaded The example code is shown below

****************************************************************

This is an example of startup code to put either an 80376

80386SX or 80386 into flat mode

All of memory is treated as

simple linear RAM

There are no interrupt routines

The

Builder creates the GDT-alias and IDT-alias and places them

by default

in GDT 1

and GDT 2

Other entries in the GDT

are specified in the Build file

After initialization it jumps

to a C startup routine

To use this template

change this jmp

address to that of your code

or make the label of your code

‘c startup‘

This code was assembled and built using version 12 of the

Intel RLL utilities and Intel 386ASM assembler

***

This code was tested

***

****************************************************************

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