376 datasheet(23/95 Pages) INTEL

23 / 95 page

376 EMBEDDED PROCESSOR

SINGLE-STEP TRAP

If the single-step flag (TF bit 8) in the EFLAG regis-

ter is found to be set at the end of an instruction a

single-step exception occurs The single-step ex-

ception is auto vectored to exception number 1

The Debug Registers are an advanced debugging

feature of the 80376 They allow data access break-

points as well as code execution breakpoints Since

the breakpoints are indicated by on-chip registers

an instruction execution breakpoint can be placed in

ROM code or in code shared by several tasks nei-

ther of which can be supported by the INT 3 break-

point opcode

The 80376 contains six Debug Registers consisting

of four breakpoint address registers and two break-

point control registers Initially after reset break-

points are in the disabled state therefore no break-

points will occur unless the debug registers are

programmed

Breakpoints set up in the Debug

Registers

are

auto-vectored

exception

Figure 26 shows the breakpoint status and control

registers

30 ARCHITECTURE

The Intel 80376 Embedded Processor has a physi-

cal address space of 16 Mbytes (224 bytes) and al-

lows the running of virtual memory programs of al-

most unlimited size (16 Kbytes c 16 Mbytes or

256 Gbytes (238 bytes)) In addition the 80376 pro-

vides a sophisticated memory management and a

hardware-assisted protection mechanism

31 Addressing Mechanism

The 80376 uses two components to form the logical

address a 16-bit selector which determines the lin-

ear base address of a segment and a 32-bit effec-

tive address The selector is used to specify an

index into an operating system defined table (see

Figure 31) The table contains the 32-bit base ad-

dress of a given segment The linear address is

formed by adding the base address obtained from

the table to the 32-bit effective address This value

is truncated to 24 bits to form the physical address

which is then placed on the address bus

240182 – 11

Figure 31 Address Calculation

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