CHAPTER 5 iECM-86 COMMANDS

This chapter defines the iECM-86 software commands.

5.1ENTERING COMMANDS

The syntax for iECM commands is shown below:

COMMAND metasymbol

iECM-86 command definitions use one or more of the following metasymbols:

addr

 

address

iECM-86 is able to interpret the microprocessor’s address space as

 

either a flat 20-bit array or through segmentation. A location

 

anywhere within the 1 Mbyte memory range may be specified by its

 

complete physical address, such as 0F1AC9H.

segment:offset

Memory may also be accessed by segments. Valid segment

 

references are the following (where segment and offset are valid

 

integers):

 

CS:offset

 

DS:offset

 

ES:offset

 

SS:offset

 

When using CS, DS, ES or SS, the full address is calculated using the

 

actual value of the appropriate target processor segment register.

 

In addition to the above registers, iECM-86 maintains four user-

 

definable registers that may be used for segment variables:

 

CB:offset

 

DB:offset

 

EB:offset

 

SB:offset

 

This facility is useful when reading from assembler listings, which

 

are typically offset from 0000. These base registers are used, for

 

example, as a base pointer to a block of memory for debug purposes.

 

CB could be loaded with the base address of a code module, then

 

breakpoints could be set using offsets from that base. Using these

 

internal iECM registers has no effect on the values of the target

 

processor's registers.

5

5-1

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Intel 80C186EB, 80L188EC, 80L186EB, 80L186EC, 80C188EB, 80L188EB, 80C188EC, 80C186EC user manual Entering Commands
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80L188EB, 80C188EC, 80C188EB, 80L186EB, 80C186EB specifications

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