ST9 datasheet(122/146 Pages) STMICROELECTRONICS

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ST9 USER GUIDE

– All the other interrupt addresses must be placed in the Interrupt Segment. In “ST9” mode,

Interrupt Service Routines can make far calls to other segments.

They are organized as follows:

Table 15.

Segment 0

Table 16.

Segment n (not Interrupt Segment)

Table 17.

Interrupt Segment

The vectors above are placed at these addresses by hardware. You can place the following

ones at will, except that for each peripheral they must obey some rules like being a multiple of

a given number, e.g. 8 for the SCI.

To force the linker to effectively position these vectors from address zero, the start-up module

must first be included in the module list in the linker command file.

Address

Cause

Point to

Reset (action on the reset pin,

Watchdog reset or Software

reset).

The start of the initialisation code. The reset address is the

start-up address.

Divide by zero

Address of the routine in segment 0 that handles the case

where a division by zero has occurred.

Address

Cause

Point to

Divide by zero

Address of the routine in segment n that handles the case

where a division by zero has occurred.

Address

Cause

Point to

Divide by zero

Address of the routine in segment ISR that handles the

case where a division by zero has occurred.

Top level interrupt

The interrupt service routine for the top level interrupt.

...

Interrupt

Interrupt Service Routine addresses.

Address

Cause

Point to

First cause for the peripheral

whose IVR is set to n

The routine that handles the first interrupt cause for that pe-

ripheral.

n+2

Second cause for the periph-

eral whose IVR is set to n

The routine that handles the second interrupt cause for that

peripheral.

etc.

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