User`s manual

.CHK_SUM

5-68

.CHK_SUM

Name

.CHK_SUM - Generate checksum for address range

Code

$006B

Description

This routine generates a checksum for an address range

that is passed in as arguments.

Entry Conditions

R03: Beginning address

R04: Ending address + 1

R05: Scale indicator. Values are:

0 Default setting (WORD)

1 BYTE

2 HALF-WORD

4 WORD

Exit Conditions Different From Entry

R03: Checksum

Notes 1. If a Bus Error results from this routine, then the

debugger bus error exception handler is invoked and

the calling routine is also aborted.

2. The calling routine must insure that the beginning

and ending addresses are on word boundaries or the

integrity of the checksum cannot be guaranteed.