Information

© 2010 Microchip Technology Inc. DS70152H-page 53
dsPIC33F/PIC24H PROGRAMMING SPECIFICATION
6.2 Programming Verification
After the programming executive has been
programmed to executive memory using ICSP, it must
be verified. Verification is performed by reading out the
contents of executive memory and comparing it with
the image of the programming executive stored in the
programmer.
Reading the contents of executive memory can be
performed using the same technique described in
Section 5.8 “Reading Code Memory”. A procedure
for reading executive memory is shown in Table 6 - 2 .
Note that in Step 2, the TBLPAG register is set to 0x80,
such that executive memory may be read.
TABLE 6-2: READING EXECUTIVE MEMORY
Command
(Binary)
Data
(Hex)
Description
Step 1: Exit the Reset vector.
0000
0000
0000
040200
040200
000000
GOTO 0x200
GOTO 0x200
NOP
Step 2: Initialize TBLPAG and the read pointer (W6) for TBLRD instruction.
0000
0000
0000
200800
880190
EB0300
MOV #0x80, W0
MOV W0, TBLPAG
CLR W6
Step 3: Initialize the write pointer (W7) and store the next four locations of code memory to W0:W5.
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
EB0380
000000
BA1B96
000000
000000
BADBB6
000000
000000
BADBD6
000000
000000
BA1BB6
000000
000000
BA1B96
000000
000000
BADBB6
000000
000000
BADBD6
000000
000000
BA0BB6
000000
000000
CLR W7
NOP
TBLRDL [W6], [W7++]
NOP
NOP
TBLRDH.B [W6++], [W7++]
NOP
NOP
TBLRDH.B [++W6], [W7++]
NOP
NOP
TBLRDL [W6++], [W7++]
NOP
NOP
TBLRDL [W6], [W7++]
NOP
NOP
TBLRDH.B [W6++], [W7++]
NOP
NOP
TBLRDH.B [++W6], [W7++]
NOP
NOP
TBLRDL [W6++], [W7]
NOP
NOP