PIC24H Microchip Technology, PIC24H Datasheet - Page 65

• Manufacturer Part Number: PIC24H
• Description: Flash Programming Specification
• Manufacturer: Microchip Technology

5.9
The procedure for reading configuration memory is
similar to the procedure for reading code memory,
except that 16-bit data words are read (with the upper
byte read being all ‘0’s) instead of 24-bit words. Since
there are twelve Configuration registers, they are read
one register at a time.
TABLE 5-10:
© 2007 Microchip Technology Inc.
Step 1: Exit Reset vector.
Step 2: Initialize TBLPAG, the read pointer (W6) and the write pointer (W7) for TBLRD instruction.
Step 3: Read the Configuration register and write it to the VISI register (located at 0x784) and clock out the
Step 4: Repeat step 3 twelve times to read all the Configuration registers.
Step 5: Reset device internal PC.
Command
(Binary)
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0000
0001
0000
0000
dsPIC33F/PIC24H PROGRAMMING SPECIFICATION
Reading Configuration Memory
VISI register using the REGOUT command.
SERIAL INSTRUCTION EXECUTION FOR READING ALL CONFIGURATION MEMORY
000000
000000
040200
000000
200F80
880190
EB0300
207847
000000
BA0BB6
000000
000000
<VISI>
040200
000000
(Hex)
Data
NOP
NOP
GOTO
NOP
MOV
MOV
CLR
MOV
NOP
TBLRDL [W6++], [W7]
NOP
NOP
Clock out contents of VISI register
GOTO
NOP
0x200
#0xF8, W0
W0, TBLPAG
W6
#VISI, W7
0x200
Preliminary
Table 5-10 shows the ICSP programming details for
reading all of configuration memory. Note that the
TBLPAG register is hard coded to 0xF8 (the upper byte
address of configuration memory) and the read pointer,
W6, is initialized to 0x0000.
Description
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DS70152D-page 65