2.12 Reading Configuration Registers

The procedure for reading the Configuration Words is similar to the procedure for reading code memory. Since there are multiple Configuration Words, they are read one at a time.

Table 2-9 provides the ICSP programming details for reading the Configuration Words.

Table 2-9. Serial Instruction Execution for Reading Configuration Words
Command (Binary)	Data (Hex)	Description
Step 1: Exit the Reset vector.
`0000` `0000` `0000` `0000` `0000` `0000` `0000`	`000000` `000000` `000000` `040200` `000000` `000000` `000000`	`NOP` `NOP` `NOP` `GOTO 0x200` `NOP` `NOP` `NOP`
Step 2: Initialize the TBLPAG register, the Write Pointer (W7), and the Read Pointer (W6) for the TBLRD instruction.
`0000` `0000` `0000` `0000`	`200xx0` `20FCC7` `8802A0` `2xxxx6`	`MOV #<Address23:16>, W0` `MOV #VISI, W7` `MOV W0, TBLPAG` `MOV #<Address15:0>, W6`
Step 3: Store the Configuration register and send the contents of the VISI register.
`0000` `0000` `0000` `0000` `0000` `0000` `0000` `0001` `0000` `0000` `0000` `0000` `0000` `0000` `0001`	`000000` `BA8B96` `000000` `000000` `000000` `000000` `000000` `<VISI>` `BA0B96` `000000` `000000` `000000` `000000` `000000` `<VISI>`	`NOP` `TBLRDH [W6], [W7]` `NOP` `NOP` `NOP` `NOP` `NOP` Clock out contents of the VISI register. `TBLRDL [W6], [W7]` `NOP` `NOP` `NOP` `NOP` `NOP` Clock out contents of the VISI register.
Step 4: Repeat Steps 1-3 until all Configuration registers are read.