PIC24F04KA200 Datasheet, PDF(19/26 Page) Microchip Technology

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PIC24F04KA200 Datasheet, PDF (19/26 Pages) Microchip Technology – Flash Programming Specifications

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PIC24FXXKA2XX

3.9 Reading Configuration Memory

The procedure for reading a Configuration register is

the same as reading the code memory. The only

difference is that the 16-bit data words are read (with

the upper byte read being all â0âs) instead of the 24-bit

words. There are eight Configuration registers and they

are read, one register at a time.

Table 3-10 provides the ICSP programming details for

reading all of the Configuration registers.

Note:

The TBLPAG register should be

hard-coded to 0xF8 (the upper byte

address of the Configuration register) and

the Read Pointer, W6, is initialized to

0x00h.

TABLE 3-10: SERIAL INSTRUCTION EXECUTION FOR READING ALL THE CONFIGURATION

REGISTERS

Command

(Binary)

Data

(Hex)

Description

Step 1: Exit Reset vector.

0000

000000

040200

000000

NOP

GOTO

NOP

0x200

Step 2: Initialize TBLPAG, the Read Pointer (W6) and the Write Pointer (W7) for TBLRD instruction.

0000

200F80 MOV

880190 MOV

200007 MOV

207847 MOV

000000 NOP

#0xF8, W0

W0, TBLPAG

#0x0000,W6

#VISI, W7

Step 3: Read the Configuration register and write it to the VISI register (located at 784h), and clock out the

VISI register using the REGOUT command.

0000

0001

BA0BB6

000000

<VISI>

TBLRDL

[W6++], [W7]

NOP

Clock out contents of VISI register.

Step 4: Repeat Step 3 to read other fuses. Load W6 with their respective address.

Step 5: Reset device internal PC.

0000

040200

000000

GOTO

NOP

0x200

ï£ 2010 Microchip Technology Inc.

DS39991A-page 19

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