PIC24F04KA201 datasheet(4/26 Pages) MICROCHIP

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PIC24FXXKA2XX

DS39991A-page 4

 2010 Microchip Technology Inc.

3.0

ICSP PROGRAMMING

The ICSP method is a special programming protocol

that allows reading and writing to the PIC24FXXKA2XX

device family memory. This is accomplished by apply-

ing control codes and instructions, serially to the

device, using PGCx and PGDx pins.

In ICSP mode, the system clock is taken from the

PGCx pin, regardless of the device‘s oscillator

Configuration bits. All of the instructions are shifted

serially to an internal buffer, loaded into the Instruction

from the internal memory. Instructions are fed in 24 bits

at a time. PGDx is used to shift data in, and PGCx is

used as both the serial shift clock and the CPU

execution clock.

3.1

Overview of the Programming

Process

Figure 3-1 illustrates the high-level overview of the

programming process.

After entering the ICSP mode, perform the following:

Bulk Erase the device.

Program and verify the code memory.

Program and verify the device configuration.

Program the code-protect Configuration bits if

required.

3.2

ICSP Operation

Upon entry into ICSP mode, the CPU is Idle. An

internal state machine governs the execution of the

CPU. A 4-bit control code is clocked in, using PGCx

and PGDx, and this control code is used to command

the CPU (see Table 3-1).

The SIX control code is used to send instructions to the

CPU for execution, and the REGOUT control code is

used to read data out of the device via the VISI register.

FIGURE 3-1:

HIGH–LEVEL ICSP™

PROGRAMMING FLOW

TABLE 3-1:

CPU CONTROL CODES IN

ICSP™ MODE

Note:

During ICSP operation, the operating

frequency of PGCx should not exceed

8MHz.

4-Bit

Control Code

Mnemonic

Description

0000

SIX

Shift in 24-bit instruction

and execute.

0001

REGOUT

Shift out the VISI

(0784h) register.

0010-1111

N/A

This is reserved.

Start

Perform Bulk

Erase

Program Memory

Verify Program

End

Enter ICSP™ Mode

Program Configuration Bits

Verify Configuration Bits

Exit ICSP Mode

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