DSPIC33F datasheet(33/80 Pages) MICROCHIP

33 / 80 page

Preliminary

DS70152D-page 33

dsPIC33F/PIC24H PROGRAMMING SPECIFICATION

3.0

DEVICE PROGRAMMING –

ENHANCED ICSP

This section discusses programming the device

through Enhanced ICSP and the programming execu-

tive. The programming executive resides in executive

memory (separate from code memory) and is executed

when Enhanced ICSP Programming mode is entered.

The programming executive provides the mechanism

for the programmer (host device) to program and verify

the dsPIC33F/PIC24H Programming Specification

family devices using a simple command set and com-

munication protocol. There are several basic functions

provided by the programming executive:

• Read Memory

• Erase Memory

• Program Memory

• Blank Check

• Read Executive Firmware Revision

The programming executive performs the low-level

tasks required for erasing, programming and verifying

a device. This allows the programmer to program the

device by issuing the appropriate commands and data.

Table 3-1 summarizes the commands. A detailed

description

for

each

command

provided

Section 4.2 “Programming Executive Commands”.

TABLE 3-1:

COMMAND SET SUMMARY

The programming executive uses the device’s data

RAM for variable storage and program execution. After

the programming executive has run, no assumptions

should be made about the contents of data RAM.

3.1

Overview of the Programming

Process

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

programming process. After entering Enhanced ICSP

mode, the programming executive is verified. Next, the

device is erased. Then, the code memory is pro-

grammed, followed by the nonvolatile device Configu-

ration

registers.

Code

memory

(including

the

Configuration registers) is then verified to ensure that

programming was successful.

After the programming executive has been verified

in memory (or loaded if not present), the dsPIC33F/

PIC24H Programming Specification can be pro-

grammed using the command set shown in Table 3-1.

FIGURE 3-1:

HIGH-LEVEL ENHANCED

ICSP™ PROGRAMMING

FLOW

Command

Description

SCHECK

Sanity check

READC

Read Configuration registers or Device

ID registers

READP

Read code memory

PROGC

Program a Configuration register and

verify

PROGP

Program one row of code memory and

verify

PROGW

Program one word of code memory

and verify

QBLANK

Query if the code memory is blank

QVER

Query the software version

Start

Done

Perform Bulk

Erase

Program Memory

Verify Program

Enter Enhanced ICSP™

Program Configuration Bits

Verify Configuration Bits

Exit Enhanced ICSP

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