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dsPIC30F Flash Programming Specification

DS70102K-page 20

2010 Microchip Technology Inc.

6.0

OTHER PROGRAMMING

FEATURES

6.1

Erasing Memory

Memory is erased by using an ERASEB, ERASED or

ERASEP command, as detailed in Section 8.5

“Command Descriptions”. Code memory can be

erased by row using ERASEP. Data EEPROM can be

erased by row using ERASED. When memory is erased,

the affected memory locations are set to ‘1’s.

ERASEB provides several Bulk Erase options.

Performing a Chip Erase with the ERASEB command

clears all code memory, data EEPROM and code

protection registers. Alternatively, ERASEB can be used

to selectively erase either all code memory or data

EEPROM. Erase options are summarized in Table 6-1.

TABLE 6-1:

ERASE OPTIONS

Command

Affected Region

ERASEB

Entire chip(1) or all code memory or all

data EEPROM, or erase by segment

ERASED

Specified rows of data EEPROM

ERASEP(2)

Specified rows of code memory

Note 1: The system operation Configuration

registers and device ID registers are not

erasable.

2: ERASEP cannot be used to erase code-

protect Configuration bits. These bits must

be erased using ERASEB.

6.2

Modifying Memory

Instead

bulk-erasing

the

device

before

programming, it is possible that you may want to modify

only a section of an already programmed device. In this

situation, Chip Erase is not a realistic option.

Instead, you can erase selective rows of code memory

and data EEPROM using ERASEP and ERASED,

respectively. You can then reprogram the modified

rows with the PROGP and PROGD command pairs. In

these cases, when code memory is programmed,

single-panel programming must be specified in the

PROGP command.

For modification of Advanced Code Protection bits for

a particular segment, the entire chip must first be

erased with the ERASEB command. Alternatively, on

devices that support Advanced Security, individual

segments (code and/or data EEPROM) may be

erased, by suitably changing the MS (Memory Select)

field in the ERASEB command. The code-protect

Configuration bits can then be reprogrammed using the

PROGC command.

Note:

If read or write code protection is enabled

for a segment, no modifications can be

made to that segment until code

protection is disabled. Code protection

can only be disabled by performing a Chip

Erase or by performing a Segment Erase

operation for the required segment.

6.3

Reading Memory

The READD command reads the data EEPROM,

Configuration bits and device ID of the device. This

command only returns 16-bit data and operates on

16-bit registers. READD can be used to return the

entire contents of data EEPROM.

The READP command reads the code memory of the

device. This command only returns 24-bit data packed

as described in Section 8.3 “Packed Data Format”.

READP can be used to read up to 32K instruction words

of code memory.

Note:

Reading an unimplemented memory

location

causes

the

programming

executive to reset. All READD and READP

commands must specify only valid

memory locations.

6.4

Programming Executive Software

Version

At times, it may be necessary to determine the version

of programming executive stored in executive memory.

The QVER command performs this function. See

Section 8.5.11 “QVER Command” for more details

about this command.

6.5

Data EEPROM Information in the

Hexadecimal File

To allow portability of code, the programmer must read

the data EEPROM information from the hexadecimal

file. If data EEPROM information is not present, a

simple warning message should be issued by the

programmer. Similarly, when saving a hexadecimal file,

all data EEPROM information must be included. An

option to not include the data EEPROM information can

be provided.

Microchip Technology Inc. believes that this feature is

important for the benefit of the end customer.

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