DSPIC33FJ32MC302EMM datasheet(73/460 Pages) MICROCHIP

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DS70291G-page 73

dsPIC33FJ32MC302/304, dsPIC33FJ64MCX02/X04 AND dsPIC33FJ128MCX02/X04

5.0

FLASH PROGRAM MEMORY

The dsPIC33FJ32MC302/304, dsPIC33FJ64MCX02/

X04 and dsPIC33FJ128MCX02/X04 devices contain

internal Flash program memory for storing and

executing application code. The memory is readable,

writable and erasable during normal operation over the

entire VDD range.

Flash memory can be programmed in two ways:

• In-Circuit Serial Programming™ (ICSP™)

programming capability

• Run-Time Self-Programming (RTSP)

ICSP

allows

dsPIC33FJ32MC302/304,

dsPIC33FJ64MCX02/X04 and dsPIC33FJ128MCX02/

X04 device to be serially programmed while in the end

application circuit. This is done with two lines for

programming clock and programming data (one of the

alternate programming pin pairs: PGECx/PGEDx), and

three other lines for power (VDD), ground (VSS) and

Master Clear (MCLR). This allows customers to

manufacture boards with unprogrammed devices and

then program the digital signal controller just before

shipping the product. This also allows the most recent

firmware or a custom firmware to be programmed.

RTSP is accomplished using TBLRD (table read) and

TBLWT (table write) instructions. With RTSP, the user

application can write program memory data either in

blocks or rows of 64 instructions (192 bytes) at a time

or a single program memory word, and erase program

memory in blocks or pages of 512 instructions (1536

bytes) at a time.

5.1

Table Instructions and Flash

Programming

Regardless of the method used, all programming of

Flash memory is done with the table read and table

write instructions. These allow direct read and write

access to the program memory space from the data

memory while the device is in normal operating mode.

The 24-bit target address in the program memory is

formed using bits <7:0> of the TBLPAG register and the

Effective Address (EA) from a W register specified in

the table instruction, as shown in Figure 5-1.

The TBLRDL and the TBLWTL instructions are used to

read or write to bits <15:0> of program memory. The

TBLRDL and TBLWTL instructions can access program

memory in both Word and Byte modes.

The TBLRDH and TBLWTH instructions are used to read

or write to bits <23:16> of program memory. The

TBLRDH and TBLWTH can also access program

memory in Word or Byte mode.

FIGURE 5-1:

ADDRESSING FOR TABLE REGISTERS

Note 1: This data sheet summarizes the features

the

dsPIC33FJ32MC302/304,

dsPIC33FJ64MCX02/X04

and

dsPIC33FJ128MCX02/X04

family

devices. It is not intended to be a

comprehensive reference source. To

complement the information in this data

sheet, refer to Section 5. “Flash

Programming”

(DS70191)

the

“dsPIC33F/PIC24H Family Reference

Manual”, which is available from the

Microchip

web

site

(www.microchip.com).

2: Some registers and associated bits

described in this section may not be

available on all devices. Refer to

Section 4.0 “Memory Organization” in

this data sheet for device-specific register

and bit information.

Program Counter

24 bits

Program Counter

TBLPAG Reg

8 bits

Working Reg EA

16 bits

Byte

24-bit EA

1/0

Select

Using

Table Instruction

Using

User/Configuration

Space Select

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