DSPIC30F2020AT-30EMM datasheet(83/286 Pages) MICROCHIP

83 / 286 page

Preliminary

DS70178C-page 81

dsPIC30F1010/202X

7.0

FLASH PROGRAM MEMORY

The dsPIC30F family of devices contains internal

program Flash memory for executing user code. There

are two methods by which the user can program this

memory:

In-Circuit Serial Programming™ (ICSP™)

programming capability

Run-Time Self-Programming (RTSP)

7.1

In-Circuit Serial Programming

(ICSP)

dsPIC30F devices can be serially programmed while in

the end application circuit. This is simply done with two

lines for Programming Clock and Programming Data

(which are named PGC and PGD respectively), and

three other lines for Power (VDD), Ground (VSS) and

Master Clear (MCLR). This allows customers to manu-

facture boards with unprogrammed devices, and then

program the microcontroller just before shipping the

product. This also allows the most recent firmware or a

custom firmware to be programmed.

7.2

Run-Time Self-Programming

(RTSP)

RTSP is accomplished using TBLRD (table read) and

TBLWT

(table write) instructions.

With RTSP, the user may erase program memory 32

instructions (96 bytes) at a time and can write program

memory data 32 instructions (96 bytes) at a time.

7.3

Table Instruction Operation Summary

The TBLRDL and the TBLWTL instructions are used to

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

TBLRDL

and TBLWTL can access program memory in

Word or Byte mode.

The TBLRDH and TBLWTH instructions are used to read

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

and TBLWTH can access program memory in Word or

Byte mode.

A 24-bit program memory address 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 7-1.

FIGURE 7-1:

ADDRESSING FOR TABLE AND NVM REGISTERS

Note: This data sheet summarizes features of this group

of dsPIC30F devices and is not intended to be a complete

reference source. For more information on the CPU,

peripherals, register descriptions and general device

functionality, refer to the “dsPIC30F Family Reference

Manual” (DS70046). For more information on the device

instruction set and programming, refer to the “dsPIC30F/

33F Programmer’s Reference Manual” (DS70157).

Program Counter

24 bits

NVMADRU Reg

8 bits

16 bits

Program

Using

TBLPAG Reg

8 bits

Working Reg EA

16 bits

Using

Byte

24-bit EA

1/0

Select

Table

Instruction

NVMADR

Addressing

Counter

Using

NVMADR Reg EA

User/Configuration

Space Select

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