70592C datasheet(63/314 Pages) MICROCHIP

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DS70592C-page 63

PIC24HJXXXGPX06A/X08A/X10A

5.0

FLASH PROGRAM MEMORY

The PIC24HJXXXGPX06A/X08A/X10A devices con-

tain 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

programming

capability

allows

PIC24HJXXXGPX06A/X08A/X10A device to be seri-

ally programmed while in the end application circuit.

This is simply done with two lines for programming

clock and programming data (one of the alternate pro-

gramming 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 dig-

ital 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

can write program memory data either in blocks or

‘rows’ of 64 instructions (192 bytes) at a time, or single

instructions 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.

TBLRDL and TBLWTL 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. 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

of the PIC24HJXXXGPX06A/X08A/X10A

family of devices. However, it is not

intended to be a comprehensive refer-

ence source. To complement the infor-

mation in this data sheet, refer to Section

5. “Flash Programming” (DS70228) of

the “dsPIC33F/PIC24H Family Refer-

ence Manual”, which is available from the

Microchip website (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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