Microchip Technology MA330031-2 Data Sheet
2011-2013 Microchip Technology Inc.
DS70000657H-page 119
dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/50X AND PIC24EPXXXGP/MC20X
5.0
FLASH PROGRAM MEMORY
The dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/
50X and PIC24EPXXXGP/MC20X 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 V
50X and PIC24EPXXXGP/MC20X 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 V
DD
range.
Flash memory can be programmed in two ways:
• In-Circuit Serial Programming™ (ICSP™)
• In-Circuit Serial Programming™ (ICSP™)
programming capability
• Run-Time Self-Programming (RTSP)
ICSP allows for a dsPIC33EPXXXGP50X,
dsPIC33EPXXXMC20X/50X and PIC24EPXXXGP/
MC20X 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
ICSP allows for a dsPIC33EPXXXGP50X,
dsPIC33EPXXXMC20X/50X and PIC24EPXXXGP/
MC20X 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 (V
three other lines for power (V
DD
), ground (V
SS
) and
Master Clear (MCLR). This allows customers to
manufacture boards with unprogrammed devices and
then program the device 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
manufacture boards with unprogrammed devices and
then program the device 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 a single
program memory word, and erase program memory in
blocks or ‘pages’ of 1024 instructions (3072 bytes) at a
time.
program memory word, and erase program memory in
blocks or ‘pages’ of 1024 instructions (3072 bytes) at a
time.
5.1
Table Instructions and Flash
Programming
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
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
The TBLRDL and the TBLWTL instructions are used to
read or write to bits<15:0> of program memory.
TBLRDL
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.
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 dsPIC33EPXXXGP50X,
dsPIC33EPXXXMC20X/50X and
PIC24EPXXXGP/MC20X families of
devices. It is not intended to be a compre-
hensive reference source. To complement
the information in this data sheet, refer to
“Flash Programming”
features of the dsPIC33EPXXXGP50X,
dsPIC33EPXXXMC20X/50X and
PIC24EPXXXGP/MC20X families of
devices. It is not intended to be a compre-
hensive reference source. To complement
the information in this data sheet, refer to
“Flash Programming”
(DS70609) in
the “dsPIC33/PIC24 Family Reference
Manual”
Manual”
, which is available from the
www.microchip.com
).
2:
Some registers and associated bits
described in this section may not be
available on all devices. Refer to
described in this section may not be
available on all devices. Refer to
in
this data sheet for device-specific register
and bit information.
and bit information.
0
Program Counter
24 Bits
Program Counter
TBLPAG Reg
8 Bits
Working Reg EA
16 Bits
Byte
24-Bit EA
0
1/0
Select
Using
Table Instruction
Table Instruction
Using
User/Configuration
Space Select
Space Select