PIC18F4450-I/PT【PDF 190/241 页】IC PIC MCU FLASH 8KX16 44TQFP

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dsPIC30F3010/3011

DS70141F-page 52

2010 Microchip Technology Inc.

6.4

RTSP Operation

The dsPIC30F Flash program memory is organized

into rows and panels. Each row consists of 32 instruc-

tions or 96 bytes. Each panel consists of 128 rows or

4K x 24 instructions. RTSP allows the user to erase one

row (32 instructions) at a time and to program

32 instructions at one time.

Each panel of program memory contains write latches

that hold 32 instructions of programming data. Prior to

the actual programming operation, the write data must

be loaded into the panel write latches. The data to be

programmed into the panel is loaded in sequential

order into the write latches; instruction 0, instruction 1,

etc. The addresses loaded must always be from an

even group of 32 boundary.

The basic sequence for RTSP programming is to set up

a Table Pointer, then do a series of TBLWT instructions

to load the write latches. Programming is performed by

setting the special bits in the NVMCON register.

32 TBLWTL

and four

TBLWTH

instructions are

required to load the 32 instructions.

All of the table write operations are single-word writes

(2 instruction cycles), because only the table latches

are written.

After the latches are written, a programming operation

needs to be initiated to program the data.

The Flash program memory is readable, writable and

erasable during normal operation over the entire VDD

range.

6.5

RTSP Control Registers

The four SFRs used to read and write the program

Flash memory are:

NVMCON

NVMADR

NVMADRU

NVMKEY

6.5.1

NVMCON REGISTER

The NVMCON register controls which blocks are to be

erased, which memory type is to be programmed and

the start of the programming cycle.

6.5.2

NVMADR REGISTER

The NVMADR register is used to hold the lower two

bytes of the effective address. The NVMADR register

captures the EA<15:0> of the last table instruction that

has been executed and selects the row to write.

6.5.3

NVMADRU REGISTER

The NVMADRU register is used to hold the upper byte

of the effective address. The NVMADRU register

captures the EA<23:16> of the last table instruction

that has been executed.

6.5.4

NVMKEY REGISTER

NVMKEY is a write-only register that is used for write

protection. To start a programming or erase sequence,

the user must consecutively write 0x55 and 0xAA to the

NVMKEY register. Refer to Section 6.6 “Programming

Operations” for further details.

Note:

The user can also directly write to the

NVMADR and NVMADRU registers to

specify a program memory address for

erasing or programming.

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