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PIC18F8620 Datasheet

  • PIC18F8620

  • 64/80-Pin High-Performance,256 Kbit to 1 Mbit Enhanced Flash...

  • 3273.72KB

  • 380頁(yè)

  • Microchip   Microchip

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PIC18F6520/8520/6620/8620/6720/8720
5.0
FLASH PROGRAM MEMORY
The Flash program memory is readable, writable and
erasable, during normal operation over the entire V
DD
range.
A read from program memory is executed on one byte
at a time. A write to program memory is executed on
blocks of 8 bytes at a time. Program memory is erased
in blocks of 64 bytes at a time. A bulk erase operation
may not be issued from user code.
Writing or erasing program memory will cease
instruction fetches until the operation is complete. The
program memory cannot be accessed during the write
or erase, therefore, code cannot execute. An internal
programming timer terminates program memory writes
and erases.
A value written to program memory does not need to be
a valid instruction. Executing a program memory
location that forms an invalid instruction results in a
NOP.
The program memory space is 16 bits wide, while the
data RAM space is 8 bits wide. Table reads and table
writes move data between these two memory spaces
through an 8-bit register (TABLAT).
Table read operations retrieve data from program mem-
ory and place it into the data RAM space. Figure 5-1
shows the operation of a table read with program
memory and data RAM.
Table write operations store data from the data memory
space into holding registers in program memory. The
procedure to write the contents of the holding registers
into program memory is detailed in
Section 5.5
鈥淲riting to Flash Program Memory鈥?
Figure 5-2
shows the operation of a table write with program
memory and data RAM.
Table operations work with byte entities. A table block
containing data, rather than program instructions, is not
required to be word aligned. Therefore, a table block
can start and end at any byte address. If a table write is
being used to write executable code into program
memory, program instructions will need to be word
aligned.
5.1
Table Reads and Table Writes
In order to read and write program memory, there are
two operations that allow the processor to move bytes
between the program memory space and the data
RAM:
鈥?Table Read (TBLRD)
鈥?Table Write (TBLWT)
FIGURE 5-1:
TABLE READ OPERATION
Instruction:
TBLRD*
Table Pointer
(1)
TBLPTRU
TBLPTRH
TBLPTRL
Program Memory
Table Latch (8-bit)
TABLAT
Program Memory
(TBLPTR)
Note 1:
Table Pointer points to a byte in program memory.
錚?/div>
2004 Microchip Technology Inc.
DS39609B-page 61

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