TB025 데이터 시트보기 (PDF) - Microchip Technology
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TB025 Datasheet PDF : 8 Pages
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TB025
FIGURE 1: EECON1 REGISTER
R/W-x U-0
U-0
U-0
R/W-x R/W-0 R/S-0 R/S-0
EEPGD —
—
—
WRERR WREN WR
RD
bit7
bit0
R= Readable bit
W= Writable bit
S= Settable bit
U= Unimplemented bit,
read as ‘0’
- n= Value at POR reset
bit 7:
EEPGD: Program / Data EEPROM Select bit
1 = Accesses Program memory
0 = Accesses data memory
Note: This bit cannot be changed while a write operation is in progress.
bit 6:4: Unimplemented: Read as '0'
bit 3:
WRERR: EEPROM Error Flag bit
1 = A write operation is prematurely terminated
(any MCLR reset or any WDT reset during normal operation)
0 = The write operation completed
bit 2:
WREN: EEPROM Write Enable bit
1 = Allows write cycles
0 = Inhibits write to the EEPROM
bit 1:
WR: Write Control bit
1 = initiates a write cycle.
The bit is cleared by hardware once write is complete.
The WR bit can only be set (not cleared) in software.
0 = Write cycle to the EEPROM is complete
bit 0:
RD: Read Control bit
1 = Initiates an EEPROM read (read takes one cycle)
RD is cleared in hardware. The RD bit can only be set (not cleared) in software.
0 = Does not initiate an EEPROM read
HEX FILE FORMAT
The data to be programmed into program memory will
be read into the microcontroller using one of its stan-
dard interface modules: SPI, I2C™, USART, or PSP.
Probably the simplest format to send the data to the
microcontroller is in the standard HEX format used by
the Microchip development tools. The formats sup-
ported are the Intel HEX Format (INHX8M), Intel Split
HEX Format (INHX8S), and the Intel HEX 32 Format
(INHX32). The most commonly used formats are the
INHX8M and INHX32 and therefore are the only for-
mats discussed in this document. Please refer to
Appendix A in the MPASM User's Guide (DS33014) for
more information about HEX file formats. The differ-
ence between INHX8M and INHX32 is that INHX32
supports 32-bit addresses using a linear address
record. The basic format of the hex file is the same
between both formats as shown below:
:BBAAAATTHHHH...HHHHCC
Each data record begins with a 9 character prefix and
always ends with a 2 character checksum. All records
begin with a ':' regardless of the format. The individual
elements are described below.
• BB - is a two digit hexadecimal byte count repre-
senting the number of data bytes that will appear
on the line. Divide this number by two to get the
number of words per line.
• AAAA - is a four digit hexadecimal address repre-
senting the starting address of the data record.
Format is high byte first followed by low byte. The
address is doubled because this format only sup-
ports 8-bits (to find the real PICmicro address,
simply divide the value AAAA by 2).
• TT - is a two digit record type that will be '00' for
data records, '01' for end of file records and '04'
for extended address record (INHX32 only).
• HHHH - is a four digit hexadecimal data word. For-
mat is low byte followed by high byte. There will
be BB/2 data words following TT.
• CC - is a two digit hexadecimal checksum that is
the two's complement of the sum of all the pre-
ceding bytes in the line record.
Since the PIC16F87X devices only have a maximum of
8K words, the linear address record '04' is ignored by
the routine. The HEX file is composed of ASCII char-
acters 0 thorough 9 and A to F and the end of each line
has a carriage return and linefeed. The downloader
code in the PICmicro microcontrollers must convert the
ASCII characters to binary numbers to be used for pro-
gramming.
DS91025A-page 2
© 1998 Microchip Technology Inc.
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