参数资料
型号: PIC16F676-E/SL
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO14
封装: 3.90 MM, LEAD FREE, PLASTIC, SOIC-14
文件页数: 83/132页
文件大小: 1344K
代理商: PIC16F676-E/SL
PIC16F630/676
DS40039F-page 54
2010 Microchip Technology Inc.
8.7
DATA EEPROM OPERATION
DURING CODE-PROTECT
Data memory can be code-protected by programming
the CPD bit to ‘0’.
When the data memory is code-protected, the CPU is
able to read and write data to the data EEPROM. It is
recommended to code-protect the program memory
when code protecting data memory. This prevents
anyone from programming zeroes over the existing
code (which will execute as NOPs) to reach an added
routine, programmed in unused program memory,
which outputs the contents of data memory.
Programming unused locations to ‘0’ will also help
prevent data memory code protection from becoming
breached.
TABLE 8-1:
REGISTERS/BITS ASSOCIATED WITH DATA EEPROM
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR, BOD
Value on all
other
Resets
0Ch
PIR1
EEIF
ADIF
CMIF
TMR1IF 00-- 0--0 00-- 0--0
9Ah
EEDATA
EEPROM Data Register
0000 0000 0000 0000
9Bh
EEADR
EEPROM Address Register
-000 0000 -000 0000
9Ch
EECON1
WRERR WREN
WR
RD
---- x000 ---- q000
9Dh
EECON2(1) EEPROM Control Register 2
---- ---- ---- ----
Legend: x = unknown, u = unchanged, – = unimplemented read as ‘0’, q = value depends upon condition.
Shaded cells are not used by the data EEPROM module.
Note 1: EECON2 is not a physical register.
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