參數(shù)資料
型號: 16F630
廠商: Microchip Technology Inc.
英文描述: 14-Pin FLASH-Based 8-Bit CMOS Microcontrollers
中文描述: 14引腳基于閃存的8位CMOS微控制器
文件頁數(shù): 54/132頁
文件大?。?/td> 2651K
代理商: 16F630
PIC16F630/676
DS40039C-page 52
2003 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
NOP
s) 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
EECON2
(1)
EEPROM Control Register 2
WRERR
WREN
WR
RD
---- x000 ---- q000
9Dh
---- ---- ---- ----
Legend:
x
= unknown,
u
= unchanged, - = unimplemented read as '0',
q
= value depends upon condition.
Shaded cells are not used by Data EEPROM module.
Note
1:
EECON2 is not a physical register.
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