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| 型号： | MTA85812S-10I/SS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 10 MHz, RISC MICROCONTROLLER, PDSO20 |
| 封装： | 0.209 INCH, PLASTIC, SSOP-20 |
| 文件页数： | 25/72页 |
| 文件大小： | 760K |
| 代理商： | MTA85812S-10I/SS |
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1995 Microchip Technology Inc.
DS40115C-page 31
MTA85XXX
14.0
CONFIGURATION FUSES
The configuration EPROM consists of four EPROM
fuses.
Two are for the selection of the oscillator type, one is
the watchdog timer enable fuse and one is the code
protection fuse.
FIGURE 14-1: CONFIGURATION WORD
14.1
ID Locations
Four memory locations are designated as ID locations
where the user can store checksum or other code-iden-
tification numbers. These locations are not accessible
during normal execution but are readable and writable
during program/verify.
Use only the lower 4-bits of the ID locations and always
program the upper 8-bits as '1's.
* Note: Microchip will assign a unique pattern
number for QTP and SQTP requests and
for ROM devices. This pattern number will
be unique and traceable to the submitted
code.
CP WDTE
OT1
OT0
Register: FUSES
Address:
N/A
bit0
11
_
protected
OT1:OT0: OSC selection fuses
11: RC oscillator
10: HS oscillator
01: XT oscillator
00: LP oscillator
WDTE: WDT enable fuse
1 = WDT enabled
0 = WDT disabled
CP: Code protection fuse
1 = Code protection off
0 = All memory is code
Unimplemented
14.2
Code Protection
The code in the program memory can be protected by
clearing the code protect bits.
In code protected mode, the configuration word will not
be protected, allowing reading of all bits.
14.2.1
PIC16C54A AND PIC16C58A
Once code protected, all memory locations read out in
a scrambled fashion. For EPROM devices, program
memory locations 40h and above cannot be further
programmed. However, the first 64 locations, 00h -
3Fh, may be programmed. These locations are not
considered secure.
14.2.2
PIC16CR58A
In a protected device, program memory locations 00h-
3Fh read out normally. Locations 40h and higher
cannot be read out.
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