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参数资料
| 型号： | SAB-C505-2R16M |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP44 |
| 封装： | PLASTIC, MQFP-44 |
| 文件页数： | 55/88页 |
| 文件大小： | 1013K |
| 代理商： | SAB-C505-2R16M |
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C505/C505C/C505A/C505CA
Data Sheet
55
12.00
Lock Bits Programming / Read
The C505A-4E/C505CA-4E has two programmable lock bits which, when programmed according
to Table 13, provide four levels of protection for the on-chip OTP code memory. The state of the
lock bits can also be read.
Table 12
Access Modes Selection
Access Mode
EA/
VPP
PROG
PRD
PMSEL
Address
(Port 2)
Data
(Port 0)
10
Program OTP memory byte
VPP
HH
H
A0-7
A8-14
D0-7
Read OTP memory byte
VIH
H
Program OTP lock bits
VPP
HH
L
–
D1,D0 see
Read OTP lock bits
VIH
H
Read OTP version byte
VIH
H
L
H
Byte addr.
of sign. byte
D0-7
Table 13
Lock Bit Protection Types
Lock Bits at D1,D0
Protection
Level
Protection Type
D1
D0
1
Level 0
The OTP lock feature is disabled. During normal operation of
the C505A-4E/C505CA-4E, the state of the EA pin is not
latched on reset.
1
0
Level 1
During normal operation of the C505A-4E/C505CA-4E, MOVC
instructions executed from external program memory are
disabled from fetching code bytes from internal memory. EA is
sampled and latched on reset. An OTP memory read operation
is only possible using the ROM/OTP verification mode 2 for
protection level 1. Further programming of the OTP memory is
disabled (reprogramming security).
0
1
Level 2
Same as level 1, but also OTP memory read operation using
OTP verification mode is disabled.
0
Level 3
Same as level 2; but additionally external code execution by
setting EA=low during normal operation of the C505A-4E/
C505CA-4E is no more possible.
External code execution, which is initiated by an internal
program (e.g. by an internal jump instruction above the ROM
boundary), is still possible.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SAB-C505-2RM | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller |
| SAB-C505A-4EM | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller |
| SAB-C505A-4EM-BA | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| SAB-C505C-2RM | 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:8-Bit CMOS Microcontroller |
| SAB-C505CA-4EM | 制造商:Infineon Technologies 功能描述:Bulk |
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