at83c5122 ATMEL Corporation, at83c5122 Datasheet - Page 30

• Manufacturer Part Number: at83c5122
• Description: At83c5123 C51 Microcontroller With Usb And Smart Card Reader Interfaces
• Manufacturer: ATMEL Corporation

AT8xC5122’s ROM
Version
Security Level
30
AT8xC5122/23
The AT8xC5122’s ROM version implements :
- 32 K of ROM mapped from 0000h to 7FFFh in which is embedded the user code. The
ROM device is only factory programmable.
- 512 bytes of E2PROM can be optionally implemented to store permanent data. With
this option, the size of ROM is reduced to 30K.
After the reset, the MCU begins the execution of the user code from location 0000h of
the ROM.
Access to external Program Memory is not allowed.
There are two security levels (applicable to High Pin Count packages only) :
Table 9. Security Levels Description
The security level 2 can be used to protect the user code from piracy. This option is con-
figured at factory and must be requested by the customer at order time.
Security Level
1
2
Protection description
No protection lock enabled
MOVC instruction executed from external Program Memory is disabled when fetching
code bytes from internal Program Memory
EA is sampled and latched on reset.
External code execution is enabled.
4202E–SCR–06/06