89C5121-SK1 Atmel, 89C5121-SK1 Datasheet - Page 60

• Manufacturer Part Number: 89C5121-SK1
• Description: KIT SMART CARD FOR AT89C5121
• Manufacturer: Atmel
• Type: Smart Cardr

Specifications of 89C5121-SK1

• Contents: Board
• For Use With/related Products: AT89C5121
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: T89C5121-SK1; T89C5121-SK1

Memory Management
Program Memory
ROM Configuration Byte
Program ROM Lock Bits
60
A/T8xC5121
All the T8xC5121 versions implement 16 Kbytes of ROM memory, 256 Bytes RAM and
256 Bytes XRAM.
The hardware configuration byte and the split of internal memory spaces depends on
the product and is detailed below.
Table 44. ROM Configuration Byte Hardware Register
The BLJRB depends of the product version:
•
•
This bit defines if, after reset, either the Customer ROM program or the Bootloader pro-
gram is executed (for In System programming).
The program Lock system protects the on-chip program against software piracy.
The T8xC5121 products are delivered with the highest protection level.
Table 45. T8xC5121 Products Protection Level
P = Programmed
Security
Number
Level
1: ROM mask version
0: EEPROM/CRAM versions
Bit
3
5-0
7
-
7
6
Program Lock Bits
LB1
Mnemonic
P
BLJRB
BLJRB
6
Bit
LB2
P
Description
Reserved
Bootloader Jump RAM Bit
Set to configure User Code in ROM
Clear to configure Bootlader in ROM
Reserved
5
-
Protection Description
SSOP24 version:
Read function is disabled.But checksum control is still enabled
PLCC52 version:
MOVC instruction executed from external program memory are disabled
from fetching code bytes from internal memory,
EA is sampled and latched on reset.
But checksum control is still enabled.
External execution is possible.
4
-
3
-
2
-
1
-
4164G–SCR–07/06
0