AT83EC5123 ATMEL Corporation, AT83EC5123 Datasheet - Page 158

• Manufacturer Part Number: AT83EC5123
• Description: (AT8xx512x) Smart Card Reader ICs
• Manufacturer: ATMEL Corporation

ROM Configuration
Case EA = 0
Case EA = 1
Memory Mapping
158
AT8xC5122/23
The product provides the following program and data memory spaces.
The instruction codes are fetched from external or internal program memory depending
on the logic state of microcontroller’s EA pin. Only valid for high pin count packages
(VQFP64).
After the reset the program counter is initialised to 0000h and the code instructions are
fetched from external program memory.
After a reset the program counter is initialized to 0000h and the customer application
contained in internal ROM is executed from address 0000h to 7FFFh.
The program memory space is described in figure below:
Figure 91. ROM Contents (ROM Configuration)
In the products ROM versions, the following internal spaces are defined:
•
•
•
•
The specific accesses from/to these memories are:
•
•
RAM
XRAM
CRAM: 32K Bytes Program RAM Memory
ROM
address the XRAM space.
space.
XRAM: if the bit RPS in RCON (described below) is reset, MOVX instructions
CRAM: if the bit RPS in RCON is set, MOVX instructions address the CRAM
Reset@<0000>
7FFF
ROM Configuration
CODE
USER
ROM
4202B–SCR–07/03