Rainbow Electronics AT89C5122 - Manual (Page 31)

31
AT8xC5122/23
4202E–SCR–06/06
Figure 14. AT8xC5122’s ROM Version
PROGRAM MEMORY
(Read only)
0000
7FFF
FFFF
EA=1
INTERNAL
32K ROM
EA=0
EXTERNAL
EXTERNAL
RESET@
<0000>
SFR
Space
80
FF
On-chip
512 bytes
XRAM
0000
01FF
FFFF
RD WR
00
7F
80
FF
Upper
128 Bytes
RAM
Lower
128 Bytes
RAM
DATA MEMORY
(Read / Write)
0000
EXTRAM=0 EXTRAM=1
EXTERNAL
EXTERNAL
XRAM
XRAM
01FF
0200
8000
Roll-Over
PSEN
On-Chip 256 bytes RAM
Direct
Addressing Indirect
Addressing
512 Bytes
INTERNAL
E2PROM
01FF
0000
Optional
Roll-Over