Rainbow Electronics AT89C5122 - Manual (Page 29)

29
AT8xC5122/23
4202E–SCR–06/06
Figure 13. AT8xC5122’s CRAM and E2PROM Versions
Reset@ <0000>
EA = 0
PROGRAM
EXTERNAL
PROGRAM
PSEN
Reset@
0000
7FFF
8000
FFFF
32K
ROM
32K
CRAM
<F800>
EA = 1
INTERNAL
INTERNAL
32K
PROGRAM
EXTERNAL
ENBOOT=1 ENBOOT=0
8000
FFFF
MEMORY
On-chip
512 bytes
XRAM
0000
01FF
FFFF
RD WR
DATA MEMORY
(Read / Write)
0000
EXTRAM=0 EXTRAM=1
EXTERNAL
EXTERNAL
XRAM
XRAM
01FF
0200
PSEN Roll-Over
Roll-Over
MEMORY
MEMORY
32K
INTERNAL
E2PROM
(Read/Write)
(Read Only)
(Read/Write)
SFR
Space
80
FF
00
7F
80
FF
Upper
128 Bytes
RAM
Lower
128 Bytes
RAM
On-Chip 256 bytes RAM
Direct
Addressing Indirect
Addressing
512 Bytes
INTERNAL
E2PROM
01FF
0000
Optional
FFFF
8000
(applicable only to CRAM version)
(E2PROM version)