Rainbow Electronics AT89C5122 - Manual (Page 32)

32
AT8xC5122/23
4202E–SCR–06/06
AT83C5123 Version The AT83C5123 device is a low pin count version of the AT8xC5122.
The ROM version implements :
- 30 KB of ROM mapped from 0000 to 77FF 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
Figure 15. AT83C5123’s Device
PROGRAM MEMORY
(Read only)
7FFF
INTERNAL
30K ROM
RESET@
<0000>
SFR
Space
80
FF
On-chip
512 bytes
XRAM
0000
01FF
00
7F
80
FF
Upper
128 Bytes
RAM
Lower
128 Bytes
RAM
DATA MEMORY
(Read / Write)
On-Chip 256 bytes RAM
Direct
Addressing Indirect
Addressing
512 Bytes
INTERNAL
E2PROM
01FF
0000
OPTIONAL