Memory Maps
There are several possible ways to configure the ad-
dress space of the Am186ER and Am188ER microcon-
trollers. Four of the most popular configurations are
shown in Figure 12.
1 Mbyte
1 Mbyte
1 Mbyte
1 Mbyte
External Flash
(UCS)
External Flash
(UCS)
External Flash
(UCS)
External Flash
(UCS)
768 Kbytes
544 Kbytes
512 Kbytes
768 Kbytes
Internal RAM
512 Kbytes
256 Kbytes
512 Kbytes
External RAM
(MCS3–MCS0)
External RAM
(LCS)
External RAM
(MCS)
32 Kbytes
0 Kbyte
32 Kbytes
0 Kbyte
32 Kbytes
0 Kbyte
Internal RAM
Internal RAM
Internal RAM
0 Kbyte
512 Kbytes Flash
No External RAM
256 Kbytes Flash
Internal RAM at 0
32 Kbytes External RAM
512 Kbytes Flash
Internal RAM at 0
256 Kbytes Flash
512 Kbytes External RAM
Internal RAM Located
Above External RAM
256 Kbytes External RAM
Shaded areas represent open memory that can be used by
other chip selects and the PCB, if located in memory.
Figure 12. Example Memory Maps
50
Am186TMER and Am188TMER Microcontrollers Data Sheet
AMD [ AMD ]
