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XE5224DM

Blackjack Tele-Controller

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Tele-Controller Memory Configuration continued

ROM:

Tele-Controller ROM holds the TC-Monitor and

Tele-Monitor programs to assist in application

development. These programs operate only in

Development mode. These design tools permit the

user to down-load his application program to Flash

memory from either the embedded modem or Serial

Port, edit Flash memory contents, run Analog/Digital

conversions, set and display the Real-Time Clock,

and execute the application program. TC-Monitor

and Tele-Monitor operations are described in detail

elsewhere in this data sheet.

RAM:

32 Kbytes of RAM are primarily used for data

storage by the application program. The

addressable range is from 0 to 7EFF. Addresses

7E00 to 7EFF overlap with program memory in the

Application mode. These locations should be used

for subroutines which need to access data stored in

Flash memory. Addresses 7F00 to 7FFF are

reserved for peripheral I/O use in both Development

and Application mode.

Flash:

Flash memory provides 128 Kbytes of non-volatile

storage for data and/or application programs. Flash

memory is divided into four, 32 Kbyte pages to fit in

the 8051 memory structure. The 128 Kbytes of

Flash memory are contained in one memory chip

within the XE5224.

In Development mode Flash memory is addressed

as the upper 32 Kbytes of overlapped memory,

addresses 8000 to FFFF. The CNFG1 and CNFG2

control lines determine which page of Flash memory

is being addressed.

In Application mode program code may be stored in

any page or pages of Flash memory. Data may be

stored only in Flash memory pages 1 and 3. Again

CNFG1 and CNFG2 control the configuration of

Flash memory. Pages of Flash Memory used for

program storage are write protected.

XE5224DM & XE5224FD

(7)

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