XE5224DM Ver la hoja de datos (PDF) - Xecom

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XE5224DM

Blackjack Tele-Controller

Xecom 

Tele-Controller Memory Configuration continued

Table 2

CNFG2 CNFG1

0

0

0

1

1

0

1

1

Application Mode Memory Mapping (CFG0=1)

Program Memory

Data Memory

Program/Data

0 - 7FFF

0 -7EFF0

7F00 - 7FFF

8000 - FFFF

Flash Memory, Page 0

(write protected)

RAM

Peripheral I/Os

Flash Memory, Page 1

Flash Memory, Page 0

(write protected)

RAM

Peripheral I/Os

Flash Memory, Page 1

(write protected)

Flash Memory, Page 2

(write protected)

RAM

Peripheral I/Os

Flash Memory, Page 3

Flash Memory, Page 2

(write protected)

RAM

Peripheral I/Os

Flash Memory, Page 3

(write protected)

Overlapped Memory:

Data and Program memory share the upper half of

the available memory, addresses 8000 to FFFF.

This area can be accessed as either Program or

Data memory. When downloading Program code

into the XE5224, the code must be stored as Data in

addresses 8000 to FFFF. When the download is

complete, you can access this code as Program

memory because of the memory overlap.

Memory Overlap

Development Mode

Flash memory may store both user data and the

application program; however, because all pages of

Flash memory are physically located in one device,

you cannot simultaneously read and write from

Flash memory. When the application program must

manipulate stored data, a portion of RAM must be

used as program memory. Memory locations

locations 7E00 to 7EFF overlap RAM and Flash

memory in the Application mode. Reserve these

memory locations for subroutines which require

manipulation of the stored data.

Application Mode

Program & Data

Memory Overlap

(32K)

8000 - FFFF

Flash Memory Page 1, 2, 3 or 4

Program & Data

Memory Overlap

(32K)

Flash Memory Page 1 or 3

8000 - FFFF

EPROM

(32K)

Reserved for Peripheral I/0

SRAM

(32K)

0 - 7EFF

Reserved for Peripheral I/0

RAM Overlap Addresses 7E00 to 7EFF

Flash Memory

Page 0 or 2

(32K)

SRAM

(32K)

0 - 7DFF

Program

Memory

Data

Memory

Program

Memory

Data

Memory

XECOM

(6)

XE5224DM & XE5224FD

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