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USER’S GUIDE
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16
case is to select a Range of 8K, and to choose a Parti-
tion of greater than 8K. This will result in the Range as
the limiting factor. Addresses above the Range will auto-
matically be deflected to the Expanded bus. No data
memory will be allocated in NV RAM for this configura-
tion.
DS5000 Memory Map Control
The Partition and Range can be selected using the
Bootstrap Loader discussed in a later section. In addi-
tion, the Partition can be selected or modified by the ap-
plication software and CE2
is normally software con-
trolled. However, in either case, the MCON SFR is used
to choose these settings. The MCON is summarized in
the SFR section below, but appears here also.
DS5000 SERIES MCON REGISTER Figure 4–4
Bit Description:
MCON.7–4: PA3–0
“Partition Address”: Use to select the starting address of Data Memory in Embedded RAM. Pro-
gram space lies below the Partition address.
Selection:
PA3 PA2 PA1 PA0 Partition Address
0 0 0 0 0000H
0 0 0 1 0800H
0 0 1 0 1000H
0 0 1 1 1800H
0 1 0 0 2000H
0 1 0 1 2800H
0 1 1 0 3000H
0 1 1 1 3800H
1 0 0 0 4000H
1 0 0 1 4800H
1 0 1 0 5000H
1 0 1 1 5800H
1 1 0 0 6000H
1 1 0 1 6800H
1 1 1 0 7000H*
1 1 1 1 8000H*
*A 4K byte increment (not 2K bytes) in the Partition Address takes
place between bit field values 1110B and 1111B.
Initialization: Set to all 1’s on a No V
LI
Power On Reset or when the Security Lock bit is
cleared to a 0 from a previous 1 state. These bits are also set to all 1’s when
any attempt is made to have them cleared to all 0’s with the SL bit set to a 1
(illegal condition).
Read Access: May be read anytime.
Write Access: PAA bit must = 1 in order to write PA3–0. Timed Access is not required to
write to PA3–0 once PAA = 1.