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ST63T73J5B1 Scheda tecnica(PDF) 9 Page - STMicroelectronics

Il numero della parte ST63T73J5B1
Spiegazioni elettronici  8-BIT ROM/OTP/EPROM MCUs FOR DIGITALLY CONTROLLED MULTISYNC/MULTISTANDARD MONITORS
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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ST6373
9/64
MEMORY SPACES (Cont’d)
Program ROM Page Register (PRPR)
Address: CAh - Write only
Reset Value: XXh
D7-D3. These bits are not used but have to be
written to “0”.
PRPR2-PRPR0. These are the program ROM
banking bits and the value loaded selects the cor-
responding page to be addressed in the lower part
of 4K program address space as specified in Table
3.This register is undefined on reset.
Note:
Only the lower part of address space has been
bankswitched because interrupt vectors and com-
mon subroutines should be available all the time.
The reason of this structure is due to the fact that it
is not possible to jump from a dynamic page to an-
other, unless jumping back to the static page,
changing contents of PRPR, and, then, jumping to
a different dynamic page.
Care is required when handling the PRPR as it is
write only. For this reason, it is not allowed to
change the PRPR contents while executing inter-
rupts drivers, as the driver cannot save and than re-
store its previous content. Anyway, this operation
may be necessary if the sum of common routines
and interrupt drivers will take more than 2K bytes;
in this case could be necessary to divide the inter-
rupt driver in a (minor) part in the static page (start
and end), and in the second (major) part in one dy-
namic page. If it is impossible to avoid the writing of
this register in interrupts drivers, an image of this
register must be saved in a RAM location, and each
time the program writes the PRPR bit writes also
the image register. The image register must be
written first, so if an interrupt occurs between the
two instructions the PRPR is not affected.
Table 3. Program Memory Page Register Coding
Table 4. ST6373 Program Memory Map
Note *): all reserved areas must be set to FFh in the ROM code.
70
-
-
-
-
-
PRPR2 PRPR1 PRPR0
PRPR2 PRPR1 PRPR0 PC11
Memory Page
X
X
X
1
Static Page (Page 1)
000
0
Page 0
0
0
1
0
Page 1 (Static Page)
010
0
Page 2
011
0
Page 3
100
0
Page 4
101
0
Page 5
110
0
Page 6
111
0
Page 7
Program Memory Page
Device Address
Description*)
PAGE 0
0000h-007Fh
0080h-07FFh
Reserved
User ROM
PAGE 1
“STATIC”
0800h-0F9Fh
0FA0h-0FEFh
0FF0h-0FF7h
0FF8h-0FFBh
0FFCh-0FFDh
0FFEh-0FFFh
User ROM
Reserved
Interrupt Vectors
Reserved
NMI Vector
Reset Vector
PAGE 2
0000h-000Fh
0010h-07FFh
Reserved
User ROM
PAGE 3
0000h-000Fh
0010h-07FFh
Reserved
User ROM (End of 8K)
PAGE 4
0000h-000Fh
0010h-07FFh
Reserved
User ROM
PAGE 5
0000h-000Fh
0010h-07FFh
Reserved
User ROM (End of 12K)
PAGE 6
0000h-000Fh
0010h-07FFh
Reserved
User ROM
PAGE 7
0000h-000Fh
0010h-07FFh
Reserved
User ROM (End of 16K)


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