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ST63T73 Datasheet(PDF) 11 Page - STMicroelectronics

No. de pieza ST63T73
Descripción Electrónicos  8-BIT ROM/OTP/EPROM MCUs FOR DIGITALLY CONTROLLED MULTISYNC/MULTISTANDARD MONITORS
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
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ST63T73 Datasheet(HTML) 11 Page - STMicroelectronics

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ST6373
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MEMORY SPACES (Cont’d)
Data ROM Addressing. All the read-only data are
physically implemented in the ROM in which the
Program Space is also implemented. The ROM
therefore contains the program to be executed and
also the constants and the look-up tables needed
for the program. The locations of Data Space in
which the different constants and look-up tables
are addressed by the ST6 Core can be considered
as being a 64-byte window through which it is pos-
sible to access to the read-only data stored in the
ROM. This window is located from the 40h ad-
dress to the 7Fh address in the Data space and al-
lows the direct reading of the bytes from the 000h
address to the 03Fh address in the ROM. All the
bytes of the ROM can be used to store either in-
structions or read-only data. Indeed, the window
can be moved by step of 64 bytes along the ROM
in writing the appropriate code in the Write-only
Data ROM Window register (DRWR, location
C9h). The effective address of the byte to be read
as a data in the ROM is obtained by the concate-
nation of the 6 less significant bits of the address in
the Data Space (as less significant bits) and the
content of the DRWR (as most significant bits). So
when addressing location 40h of data space, and
0 is loaded in the DRWR, the physical addressed
location in ROM is 00h.
Data ROM Window Register (DWR)
Address: C9h - Write only
Reset Value: XXh
DWR7-DWR0. These are the Data Rom Window
bits that correspond to the upper bits of data ROM
program space. This register is undefined after re-
set.
Note:
Care is required when handling the DRWR as it is
write only. For this reason, it is not allowed to
change the DRWR contents while executing inter-
rupts drivers, as the driver cannot save and than
restore its previous content. If it is impossible to
avoid the writing of this register in interrupts driv-
ers, an image of this register must be saved in a
RAM location, and each time the program writes
the DRWR it writes also the image register. The
image register must be written first, so if an inter-
rupt occurs between the two instructions the
DRWR register is not affected.
Figure 6. Data ROM Window Memory Addressing
70
DWR 7 DWR6 DWR5 DWR4 DWR3 DWR2
DWR1
DWR0
DATA ROM
WINDOW REGISTER
CONTENTS
DATA SPACE ADDRESS
40h-7Fh
IN INSTRUCTION
PROGRAM SPACE ADDRESS
65
432
0
5432
10
5432
10
READ
1
6
7
8
9
10
11
01
VR01573B
12
1
0
DATA SPACE ADDRESS
59h
0
0
0
0
0
1
00
1
1
1
Example:
(DWR)
DWR=28h
11
0000
00
00
1
ROM
ADDRESS:A19h
11
13
01
7
0
0


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