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ST486DX Scheda tecnica(PDF) 9 Page - STMicroelectronics

Il numero della parte ST486DX
Spiegazioni elettronici  PROGRAMMING MANUAL
PDF  34 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST486DX Scheda tecnica(HTML) 9 Page - STMicroelectronics

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Reg. Index = CDh
Reg. Index = CEh
Reg. Index = CFh
70
7
0
7
4
3
0
Base Address
Size
A31
A24
A23
A16
A15
A12
see table below
Table 2 - 3.
SMAR
SMM Address Region Registers
Bits 3-0
BLOCK SIZE
Bits 3-0
BLOCK SIZE
0h
Disable
8h
512 KBytes
1h
4 KBytes
9h
1 MBytes
2h
8 KBytes
Ah
2 MBytes
3h
16 KBytes
Bh
4 MBytes
4h
32 KBytes
Ch
8 MBytes
5h
64 KBytes
Dh
16 MBytes
6h
128 KBytes
Eh
32 MBytes
7h
256 KBytes
Fh
4 KBytes (same as 1h)
Table 2 - 4.
SMAR SIZE FIELD
ST486DX - SMM IMPLEMENTATION
17
to 1 while in normal mode. If NMIEN = 1 when an SMI occurs, an NMI could
occur before the SMM code has initialized the Interrupt Descriptor Table.



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