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ST486 Folha de dados(PDF) 2 Page - STMicroelectronics

Nome de Peças ST486
Descrição Electrónicos  PROGRAMMING MANUAL
Download  34 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST486 Folha de dados(HTML) 2 Page - STMicroelectronics

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1.
SMM OVERVIEW
Pages
9
1.1 Introduction . . .... . ... ... .. . . . ... . ... .. ... .... . ... ... .. . . .
9
1.2 SGS Thomson SMM Features . . . . . . . . . . . . . . . . . . . . . . . . .... . . . . ... .
9
1.3 A Typical SMM Routine . . . . . . . . . . . . . . . . . . . . . . . . . .... ... . . . . . . . 10
2.
SGS THOMSON SMM IMPLEMENTATION
13
2.1 Hardware Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... ... .. ... 13
2.2 Configuration Control Registers . . . . . . . . . . . . ... ... .. ... ... .. . . . ... . 14
2.3 SMM Instruction Summary . . . . . . . . . . . . . . . . . . . ... ... .. ... ... .. . . . 18
3. SMM SOFTWARE CONSIDERATIONS
23
3.1 Enabling SMM . . . . . ... ... .. ... ... .. . . . ... . ... . . ... ... .. ... 23
3.2 SMM Handler Entry State . . . . . . . . . . . . . . . . . . . . . . .... . . . . ... . ... . 24
3.3 Maintaining the CPU State . . . . . . . . . . . . . . . ... ... .. ... ... .. . . . ... . 28
3.4 Initializing the SMM Environment . . . . . . . . . . . . . . . . . . . . . . . . .... ... . . . 31
3.5 Accessing Main Memory Overlapped by SMM Memory . . . . . . . ... ... .. ... ... . 32
3.6 I/O Restart
. . . . . . . . . . . . . . . . . . . . . . .... . . . . ... . ... . ... . ... . 33
3.7 I/O Port Shadowing and Emulation
. . . . . . . . . . . . . . . . . . . . . . . . . .... . ... 34
3.8 Return to HLT Instruction . . . . . . . . . . . . . . . . . . . . . . .... . . . . ... . ... . 35
3.9 Exiting the SMI Handler . . . .... . ... ... .. . . . ... . ... .. ... .... . . . . 37
3.10 Testing and Debugging SMM Code . . . .... ... . . . . . . . . . . . . . ... . ... . . . 38
4.
POWER MANAGEMENT FEATURES
41
4.1 Reducing the Clock Frequency . . . . . . . . . . . . . ... ... .. ... ... .. . . . ... . 41
4.2 Lowering the CPU Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . ... ... .. ... 41
4.3 Suspend Mode . . . . .... . ... ... .. . . . ... . ... .. ... .... . ... ... . 42
Appendix A
Assembler Macros for SGS Thomson Instructions
45
GENERAL INDEX
5


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