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ST486DX Scheda tecnica(PDF) 30 Page - STMicroelectronics |
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ST486DX Scheda tecnica(HTML) 30 Page - STMicroelectronics |
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30 / 34 page  ST486DX - SMM POWER MANAGEMENT FEATURES 42 4.3 Suspend Mode The SGS-Thomson CPU allows suspend mode to be entered either through software or hardware. The software initiates suspend mode through execution of a HLT instruction if CCR2 bit 3 (HALT) is set. After the HLT instruction is executed, the CPU enters suspend mode and asserts the suspend acknowledge (SUSPA#) pin (if the SUSP bit in CCR2 was set to enable the SUSPA# pin). Hardware initiates suspend mode by using two new pins on the CPU, SUSP# and SUSPA#. When SUSP# is asserted, the CPU first completes any pending instructions and bus cycles, and then enters suspend mode. Once in suspend mode, the SUSPA# pin is asserted by the CPU. |
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