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AM186EM-33VC/W 数据表(PDF) 60 Page - Advanced Micro Devices |
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AM186EM-33VC/W 数据表(HTML) 60 Page - Advanced Micro Devices |
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60 / 98 page  60 Am186/188EM and Am186/188EMLV Microcontrollers PRELIMINA R Y COMMERCIAL SWITCHING CHARACTERISTICS AND WAVEFORMS In the switching waveforms that follow, several abbre- viations are used to indicate the specific periods of a bus cycle. These periods are referred to as time states. A typical bus cycle is composed of four consecutive time states: t1, t2, t3, and t4. Wait states, which represent multiple t3 states, are referred to as tw states. When no bus cycle is pending, an idle (ti) state occurs. In the switching parameter descriptions, the multi- plexed address is referred to as the AD address bus; the demultiplexed address is referred to as the A address bus. Key to Switching Waveforms Must be Steady May Change from H to L May Change from L to H Does Not Apply Don’t Care, Any Change Permitted Will be Steady Will be Changing from H to L Will be Changing from L to H Changing, State Unknown Center Line is High- Impedance Off State WAVEFORM INPUT OUTPUT Invalid Invalid |
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