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AT80C51RA2-RLSIV 数据表(PDF) 43 Page - ATMEL Corporation |
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AT80C51RA2-RLSIV 数据表(HTML) 43 Page - ATMEL Corporation |
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43 / 86 page  43 4188F–8051–01/08 AT/TS8xC51Rx2 Table 6-19. IPH Register IPH - Interrupt Priority High Register (B7h) Reset Value = X000 0000b Not bit addressable 7 6 5 4 3 2 1 0 - PPCH PT2H PSH PT1H PX1H PT0H PX0H Bit Number Bit Mnemonic Description 7 - Reserved The value read from this bit is indeterminate. Do not set this bit. 6 PPCH PCA interrupt priority bit high. PPCHPPC Priority Level 0 0 Lowest 0 1 1 0 1 1 Highest 5 PT2H Timer 2 overflow interrupt Priority High bit PT2H PT2 Priority Level 0 0 Lowest 0 1 1 0 1 1 Highest 4 PSH Serial port Priority High bit PSH PS Priority Level 0 0Lowest 0 1 1 0 1 1Highest 3 PT1H Timer 1 overflow interrupt Priority High bit PT1H PT1Priority Level 0 0Lowest 0 1 1 0 1 1Highest 2 PX1H External interrupt 1 Priority High bit PX1HPX1Priority Level 0 0Lowest 0 1 1 0 1 1Highest 1 PT0H Timer 0 overflow interrupt Priority High bit PT0H PT0 Priority Level 0 0 Lowest 0 1 1 0 1 1 Highest 0 PX0H External interrupt 0 Priority High bit PX0HPX0 Priority Level 0 0 Lowest 0 1 1 0 1 1 Highest |
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