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MC68HC000 Datasheet(PDF) 63 Page - Freescale Semiconductor, Inc |
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MC68HC000 Datasheet(HTML) 63 Page - Freescale Semiconductor, Inc |
63 / 189 page MOTOROLA M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL 5- 17 RA XX RA RA RA XX R+A XA RA RX 1 1 R = Bus Request Internal A = Bus Grant Acknowledge Internal G = Bus Grant T = Three-state Control to Bus Control Logic X = Don't Care Notes: 1. State machine will not change if the bus is S0 or S1. Refer to 5.2.3. BUS ARBITRATION CONTROL. 2. The address bus will be placed in the high-impedance state if T is asserted and AS is negated. R R R X R X R R (a) 3-Wire Bus Arbitration (b) 2-Wire Bus Arbitration GT GT GT GT RA RA RA RA XA RA GT RA GT GT GT GT GT GT GT STATE 1 STATE 0 STATE 4 STATE 2 STATE 3 Figure 5-18. Bus Arbitration Unit State Diagrams Figures 5-19, 5-20, and 5-21 applies to all processors using 3-wire bus arbitration. Figures 5-22, 5-23, and 5-24 applies to all processors using 2-wire bus arbitration. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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