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MC68HC000 Datasheet(PDF) 44 Page - Freescale Semiconductor, Inc |
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MC68HC000 Datasheet(HTML) 44 Page - Freescale Semiconductor, Inc |
44 / 189 page 4- 6 M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL MOTOROLA BUS MASTER ADDRESS THE DEVICE 1) SET R/W TO READ 2) PLACE FUNCTION CODE ON FC2–FC0 3) PLACE ADDRESS ON A23–A0 4) ASSERT ADDRESS STROBE (AS) 5) ASSERT LOWER DATA STROBE (LDS) (DS ON MC68008) TERMINATE THE CYCLE INPUT THE DATA 1) DECODE ADDRESS 2) PLACE DATA ON D7–D0 3) ASSERT DATA TRANSFER ACKNOWLEDGE (DTACK) SLAVE START NEXT CYCLE 1) REMOVE DATA FROM D7–D0 2) NEGATE DTACK 1) LATCH DATA 1) NEGATE LDS OR DS 2) START DATA MODIFICATION ACQUIRE THE DATA START OUTPUT TRANSFER 1) SET R/W TO WRITE 2) PLACE DATA ON D7–D0 3) ASSERT LOWER DATA STROBE (LDS) (DS ON MC68008) TERMINATE OUTPUT TRANSFER 1) NEGATE DS OR LDS 2) NEGATE AS 3) REMOVE DATA FROM D7–D0 4) SET R/W TO READ INPUT THE DATA 1) STORE DATA ON D7–D0 2) ASSERT DATA TRANSFER ACKNOWLEDGE (DTACK) TERMINATE THE CYCLE 1) NEGATE DTACK Figure 4-5. Read-Modify-Write Cycle Flowchart Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
Número de pieza similar - MC68HC000 |
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Descripción similar - MC68HC000 |
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