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MC68HC000 Datasheet(PDF) 42 Page - Freescale Semiconductor, Inc |
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MC68HC000 Datasheet(HTML) 42 Page - Freescale Semiconductor, Inc |
42 / 189 page 4- 4 M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL MOTOROLA BUS MASTER ADDRESS THE DEVICE 1) PLACE FUNCTION CODE ON FC2–FC0 2) PLACE ADDRESS ON A23–A0 3) ASSERT ADDRESS STROBE (AS) 4) SET R/W TO WRITE 5) PLACE DATA ON D0–D7 6) ASSERT LOWER DATA STROBE (LDS) OR DS 1) NEGATE LDS OR DS 2) NEGATE AS 3) REMOVE DATA FROM D7-D0 4) SET R/W TO READ TERMINATE THE CYCLE INPUT THE DATA 1) DECODE ADDRESS 2) STORE DATA ON D7–D0 3) ASSERT DATA TRANSFER ACKNOWLEDGE (DTACK) SLAVE START NEXT CYCLE TERMINATE OUTPUT TRANSFER 1) NEGATE DTACK Figure 4-3. Byte Write-Cycle Flowchart S0 S1 S2 S3 S4 S5 S6 S7 S0 S1 S2 S3 S4 S5 S6 S7 S0 S1 S2 S3 S4 S5 S6 S7 CLK FC2–FC0 A23–A0 AS LDS R/W DTACK D7–D0 EVEN BYTE WRITE ODD BYTE WRITE ODD BYTE WRITE Figure 4-4. Write-Cycle Timing Diagram 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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