MC68306 Motorola, MC68306 Datasheet - Page 37

• Manufacturer Part Number: MC68306
• Description: Integrated EC000 Processor
• Manufacturer: Motorola

strobe. When the A0 bit equals zero, UDS is asserted; when the A0 bit equals one, LDS is
asserted.
The word write cycle flowchart is shown in Figure 3-5. The byte write cycle flowchart is
shown in Figure 3-6. The word and byte write cycle timing is shown in Figure 3-7.
MOTOROLA
1) PLACE FUNCTION CODE ON FC2–FC0
2) PLACE ADDRESS ON ADDRESS BUS
3) ASSERT ADDRESS STROBE (AS)
4) SET R/W TO WRITE
5) PLACE DATA ON D15–D0
6) ASSERT UPPER DATA STROBE (UDS)
1) NEGATE UDS AND LDS
2) NEGATE AS
3) REMOVE DATA FROM D15–D0
4) SET R/W TO READ
AND LOWER DATA STROBE (LDS)
TERMINATE OUTPUT TRANSFER
ADDRESS THE DEVICE
START NEXT CYCLE
BUS MASTER
Figure 3-5. Word Write Cycle Flowchart
MC68306 USER'S MANUAL
1) DECODE ADDRESS
2) LATCH DATA ON D15–D0
3) ASSERT DATA TRANSFER
1) NEGATE DTACK
ACKNOWLEDGE (DTACK)
TERMINATE THE CYCLE
INPUT THE DATA
SLAVE
3- 5