MC68HC000EI20 Freescale Semiconductor, MC68HC000EI20 Datasheet - Page 51

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MC68HC000EI20

Manufacturer Part Number
MC68HC000EI20
Description
IC MPU 16BIT 20MHZ 68-PLCC
Manufacturer
Freescale Semiconductor
Datasheet

Specifications of MC68HC000EI20

Processor Type
M680x0 32-Bit
Speed
20MHz
Voltage
3.3V, 5V
Mounting Type
Surface Mount
Package / Case
68-PLCC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-

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The word and byte write-cycle timing diagram and flowcharts in Figures 5-5, 5-6, and 5-7
applies directly to the MC68000, the MC68HC000, the MC68HC001 (in 16-bit mode), the
MC68EC000 (in 16-bit mode), and the MC68010.
MOTOROLA
1) PLACE FUNCTION CODE ON FC2–FC0
2) PLACE ADDRESS ON A23–A1
3) ASSERT ADDRESS STROBE (AS)
4) SET R/W TO WRITE
5) PLACE DATA ON D15–D0
6) ASSERT UPPER DATA STROBE (UDS)
1) PLACE FUNCTION CODE ON FC2–FC0
2) PLACE ADDRESS ON A23–A1
3) ASSERT ADDRESS STROBE (AS)
4) SET R/W TO WRITE
5) PLACE DATA ON D0–D7 OR D15–D8
6) ASSERT UPPER DATA STROBE (UDS)
1) NEGATE UDS AND LDS
2) NEGATE AS
3) REMOVE DATA FROM D7-D0 OR
4) SET R/W TO READ
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)
(ACCORDING TO INTERNAL A0)
OR LOWER DATA STROBE (LDS)
(BASED ON INTERNAL A0)
D15-D8
TERMINATE OUTPUT TRANSFER
TERMINATE OUTPUT TRANSFER
ADDRESS THE DEVICE
ADDRESS THE DEVICE
START NEXT CYCLE
START NEXT CYCLE
BUS MASTER
BUS MASTER
M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL
Freescale Semiconductor, Inc.
Figure 5-5. Word Write-Cycle Flowchart
Figure 5-6. Byte Write-Cycle Flowchart
For More Information On This Product,
Go to: www.freescale.com
1) DECODE ADDRESS
2) STORE DATA ON D15–D0
3) ASSERT DATA TRANSFER
1) DECODE ADDRESS
2) STORE DATA ON D7–D0 IF LDS IS
3) ASSERT DATA TRANSFER
1) NEGATE DTACK
1) NEGATE DTACK
ACKNOWLEDGE (DTACK)
ASSERTED. STORE DATA ON D15–D8
IF UDS IS ASSERTED
ACKNOWLEDGE (DTACK)
TERMINATE THE CYCLE
TERMINATE THE CYCLE
INPUT THE DATA
INPUT THE DATA
SLAVE
SLAVE
5- 5

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