MC68HC000EI20 Freescale Semiconductor, MC68HC000EI20 Datasheet - Page 42

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

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: -

4-4
FC2–FC0
A23–A0
DTACK
D7–D0
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)
1) NEGATE LDS OR DS
2) NEGATE AS
3) REMOVE DATA FROM D7-D0
4) SET R/W TO READ
CLK
LDS
R/W
OR DS
TERMINATE OUTPUT TRANSFER
AS
ADDRESS THE DEVICE
START NEXT CYCLE
BUS MASTER
S0 S1 S2 S3 S4 S5 S6 S7 S0 S1 S2 S3 S4 S5 S6 S7 S0 S1 S2 S3 S4 S5 S6 S7
M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL
ODD BYTE WRITE
Figure 4-4. Write-Cycle Timing Diagram
Figure 4-3. Byte Write-Cycle Flowchart
Freescale Semiconductor, Inc.
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Go to: www.freescale.com
ODD BYTE WRITE
1) DECODE ADDRESS
2) STORE DATA ON D7–D0
3) ASSERT DATA TRANSFER
1) NEGATE DTACK
ACKNOWLEDGE (DTACK)
TERMINATE THE CYCLE
INPUT THE DATA
EVEN BYTE WRITE
SLAVE
MOTOROLA