MC68HC000EI20 Freescale Semiconductor, MC68HC000EI20 Datasheet - Page 40

• 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: -

4-2
FC2–FC0
(DS)
A23–A0
DTACK
D7–D0
R/W
CLK
LDS
AS
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)
1) LATCH DATA
2) NEGATE LDS (DS FOR MC68008)
3) NEGATE AS
(DS ON MC68008)
S0 S1 S2 S3 S4 S5 S6 S7 S0 S1 S2 S3 S4 S5 S6 S7 S0 S1 S2 S3 S4 w
ADDRESS THE DEVICE
ACQUIRE THE DATA
START NEXT CYCLE
BUS MASTER
M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL
Figure 4-2. Read and Write-Cycle Timing Diagram
READ
Figure 4-1. Byte Read-Cycle Flowchart
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
WRITE
1) DECODE ADDRESS
2) PLACE DATA ON D7–D0
3) ASSERT DATA TRANSFER
1) REMOVE DATA FROM D7–D0
2) NEGATE DTACK
ACKNOWLEDGE (DTACK)
TERMINATE THE CYCLE
INPUT THE DATA
2 WAIT STATE READ
SLAVE
w w w S5 S6 S7
MOTOROLA