MC68EC000EI12 Freescale Semiconductor, MC68EC000EI12 Datasheet - Page 6

• Manufacturer Part Number: MC68EC000EI12
• Description: IC MPU 32BIT 12MHZ 68-PLCC
• Manufacturer: Freescale Semiconductor
• Series: 68K - M680X0r

Specifications of MC68EC000EI12

• Processor Type: M680x0 32-Bit
• Speed: 12MHz
• Voltage: 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 68-PLCC
• Core Size: 32 Bit
• Cpu Speed: 12MHz
• Digital Ic Case Style: PLCC
• No. Of Pins: 68
• Supply Voltage Range: 3V To 3.6V
• Operating Temperature Range: 0°C To +70°C
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Clock Frequency: 12MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

6
3. This step is optional depending on whether your applications require the MC68SEC000 signals with
8-bit mode requires two bus cycles to fetch the immediate data of the STOP instruction. After the
processor clock is disabled, it is often necessary to disable the clock to other sections of your circuit.
This can be done, but be careful that runt clocks and spurious glitches are not presented to the
MC68SEC000. A timing diagram is shown in Figure 4.
three-state capability to be placed into a high-impedance state. To place the MC68SEC000 into a
three-state condition, the proper method for arbitrating the bus (as described in 5.2 Bus Arbitration
in the M68000 User’s Manual, Rev 8 ) s hould be completed during the fetch of the status register data
for the STOP instruction. A timing diagram with the bus arbitration sequence is shown in Figure 5.
Note: While the MC68SEC000 is in the low-power mode, all inputs must be driven to V
pull-up or pull-down resistor.
Figure 5. MC68SEC000 Clock Stop Timing with Bus Arbitration for 16-Bit Data Bus
CPU_CLK
CPU_CLK
DTACK
DTACK
CLK
RW
AS
Figure 4. MC68SEC000 Clock Stop Timing for 16-Bit Data Bus
CLK
RW
BR
BG
AS
S0 S1 S2 S3 S4 S5 S6 S7
S0 S1 S2 S3 S4 S5 S6 S7
Freescale Semiconductor, Inc.
For More Information On This Product,
M68000 USER’S MANUAL ADDENDUM
Low-Power
Address
Low-Power
Write to
Address
Write to
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S0 S1 S2 S3 S4 S5 S6 S7
S0 S1 S2 S3 S4 S5 S6 S7
Fetch Immediate
Data of STOP
Fetch Immediate
Data of STOP
Instruction
Instruction
Stop
Stop
DD
or V
SS
MOTOROLA
, or have a