MC68EC000EI20 Freescale Semiconductor, MC68EC000EI20 Datasheet - Page 5

• Manufacturer Part Number: MC68EC000EI20
• Description: IC MPU 32BIT 20MHZ 68-PLCC
• Manufacturer: Freescale Semiconductor

Specifications of MC68EC000EI20

• 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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power consumption to its quiescent value
low-power mode described below will be routinely tested as part of the MC68SEC000 test vectors provided
by Motorola.
To successfully enter the low-power mode, the MC68SEC000 must first be in the supervisor mode. A
recommended method for entering the low-power mode is to use the TRAP instruction, which causes the
processor to begin exception processing, thus entering the supervisor mode. External circuitry should
accomplish the following steps during the trap routine:
1.
ADDRESS_MATCH
RESTART
The preliminary specification for the MC68SEC000’s current drain while in the low-power mode is Idd < 2 A for 3.3V operation and
Idd < 5 A for 5.0V operation.
RESET
1. Externally detect a write to the low-power address. You select this address which can be any address
2. Execute the STOP instruction. The external circuitry shown in Figure 2 and Figure 3 will count the
in the 16 Mbyte addressing range of the MC68SEC000. A write to the low-power address can be
detected by polling A23–A0, R/W, and FC2–FC0. When the low-power address is detected, R/W is
a logic low, and the function codes have a five (101) on their output, the processor is writing to the
low-power address in supervisor mode and user-designed circuitry should assert the
ADDRESS_MATCH signal shown in Figure 2 and Figure 3.
number of bus cycles starting with the write to the low-power address and will stop the processor
clock on the first falling edge of the system clock after the bus cycle that reads the immediate data
of the STOP instruction. Figure 3 has one more flip-flop than Figure 2 because the MC68SEC000 in
ADDRESS_MATCH
RESTART
RESET
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Figure 2. MC68SEC000 Low-Power Circuitry for 16-Bit Data Bus
Figure 3. MC68SEC000 Low-Power Circuitry for 8-Bit Data Bus
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Freescale Semiconductor, Inc.
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For More Information On This Product,
M68000 USER’S MANUAL ADDENDUM
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Go to: www.freescale.com
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while maintaining the internal state of the processor. The
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SYSTEM_CLK
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SYSTEM_CLK
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CPU_CLK
MOTOROLA
CPU_CLK