MC68HC000EI16 Freescale Semiconductor, MC68HC000EI16 Datasheet - Page 72

• Manufacturer Part Number: MC68HC000EI16
• Description: IC MPU 32BIT 16MHZ 68-PLCC
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC000EI16

• Processor Type: M680x0 32-Bit
• Speed: 16MHz
• Voltage: 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 68-PLCC
• Family Name: M68000
• Device Core: ColdFire
• Device Core Size: 16/32Bit
• Frequency (max): 16MHz
• Instruction Set Architecture: RISC
• Supply Voltage 1 (typ): 5V
• Operating Supply Voltage (max): 5.25V
• Operating Supply Voltage (min): 4.75V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 68
• Package Type: PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Compliant

5.4.2 Retrying The Bus Cycle
The assertion of the bus error signal during a bus cycle in which HALT is also asserted by
an external device initiates a retry operation. Figure 5-27 is a timing diagram of the retry
operation. The delayed BERR signal in the MC68010 also initiates a retry operation when
HALT is asserted by an external device. Figure 5-28 shows the timing of the delayed
operation.
5-26
LDS/UDS
FC2-FC0
D15–D0
A23–A1
DTACK
BERR
HALT
R/W
CLK
AS
S0
In the MC68010, if a read-modify-write operation terminates in
a bus error, the processor reruns the entire read-modify-write
operation when the RTE instruction at the end of the bus error
handler returns control to the instruction in error. The
processor reruns the entire operation whether the error
occurred during the read or write portion.
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M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL
READ
Figure 5-27. Retry Bus Cycle Timing Diagram
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Freescale Semiconductor, Inc.
For More Information On This Product,
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Go to: www.freescale.com
1 CLOCK PERIOD
NOTE
HALT
S0
S2
RETRY
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MOTOROLA