MC68306EH16B Freescale Semiconductor, MC68306EH16B Datasheet - Page 58

• Manufacturer Part Number: MC68306EH16B
• Description: IC MPU INTEGRATED 16MHZ 132-PQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68306EH16B

• Processor Type: M683xx 32-Bit
• Speed: 16MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 132-MQFP, 132-PQFP
• Controller Family/series: 68K
• Core Size: 32 Bit
• Cpu Speed: 16.7MHz
• No. Of Timers: 1
• Embedded Interface Type: UART
• Digital Ic Case Style: PQFP
• Supply Voltage Range: 4.75V To 5.25V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

The processor terminates the bus cycle, and remains in this state until HALT is negated.
Then the processor retries the preceding cycle using the same function codes, address,
and data (for a write operation). BERR should be negated at least one clock cycle before
HALT is negated.
3.4.3 Halt Operation
HALT
device, the processor halts and remains halted as long as the signal remains asserted, as
shown in Figure 3-26.
While the processor is halted, bus arbitration is performed as usual. Should a bus error
occur while HALT is asserted, the processor performs the retry operation previously
described.
3-26
LDS/UDS
FC2-FC0
D15–D0
A23–A1
DTACK
BERR
HALT
CLK
R/W
performs a halt/run/single-step operation. When HALT is asserted by an external
AS
S0
To guarantee that the entire read-modify-write cycle runs
correctly and that the write portion of the operation is
performed without negating the address strobe, the processor
does not retry a read-modify-write cycle. When BERR occurs
during a read-modify-write operation, a bus error operation is
performed whether or not HALT is asserted.
If a RESET instruction is executed while HALT is asserted, the
CPU will be reset.
S2
READ
Figure 3-25. Retry Bus Cycle Timing Diagram
S4
Freescale Semiconductor, Inc.
S6
For More Information On This Product,
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MC68306 USER'S MANUAL
Go to: www.freescale.com
1 CLOCK PERIOD
NOTE
NOTE
HALT
S0
S2
RETRY
S4
S6
MOTOROLA