MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 348

• Manufacturer Part Number: MPC555CME
• Description: KIT EVALUATION FOR MPC555
• Manufacturer: Freescale Semiconductor
• Type: Microcontrollerr

Specifications of MPC555CME

• Contents: Module Board, Installation Guide, Power Supply, Cable, Software and more
• Processor To Be Evaluated: MPC555
• Data Bus Width: 32 bit
• Interface Type: RS-232
• For Use With/related Products: MPC555
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

9.5.12 Contention Resolution on External Bus
MPC555
USER’S MANUAL
When the MPC555 / MPC556 is in slave mode, external master access to the MPC555
/ MPC556 internal bus can be terminated with relinquish and retry in order to allow a
pending internal-to-external access to be executed. The RETRY signal functions as
an output that signals the external master to release the bus ownership and retry the
access after one clock.
Figure 9-38
shows the timing when an external access is retried and a pending internal-to-external
access follows.
/
MPC556
describes the flow of an external master retried access.
EXTERNAL BUS INTERFACE
Rev. 15 October 2000
Figure 9-39
MOTOROLA
9-52