MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 864

• 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

D.19.1.1 CHAN_CONTROL
D.19.1.2 BIT_D
D.19.1.3 HALF_PERIOD
D.19.1.4 BIT_COUNT
D.19.1.5 XFER_SIZE
D.19.1.6 SIOP_DATA
MPC555 / MPC556
USER’S MANUAL
NOTES:
This 9-bit CPU written parameter is used to setup the clock polarity for the SIOP data
transfer. The valid values for CHAN_CONTROL for this function are given in the table
below. CHAN_CONTROL must be written by the host prior to issuing the host service
request (HSR) to initialize the function.
1. Other values of CHAN_CONTROL may result in indeterminate operation.
BIT_D is a CPU written bit that determines the direction of shift of the SIOP data. If
BIT_D is zero then SIOP_DATA is right shifted (lsb first). If BIT_D is one then
SIOP_DATA is left shifted (msb first).
This CPU-written parameter defines the baud rate of the SIOP function. The value
contained in HALF_PERIOD is the number of TCR1 counts for a half SIOP clock pe-
riod (e.g., for a 50 KHz baud rate, with a TCR1 period of 240 ns, the value [(1/50 KHz)/
2]/240 ns = 42 should be written to HALF_PERIOD. The range for HALF_PERIOD is
1 to 0x8000, although the minimum value in practice will be limited by other system
conditions. See notes on use and performance of SIOP function.
This parameter is used by the TPU to count down the number bits remaining while a
transfer is in progress. During the SIOP initialization state, BIT_COUNT is loaded with
the value contained in XFER_SIZE. It is then decremented as the data is transferred
and when it reaches zero, the transfer is complete and the TPU issues an interrupt re-
quest to the CPU.
This CPU-written parameter determines the number of bits that make up a data trans-
fer. During initialization, XFER_SIZE is copied into BIT_COUNT. XFER_SIZE is
shown as a 5-bit parameter to match the maximum size of 16 bits in SIOP_DATA, al-
though the TPU uses the whole word location. For normal use, XFER_SIZE should
be in the range 1-to-16.
This parameter is the data register for all SIOP transfers. Data is shifted out of one
end of SIOP_DATA and shifted in at the other end, the shift direction being determined
CHAN_CONTROL
8 7 6 5 4 3 2 1 0
0 1 0 0 0 1 1 0 1
0 1 0 0 0 1 1 1 0
Table D-4 SIOP Function Valid CHAN_Control Options
1
TPU ROM FUNCTIONS
Rev. 15 October 2000
Data valid on clock Falling edge.
Data valid on clock Rising edge.
Resulting Action
MOTOROLA
D-50