Motorola MPC533 Reference Manual page 999

– Start/complete (1 to indicate start access) -> SC
– Read/write address (starting write address of block) -> RWAD
– Read/write (1 to indicate a write access) -> RW
– Word size (32 bits, 16 bits, 8 bits) -> SZ
– Write data (write data) -> WD
– Privilege (user data/instruction, supervisor data/instruction) -> PRV
– Map select (select memory map, 00 or 01) -> MAP
– Access count (non zero number to indicate size of block access) -> CNT
3. After completion of this write operation, the device ready for upload/download
public message (TCODE = 16) is transmitted to the tool indicating that the device
is ready for next access.
4. The specified address (stored in RWAD field) is incremented to the next word size
and the number in the CNT field is decremented. The SC field is not cleared.
5. The tool transmits the next upload/download information public message (TCODE
= 19).
6. The upload/download information public message contains:
a) TCODE(19)
b) Write data (write data -> UDI)
7. After the completion of this write operation, the device ready for upload/download
public message (TCODE = 16) is transmitted to the tool indicating that the device
is ready for next access.
8. The specified address (in RWAD field) is incremented to the next word size and the
number in the CNT field is decremented. The SC field is not cleared.
9. Steps 5 through 8 are repeated until the count value in the CNT field of RWA
register equals zero. The SC bit is cleared to indicate end of the block write access.
For downloading write data to the device for block write
operation, the download request public message (TCODE =
18) should not be used to write subsequent data to the UDI
register. Data written to the UDI register (via download request
message, TCODE 18) is not used by the device for any
read/write operation.
MOTOROLA
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
NOTE
Chapter 22. READI Module
Read/Write Access
22-67