Section 17 Flash Memory
Rev. 3.00 Sep. 27, 2007 Page 595 of 758
REJ09B0243-0300
Bit Bit
Name
Initial
Value
R/W Description
31 to 0 UA31 to
UA0
Undefined R/W
User Branch Destination Address
When the user branch is not required, address 0
(H'84000000) must be set.
The user branch destination must be an area other than
the flash memory, an area other than the RAM area in
which on-chip program has been transferred, or the
external bus space.
Note that the CPU must not branch to an area without
the execution code and get out of control. The on-chip
program download area and stack area must not be
overwritten. If CPU runaway occurs or the download
area or stack area is overwritten, the value of flash
memory cannot be guaranteed.
The download of the on-chip program, initialization,
initiation of the programming/erasing program must not
be executed in the processing of the user branch
destination. Programming or erasing cannot be
guaranteed when returning from the user branch
destination. The program data which has already been
prepared must not be programmed.
Store general registers R8 to R15. General registers R0
to R7 are available without storing them.
Moreover, the programming/erasing interface registers
must not be written to in the processing of the user
branch destination.
After the processing of the user branch has ended, the
programming/erasing program must be returned to by
using the RTS instruction.
For the execution intervals of the user branch
processing, see note 2 (User Branch Processing
Intervals) in section 17.7.2, Other Notes.
Содержание SH7124 R5F7124
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