SH7058 Datasheet, PDF (914/1130 Pages) Renesas Technology Corp – Renesas SuperHTM RISC engine

• The start address in the user branch destination is set to the FUBRA parameter (general
register R5).
When the user branch processing is not required, 0 must be set to FUBRA.
When the user branch is executed, the branch destination is executed in flash memory
other than the one that is to be programmed. The area of the on-chip program that is
downloaded cannot be set.
The program processing must be returned from the user branch processing by the RTS
instruction.
See the description in 23.4.3 (2.2) Flash user branch address setting parameter
(FUBRA).
(2.7) Initialization
When a programming program is downloaded, the initialization program is also downloaded to
on-chip RAM. There is an entry point of the initialization program in the area from (download
start address set by FTDAR) + 32 bytes. The subroutine is called and initialization is executed
by using the following steps.
MOV.L #DLTOP+32,R1
; Set entry address to R1
JSR @R1
; Call initialization routine
NOP
• The general registers other than R0 are saved in the initialization program.
• R0 is a return value of the FPFR parameter.
• Since the stack area is used in the initialization program, a stack area of maximum 128
bytes must be reserved in RAM.
• Interrupts can be accepted during the execution of the initialization program. However,
the program storage area and stack area in on-chip RAM and register values must not
be destroyed.
(2.8) The return value of the initialization program, FPFR (general register R0) is judged.
(2.9) FKEY must be set to H'5A and the user MAT must be prepared for programming.
(2.10) The parameter which is required for programming is set.
The start address of the programming destination of the user MAT (FMPAR) is set to general
register R5. The start address of the program data storage area (FMPDR) is set to general
register R4.
• FMPAR setting
FMPAR specifies the programming destination start address. When an address other
than one in the user MAT area is specified, even if the programming program is
executed, programming is not executed and an error is returned to the return value
parameter FPFR. Since the unit is 128 bytes, the lower eight bits (MOA7 to MOA0)
must be in the 128-byte boundary of H'00 or H'80.
Rev. 3.0, 09/04, page 873 of 1086