SH7280 Datasheet, PDF (1475/1726 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine family

Section 26 Flash Memory
<User MAT>
<On-chip RAM>
Procedure for
switching to the
user boot MAT
Procedure for
switching to
the user MAT
<User boot MAT>
Procedure for switching to the user boot MAT
(1) Mask interrupts.
(2) Write H'AA to FMATS.
(3) Execute thirty-two NOP instructions before
accessing the user boot MAT.
Procedure for switching to the user MAT
(1) Mask interrupts.
(2) Write a value other than H'AA to FMATS.
(3) Execute thirty-two NOP instructions before accessing
the user MAT.
Figure 26.19 Switching between User MAT and User Boot MAT
26.7.2 Interrupts during Programming/Erasing
(1) Download of On-Chip Program
(a) VBR Setting Change
Before downloading the on-chip program, VBR must be set to H'80000000. If VBR is set to a
value other than H'80000000, the interrupt vector table is placed in the user MAT (FMATS is not
H'AA) or the user boot MAT (FMATS is H'AA) on setting H'80000000 to VBR.
When VBR setting change conflicts with interrupt occurrence, whether the vector table before or
after VBR is changed is referenced may cause an error.
Therefore, for cases where VBR setting change may conflict with interrupt occurrence, prepare a
vector table to be referenced when VBR is H'00000000 (initial value) at the start of the user MAT
or user boot MAT.
Rev. 1.00 Jun. 26, 2008 Page 1445 of 1692
REJ09B0393-0100