R5F61525 RENESAS [Renesas Technology Corp], R5F61525 Datasheet - Page 667

• Manufacturer Part Number: R5F61525
• Description: 32-Bit CISC Microcomputer H8SX Family H8SX/1500 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

17.11
It is possible to switch between the user MAT and user boot MAT. However, the following
procedure is required because the start addresses of these MATs are allocated to the same address.
Switching to the user boot MAT disables programming and erasing. Programming of the user boot
MAT should take place in boot mode or programmer mode.
1. Memory MAT switching by FMATS should always be executed from the on-chip RAM.
2. When accessing the memory MAT immediately after switching the memory MATs by
3. If an interrupt request has occurred during memory MAT switching, there is no guarantee of
4. After the memory MATs have been switched, take care because the interrupt vector table will
5. Memory sizes of the user MAT and user boot MAT are different. When accessing the user
FMATS from the on-chip RAM, similarly execute the NOP instruction in the on-chip RAM
for eight times (this prevents access to the flash memory during memory MAT switching).
which memory MAT is accessed. Always mask the maskable interrupts before switching
memory MATs. In addition, configure the system so that NMI interrupts do not occur during
memory MAT switching.
also have been switched. If interrupt processing is to be the same before and after memory
MAT switching, transfer the interrupt processing routines to the on-chip RAM and specify
VBR to place the interrupt vector table in the on-chip RAM.
boot MAT, do not access addresses which exceed the 10-kbyte memory space. If an access is
equal to or greater than 10 kbytes, the read values are undefined.
<User MAT>
Switching between User MAT and User Boot MAT
Figure 17.20 Switching between User MAT and User Boot MAT
Procedure for switching to the user boot MAT
1.
2.
3.
Procedure for switching to the user MAT
1.
2.
3.
Note: * Set the FLSHE bit in the system control register (SYSCR) to 1
Inhibit interrupts (mask).
Write H'AA to FMATS*.
Before access to the user boot MAT, execute the NOP instruction for eight times.
Inhibit interrupts (mask).
Write other than H'AA to FMATS*.
Before access to the user MAT, execute the NOP instruction for eight times.
<On-chip RAM>
when making access to FMATS.
Procedure for
switching to
user boot MAT
Procedure for
switching to
user MAT
Section 17 Flash Memory (0.18-(m F-ZTAT Version)
<User boot MAT>
Rev. 3.00 Mar. 14, 2006 Page 629 of 804
REJ09B0104-0300