HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 532

• Manufacturer Part Number: HD6417660
• Description: Renesas 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

17.4
17.4.1
When the BOOT_E pin is asserted to its low level by a power-on reset (RESETP = low), this LSI
enters boot mode at the end of a reset. At this point, processing by this LSI would not normally
branch to the reset vector. In boot mode, processing branches to the on-chip boot program instead,
to initiate the boot function.
Because of the initial state by a reset, the CPU enters privileged mode. For details on privileged
mode, refer to section 2.1, Processing States and Processing Modes. In boot mode, which differs
from the normal privileged mode, area 0 in the external memory space is divided into the two
areas shown in figure 17.2. The area from H'00000000 to H'01FFFFFF is exclusively used for the
boot function. Access to locations in this area by the user is thus prohibited. The boot program is
placed here. The area from H'02000000 to H'03FFFFFF is an area 0 which is the same as the area
0 of the normal privileged mode.
Rev. 1.00, 02/04, page 494 of 804
H'0C000000
H'1C000000
H'1FFFFFFF
H'00000000
H'04000000
H'08000000
H'10000000
H'14000000
H'18000000
Operation
Address Space in Boot Mode
(on-chip register and
on-chip memory)
Figure 17.2 External Memory Space in Boot Mode
(Reserved)
(Reserved)
(Reserved)
(Reserved)
Area 0
Area 1
Area 2
Area 3
Area 4
Area 5
Area 6
Area 7
H'00000000
H'01000000
H'02000000
H'03000000
H'03FFFFFF
External address space
Space for mounting
(max. 16Mbytes)
Shadow space
Shadow space
Shadow space
Normal mode
Space for mounting
(max. 16Mbytes)
Shadow space
boot program
Boot mode
Area for