HD64F3048VTF8 Datasheet, PDF (624/903 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip

Section 18 ROM (H8/3048F-ONE: Single Power Supply, H8/3048B Mask ROM Version)
On-Chip RAM Area Divisions in Boot Mode
In boot mode, the RAM area is divided into an area used by the boot program and an area to which
the programming control program is transferred via the SCI, as shown in figure 18.9. The boot
program area cannot be used until the execution state in boot mode switches to the programming
control program transferred from the host.
H'FFEF10
H'FFF50F
H'FFF510
Boot program area
Programming
control
program area
ID code area
(8 bytes)
H'FFFF0F
Figure 18.9 RAM Areas in Boot Mode
Note:
The boot program area cannot be used until a transition is made to the execution state for
the programming control program transferred to RAM. Note also that the boot program
remains in this area of the on-chip RAM even after control branches to the programming
control program.
In boot mode in the H8/3048F-ONE, the contents of the 8-byte ID code area shown below are
checked to determine whether the program is a programming control program compatible with the
H8/3048F-ONE.
H'FFF510
40 FE 62 66 33 30 34 38
H'FFF518 onward
(Product ID code)
Programming control program instruction codes
If an original programming control program is used in boot mode, the 8-byte ID code shown
above should be added at the beginning of the program.
Rev. 3.00 Sep 27, 2006 page 596 of 872
REJ09B0325-0300