SH7055S Datasheet, PDF (845/1002 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7000 Series

Reset
Bit rate adjustment
Bit-rate-adjustment state
Inquiry/Selection wait
Transition to
programming/
erasing state
User MAT/User boot MAT
erasing processing
Inquiry/Selection state
Inquiry
Inquiry processing
Selection
Selection
processing
Programming/Erasing state
Programming/Erasing
selection wait
Programming
Programming
processing
Erasing
Erasing processing
Check
Check processing
Figure 22.26 Boot Program Processing Flow
• Bit-rate-adjustment state
The bit rate is calculated by measuring the period of transfer of a low-level byte (H'00) from
the host. The bit rate can be changed by the command for a new bit rate selection. After the
bit rate has been adjusted, the boot program enters the inquiry/selection state. The bit-rate-
adjustment sequence is shown in figure 22.27.
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