SH7080 Datasheet, PDF (1342/1644 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 23 Flash Memory
Reset
Bit rate matching
Bit rate matching state
Wait for inquiry and
selection
Enter
programming/erasure state
Erase
user MAT/use boot MAT
Inquiry-and-selection state
Inquiry
Inquiry
processing
Selection
Selection
processing
Programming/erasure state
Wait for programming/erasure
selection
Programming
Programming
processing
Erasure
Erasure
processing
Checking
Checking
processing
Figure 23.22 Flow of Processing by the Boot Program
• Bit-rate matching state
In bit-rate matching, the boot program measures the low-level intervals in a signal carrying H'00
data that is transmitted by the host, and calculates the bit rate from this. The bit rate can be
changed by the new-bit-rate selection command. On completion of bit-rate matching, the boot
program goes to the inquiry and selection state. The sequence of processing in bit-rate matching is
shown in figure 23.23.
Rev. 3.00 May 17, 2007 Page 1284 of 1582
REJ09B0181-0300